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Acilius sinensis Peschet, 1915 (Figs 1–29) Material examined. CHINA: YUNNAN: 2 Ô 2 ♀, 3 instar I, 4 instar II and 1 instar III larvae, Baoshan Prefecture, Tengchong County, Gaoligong Mts NNR, Dahaoping vill., 24°58.6’N 98°43.8’E, 2000 m, deep pool along road, 5.vii.2016, J. Hájek & J. Růžička leg. (NMPC, YALC, ZSMG); 1 Ô 1 ♀, Dehong Prefecture, Yingjiang County, ca. 25.09°N 98.23°E, 2000 m, 14.iv.2020, Zhao-Wei Guo leg. (SYSU); 1 ♀, Dehong Prefecture, Yingjiang [County], iv.2021, Mang Yun [leg.] (ZSMG). 1 ♀, Diqing Tibetan Autonomous Prefecture, Shangri-La County, Haba Snow Mountain (ȒUḦƜ), 20.v.2020, Wang Peng leg. (SYSU). Larval morphology General morphological characteristics of the larvae of Acilius (adapted from Alarie et al. 2011, 2023): Larvae of Acilius can readily be distinguished from those of other genera of Aciliini described in detail (i.e., Graphoderus, Sandracottus, Thermonectus) by the following combination of characters: primary pore MNa inserted at approximately the same level as pore MNb (Fig. 10), presence of less than 19 additional spiniform setae on the dorsal surface of stipes (instar I) (Fig. 8), all maxillary palpomeres with abundant spinulae (instar I) (Fig. 8), median process of prementum Y-shaped, bifid from the base (Figs 11–12), and presence of 13–23 anteroventral additional natatory setae on femur (instar I) (Fig. 13) (Table 2). Description, instar I (Figs 1–2, 4–17) Color: Body predominantly creamy white to pale yellow; head capsule yellow, creamy white around ocularium; head appendages creamy white except A4, apex of A3, MP3 and LP2 piceous; thoracic terga and legs pale yellow; abdominal terga pale yellow except segment VIII with black band mesally at about mid-length, gradually broadening towards apex; urogomphi black. Body: Subcylindrical, bent at first abdominal segment, gibbous in lateral view (Figs 1–2). Measurements and ratios aimed to characterize body shape as in Table 1. Head (Figs 4–12): Head capsule (Figs 4–5) flattened, subtriangular, longer than broad; maximum width at stemmata, constricted at level of occipital region; occipital suture absent, ecdysial line well marked; occipital foramen deeply emarginate both dorsally and ventrally; epicranial plates meeting ventrally, posterior tentorial pits visible ventrally on central region; surface covered with small scale-like microsculptures; frontoclypeus subtriangular, apical margin rounded medially, with one spine-like egg burster on each lateral side; anterolateral lobes (= adnasalia) rounded, not projecting beyond apical margin; six rounded dorsolateral stemmata at each side, stemmata protruding a short distance from head surface, two anterodorsal ones strongly developed. Antenna (Figs 6–7) short, robust, four-segmented, half as long as HW; A1 and A2 subequal in length; A3 longest, with a strongly developed ventroapical spinula; A4 shortest, with lateroventral process at mid-length, similar to that of A3; A3’ not protruding; A1–A3 covered with short spine-like spinulae. Mandible (Fig. 10) prominent, falciform, wide at base, sharp apically, with short spine-like spinulae along baso-external margin and short-hair-like spinulae distally along inner margin; mandibular channel present, inner margin slightly toothed ventrally. Maxilla (Figs 8–9) with cardo well developed; stipes strongly developed, subtrapezoidal, antero-internal angle projecting inwards, internal margin with short spinulae; palpifer very short, broad, incompletely sclerotized; palpus short, robust, three-segmented, MP1 shortest, MP3 longest, with lateroventral subapical process similar to those of antenna; palpomeres covered with scattered minute spinulae; galea well developed, spiniform, subconical, slightly curved inwards, surface covered with scattered minute spinulae. Labium (Figs 11–12) with prementum subtrapezoidal, somewhat pear-like, longer than broad, anterodorsal margin rounded, projecting forward into Y-shaped median process, deeply indented apically; dorsal surface of prementum densely covered with either minute (apical half) or elongate (basal half) spine-like spinulae; labial palpus short, robust, two-segmented, palpomeres subequal in length, with strong spine-like spinulae along external margin. Thorax (Figs 13–14): Terga convex, pronotum about as long as meso- and metanotum combined, meso- and metanotum subequal; protergite subrectangular, margins truncated, more developed than meso- and metatergite; meso- and metatergite transverse, with anterotransverse carina; sagittal line well marked; venter membranous; spiracles absent. Legs (Figs 13–14) long, composed of six articles; L2 longest, slightly longer than subequal L1 and L3; CO robust, elongate, TR divided into two parts by an annulus, FE, TI and TA slender, subcylindrical, PT with two long, slender, almost straight claws, posterior claw shorter than anterior one; leg articles densely covered with minute spine-like spinulae (not represented); protarsus with a row of well-developed spinulae along ventral margin on distal half. Abdomen (Figs 15–17): Eight-segmented, segments I–VI sclerotized dorsally, membranous ventrally; segments III–V widest, remaining segments progressively narrowing to apex; tergites I–VI similar to each other, narrow, transverse, laterally rounded, with anterotransverse carina, sagittal line present on anterior third; segment VII somewhat longer, completely sclerotized except of narrow sagittal line ventrally, without anterotransverse carina; spiracles absent on segments I–VII; LAS (Figs 15–16) longest, completely sclerotized, ring-like, without anterotransverse carina, covered with short spinulae (not represented); siphon reduced. Urogomphus (Fig. 17) short, one-segmented, covered with short spinulae (not represented). Chaetotaxy (Figs 4–17): Similar to that of generalized Dytiscinae larvae (Alarie et al. 2011) except for following characteristics: frontoclypeus with large number of well-developed lamellae clypeales arranged in three/ four mixed rows; more dorsal setae often smaller, digitiform, more ventral setae with more or less well-impressed apical notches; parietal with pores PAl and PAm absent; maxilla with seta MX 6 absent; stipes with 14–19 elongate and spine-like additional setae on dorsal surface (Fig. 8); maxillary palpomere III with presence of two very small additional setae (Figs 8–9); prementum with two additional spiniform setae on each side of median process (Fig. 11); legs (Figs 13–14) with pores TAc, TAd, TAe, and TAf and setae TR2, FE4, FE5, PT1 and PT2 absent; seta TI4 elongate and hair-like; seta TI5 hair-like (difficult to see owing to presence of several additional setae); femora with additional hair-like natatory setae along anteroventral and posterodorsal margins, and 3–5 anterodistal spine-like setae (Table 2): tibiae with additional hair-like natatory setae along anteroventral and posterodorsal margins and 0–2 anterodistal spine-like setae (Table 2); LAS (Figs 15–16) with pore ABc absent; additional pore sporadically present dorsally; lateral margin with large number of additional natatory setae. Description, instar II (Figs 3, 18–22) As for instar I except as follows: Color: Body predominantly yellow to pale brown (Fig. 3); head capsule yellow, brownish mesally; thoracic terga pale brown, darker mesally; femora broadly piceous proximally; abdominal terga I–VII pale brown, darker mesally; abdominal segment VIII creamy white anteriorly becoming dark brown to black posteriorly. Body: Measurements and ratios aimed to characterize body shape as in Table 1. Head (Figs 18–20): Head capsule: surface spinulae absent except mesally, over occipital region. Antenna: A4/ A3 = 0.21–0.22; Maxilla: PPF/MP1 = 0.19–0.29; GA/MP1 = 2.00–2.05; MP/LP = 0.51–0.53; LP2/LP1 = 0.69–0.84; antennomeres, maxillary palpomeres and mandible lacking spinulae. Thorax (Figs 21–22): single ventral sclerite present on prothorax. Legs (Figs 21–22): L3/HW = 2.90–3.08; surface spinulae lacking; marginal ventral spine-like spinulae along distal half of all tarsi. Abdomen: segment VII completely sclerotized, ring-like, with anterotransverse carina; LAS and U without spinulae. Chaetotaxy (Figs 18–22): Dorsal surface of head capsule with numerous short secondary setae; ventral surface of parietale with 12–15 spiniform setae laterally and 4–7 mesally (Fig. 18); antennomere I with minute secondary setae dorsally (as in Fig. 24); mandible with a row of elongate secondary hair-like setae along basoexternal margin (Fig. 19); maxillary stipes with a row of 31–34 elongate spine-like setae dorsally (including both additional and secondary), and a row of secondary hair-like setae along dorsoexternal margin (Fig. 20); secondary leg setation detailed in Table 3;rows of secondary natatory setae present along posterodorsal margin and basal half of anteroventral margin of tarsi; posterior surface of femora and tibiae with linear row of minute secondary pores below rows of natatory setae (not represented); abdominal segment VII with row of natatory setae on lateral margin; LAS with secondary hair-like setae dorsally and numerous secondary spine-like setae ventrally. Description, instar III (Figs 23–27) As for instar II except as follows: Color: Body predominantly dark yellow broadly brownish mesally; head capsule dark brown mesally. Body: Measurements and ratios aimed to characterize body shape as in Table 1. Head (Figs 23–25): Antenna (Fig. 23): A1/A3 = 2.00; A2/A3 = 1.09; A2 and A3 secondarily subdivided. Maxilla (Fig. 24): MP3 secondarily subdivided; MP3/MP2 = 1.18; GA/MP1 = 1.45. Thorax (Figs 26–27): Spiracles present on mesothorax. Legs (Figs 26–27): L3/HW = 3.45. Abdomen: Sagittal line and spiracles present on segments I–VII. Chaetotaxy (Figs 23–27): Parietal with several secondary spine-like setae laterally and ventrally (Fig. 23); mandible with larger number of minute secondary setae distally; secondary leg setation detailed in Table 3 (Figs 26–27). Habitat and collecting circumstances. Larvae and adults of Acilius sinensis from Dahaoping were collected together in a flooded ditch near the village (Fig. 30) The ditch was shady, rather deep (depth ca. 0.5 m), without any submerged vegetation, bottom was muddy with layer of decaying leaves; the ditch was frequently visited by domestic ducks from the nearby homestead; the only other dytiscid species occurring at the habitat was Laccophilus kempi holmeni Brancucci, 1983. A single female from Haba Xueshan (Figs 28–29) was collected in a mountain lake. Distribution. Mountainous areas (ca. 1700–2000 m a.s.l.) of Sichuan and Yunnan provinces, China. The only record from Sichuan is imprecisely localized type specimens; historical records from Yunnan came from north-east part of the province, recent findings are all from western Yunnan (Fig. 31)., Published as part of Alarie, Yves, Mai, Zuqi, Michat, Mariano C. & Hájek, Jiří, 2023, Larval morphology and new records of the iconic diving beetle Acilius sinensis Peschet, 1915 (Coleoptera: Dytiscidae: Dytiscinae) - a species well established in western Yunnan, China, pp. 277-291 in Zootaxa 5301 (2) on pages 279-287, DOI: 10.11646/zootaxa.5301.2.8, http://zenodo.org/record/8066221, {"references":["Peschet, R. (1915) Description d'un Acilius nouveau de Chine (Col. Dytiscidae). Bulletin de la Societe Entomologique de France, 1915, 288 - 290. https: // doi. org / 10.3406 / bsef. 1915.25829","Alarie, Y., Michat, M. C. & Miller, K. B. (2011) Notation of primary setae and pores on larvae of Dytiscinae (Coleoptera: Dytiscidae), with phylogenetic considerations. Zootaxa, 3087 (1), 1 - 55. https: // doi. org / 10.11646 / zootaxa. 3087.1.1","Brancucci, M. (1983) Revision des especes est-palearctiques, orientales et australiennes du genre Laccophilus (Col. Dytiscidae). Entomologische Arbeiten aus dem Museum G. Frey, 31 / 32, 241 - 426."]}

Alarie, Yves, Mai, Zuqi, Michat, Mariano C., Hájek, Jiří (2023): Larval morphology and new records of the iconic diving beetle Acilius sinensis Peschet, 1915 (Coleoptera: Dytiscidae: Dytiscinae)-a species well established in western Yunnan, China. Zootaxa 5301 (2): 277-291, DOI: 10.11646/zootaxa.5301.2.8, URL: http://dx.doi.org/10.11646/zootaxa.5301.2.8

Platynectes owaraha sp. nov. (Figs 6, 14) Platynectes insularis J. Balfour-Browne, 1939: 466 (partim). Platynectes semperi Régimbart, 1899: GUḖORGUIEV (1972): 53 (partim). Type locality. Solomon Islands, Owaraha. Type material. HOLOTYPE: J (BMNH), labelled: ‘Para- / type [p, round label with yellow frame] // British Solomons [p] / … [illegible] 193 [p] 2 [hw] / R.J.A.W.Lewer [p] / [on reverse:] Santa Ana [hw] // Pres.by / Imp.Inst.Ent. / B.M.1936-90. [p] // Platynectes / insularis m. [hw] / J.Balfour-Browne det. [p] // HOLOTYPE J / PLATYNECTES / owaraha sp. nov. / J. Hájek et al. det. 2021 [p, red label]’. PARATYPE: 1 ♀, labelled: ‘Para- / type [p, round label with yellow frame] // with stream [hw] British Solomons [p] / … [illegible] 193 [p] 2 [hw] / R.J.A.W.Lewer [p] / [on reverse:] Santa / Ana [hw] // Pres.by / Imp.Inst.Ent. / B.M.1936-90. [p] // Platynectes / insularis m. [hw] / J.Balfour-Browne det. [p]’ (BMNH). The paratype with the respective red printed label. Additional material studied. 1 J (immature specimen without left elytron): San Cristoval [Makira], Pagato R. [River], camp 2 [ca. 10°34.9′S, 162°02.7′E], rocks in midstream, 3.viii.[19]65, Roy. Soc. Exped. (BMNH). Description. Male holotype. Habitus. Broadest in one third of elytral length; body outline continuous. Colouration (Fig. 6). Head along anterior margin anteriorly from eyes orange-brown, with round orange spot between eyes and two transverse spots on vertex; appendages orange-brown. Pronotum with broadly orange-brown sides and anterior corners; basal margin and disc of pronotum somewhat brownish translucent. Scutellum black, brownish translucent. Elytron black with brownish lateral margin and epipleura, disc with distinct yellow-orange pattern consisting of, one postmedial spot in two thirds of elytral length, one subapical spot and band along lateral margin; postmedial spot transverse, somewhat divided longitudinally to two parts, connected with longitudinal lateral band; preapical spot large, connected with longitudinal lateral band; lateral longitudinal band broad and distinct, starting at about elytral midlength and ending close to apex. Legs orange-brown. Ventral surface with brown head, prosternum, mesoventrite and lateral parts of metaventrite; medial part of metaventrite, metacoxal plates and abdominal ventrites darker, brown-blackish; apical ventrite orange-brown medio-posteriorly. Head ca. 0.65× width of pronotum, transversely elliptical. Meshes of reticulation mostly complete (not closed); reticulation absent anteriorly on clypeus. Microreticulation absent. Pronotum. Reticulation similar to that of head, consisting of heterogeneous polygonal meshes; meshes smaller, incomplete and less impressed on disc, becoming larger, closed and deeply impressed near sides. Microreticulation absent. Centre of pronotal disc with small longitudinal furrow. Elytra. Punctation double; coarse punctures present in two discal and two lateral longitudinal lines; fine punctures occurring mostly on lines of reticulation. Reticulation similar to that of head and pronotum but slightly less impressed, consisting of heterogeneous polygonal meshes; meshes often incomplete. Traces of microreticulation hardly perceptible in apical third of elytra. Ventral surface. Medial part of metaventrite without microsculpture, shiny, with sparse fine punctation. Ratio WC/WS = 4.50. Metacoxal lines incomplete anteriorly, slightly divergent. Metacoxal plates reticulated with polygonal meshes; surface with short longitudinal strioles; punctation consisting of sparse fine punctures. Abdominal ventrites with bunch of coarse setigerous punctures present in centre of ventrites III–V, additional setigerous punctures arranged sparsely in transverse line in medial part of ventrites. Male genitalia. Median lobe (Fig. 14a) in lateral aspect slender in median part, only slightly widened to apex; apex broadly rounded, distinctly setose on ventral side. Parameres (Fig. 14b) narrowly triangular, slender, incised basally; dorsal surface densely setated; apical lobe long. Female. Identical to male in habitus. Elytral reticulation slightly more impressed, traces of microreticulation better perceptible. Measurements. TL: 5.6–5.9 mm; holotype: 5.6 mm. TL-h: 5.0– 5.4 mm; holotype: 5.05 mm. MW: 3.0– 3.1 mm; holotype: 3.0 mm. Variability. No substantial variability can be seen in the limited material available for the study. Differential diagnosis. Smallest (5.6–5.9 mm) of all Platynectes from Solomon Islands. Platynectes owaraha sp. nov. differs from similar and sympatric P. makira sp. nov. in more parallel-sided habitus; reticulation of pronotum well developed also on centre of disc; in different elytral colouration comprising only one postmedian and one subapical spot, and broad lateral longitudinal band which is beginning at about elytral midlength (cf. Figs 3 and 6); and in male median lobe, which is slightly widened to broadly rounded apex in lateral view (Fig. 14). Two specimens of P. owaraha sp. nov. from Santa Ana (Owaraha) were part of the type series of P. insularis occurring in Vanuatu. Indeed, with small body length, and with elytral pattern, P. owaraha sp. nov. resembles the latter species. However, P. owaraha sp. nov. differs from P. insularis in more parallel-sided, dorsally more convex habitus; much broader beading of lateral sides of pronotum; elytral reticulation less impressed with meshes much more frequently incomplete (not closed); longitudinal lines of serial punctures on elytra more distinct; and prosternal column broadly convex. Etymology. The new species is named after its area of occurrence – Owaraha Island, also known as Santa Ana. The specific epithet is a noun in the nominative singular, standing in apposition. Collecting circumstances. Based on the label data, the specimens were collected in streams. Probably a lowland species; the highest point of Owaraha reaches altitude 150 m a.s.l., the single specimen from Makira was collected at altitude about 40 m a.s.l. Distribution. The new species is known from small island Owaraha and nearby Makira Island (Fig. 25A).

Platynectes owaraha sp. nov. (Figs 6, 14) Platynectes insularis J. Balfour-Browne, 1939: 466 (partim). Platynectes semperi Régimbart, 1899: GUḖORGUIEV (1972): 53 (partim). Type locality. Solomon Islands, Owaraha. Type material. HOLOTYPE: J (BMNH), labelled: ‘Para- / type [p, round label with yellow frame] // British Solomons [p] / … [illegible] 193 [p] 2 [hw] / R.J.A.W.Lewer [p] / [on reverse:] Santa Ana [hw] // Pres.by / Imp.Inst.Ent. / B.M.1936-90. [p] // Platynectes / insularis m. [hw] / J.Balfour-Browne det. [p] // HOLOTYPE J / PLATYNECTES / owaraha sp. nov. / J. Hájek et al. det. 2021 [p, red label]’. PARATYPE: 1 ♀, labelled: ‘Para- / type [p, round label with yellow frame] // with stream [hw] British Solomons [p] / … [illegible] 193 [p] 2 [hw] / R.J.A.W.Lewer [p] / [on reverse:] Santa / Ana [hw] // Pres.by / Imp.Inst.Ent. / B.M.1936-90. [p] // Platynectes / insularis m. [hw] / J.Balfour-Browne det. [p]’ (BMNH). The paratype with the respective red printed label. Additional material studied. 1 J (immature specimen without left elytron): San Cristoval [Makira], Pagato R. [River], camp 2 [ca. 10°34.9′S, 162°02.7′E], rocks in midstream, 3.viii.[19]65, Roy. Soc. Exped. (BMNH). Description. Male holotype. Habitus. Broadest in one third of elytral length; body outline continuous. Colouration (Fig. 6). Head along anterior margin anteriorly from eyes orange-brown, with round orange spot between eyes and two transverse spots on vertex; appendages orange-brown. Pronotum with broadly orange-brown sides and anterior corners; basal margin and disc of pronotum somewhat brownish translucent. Scutellum black, brownish translucent. Elytron black with brownish lateral margin and epipleura, disc with distinct yellow-orange pattern consisting of, one postmedial spot in two thirds of elytral length, one subapical spot and band along lateral margin; postmedial spot transverse, somewhat divided longitudinally to two parts, connected with longitudinal lateral band; preapical spot large, connected with longitudinal lateral band; lateral longitudinal band broad and distinct, starting at about elytral midlength and ending close to apex. Legs orange-brown. Ventral surface with brown head, prosternum, mesoventrite and lateral parts of metaventrite; medial part of metaventrite, metacoxal plates and abdominal ventrites darker, brown-blackish; apical ventrite orange-brown medio-posteriorly. Head ca. 0.65× width of pronotum, transversely elliptical. Meshes of reticulation mostly complete (not closed); reticulation absent anteriorly on clypeus. Microreticulation absent. Pronotum. Reticulation similar to that of head, consisting of heterogeneous polygonal meshes; meshes smaller, incomplete and less impressed on disc, becoming larger, closed and deeply impressed near sides. Microreticulation absent. Centre of pronotal disc with small longitudinal furrow. Elytra. Punctation double; coarse punctures present in two discal and two lateral longitudinal lines; fine punctures occurring mostly on lines of reticulation. Reticulation similar to that of head and pronotum but slightly less impressed, consisting of heterogeneous polygonal meshes; meshes often incomplete. Traces of microreticulation hardly perceptible in apical third of elytra. Ventral surface. Medial part of metaventrite without microsculpture, shiny, with sparse fine punctation. Ratio WC/WS = 4.50. Metacoxal lines incomplete anteriorly, slightly divergent. Metacoxal plates reticulated with polygonal meshes; surface with short longitudinal strioles; punctation consisting of sparse fine punctures. Abdominal ventrites with bunch of coarse setigerous punctures present in centre of ventrites III–V, additional setigerous punctures arranged sparsely in transverse line in medial part of ventrites. Male genitalia. Median lobe (Fig. 14a) in lateral aspect slender in median part, only slightly widened to apex; apex broadly rounded, distinctly setose on ventral side. Parameres (Fig. 14b) narrowly triangular, slender, incised basally; dorsal surface densely setated; apical lobe long. Female. Identical to male in habitus. Elytral reticulation slightly more impressed, traces of microreticulation better perceptible. Measurements. TL: 5.6–5.9 mm; holotype: 5.6 mm. TL-h: 5.0– 5.4 mm; holotype: 5.05 mm. MW: 3.0– 3.1 mm; holotype: 3.0 mm. Variability. No substantial variability can be seen in the limited material available for the study. Differential diagnosis. Smallest (5.6–5.9 mm) of all Platynectes from Solomon Islands. Platynectes owaraha sp. nov. differs from similar and sympatric P. makira sp. nov. in more parallel-sided habitus; reticulation of pronotum well developed also on centre of disc; in different elytral colouration comprising only one postmedian and one subapical spot, and broad lateral longitudinal band which is beginning at about elytral midlength (cf. Figs 3 and 6); and in male median lobe, which is slightly widened to broadly rounded apex in lateral view (Fig. 14). Two specimens of P. owaraha sp. nov. from Santa Ana (Owaraha) were part of the type series of P. insularis occurring in Vanuatu. Indeed, with small body length, and with elytral pattern, P. owaraha sp. nov. resembles the latter species. However, P. owaraha sp. nov. differs from P. insularis in more parallel-sided, dorsally more convex habitus; much broader beading of lateral sides of pronotum; elytral reticulation less impressed with meshes much more frequently incomplete (not closed); longitudinal lines of serial punctures on elytra more distinct; and prosternal column broadly convex. Etymology. The new species is named after its area of occurrence – Owaraha Island, also known as Santa Ana. The specific epithet is a noun in the nominative singular, standing in apposition. Collecting circumstances. Based on the label data, the specimens were collected in streams. Probably a lowland species; the highest point of Owaraha reaches altitude 150 m a.s.l., the single specimen from Makira was collected at altitude about 40 m a.s.l. Distribution. The new species is known from small island Owaraha and nearby Makira Island (Fig. 25A)., Published as part of Hájek, Jiří, Šťastný, Jaroslav, Hendrich, Lars & Balke, Michael, 2023, A review of the genus Platynectes from the Solomon Islands (Coleoptera: Dytiscidae: Agabinae), pp. 57-74 in Acta Entomologica Musei Nationalis Pragae 63 (1) on pages 67-68, DOI: 10.37520/aemnp.2023.002, http://zenodo.org/record/7887309, {"references":["BALFOUR-BROWNE J. 1939: On the aquatic Coleoptera of the New Hebrides and Banks Islands. Dytiscidae, Gyrinidae, and Palpicornia. Annals and Magazine of Natural History, Series 11 3: 459 - 479.","REGIMBART M. 1899: Revision des Dytiscidae de la region Indo-Sino-Malaise. Annales de la Societe Entomologique de France 68: 186 - 367."]}

Platynectes mbaole sp. nov. (Figs 5, 12–13) Type locality. Solomon Islands, Guadalcanal, 0.5 km N of Mbaole, ca. 09°37.69′S 160°06.69′E. Type material. HOLOTYPE: J (ZSMG), labelled:ʻSalomonen:C-Guadalcanal, / 0.5 km N Mbaole, 2799 feet / S 09°37.69 E 160°06.69E / 2007 K. Mailautoka leg. [p] // HOLOTYPE J / PLATYNECTES / mbaole sp. nov. / J. Hájek et al. det. 2021 [p, red label]’. PARATYPES: 7 JJ 2 ♀♀, same label data as holotype, one specimen with additional label: ‘DNA / M. Balke / 2910’ [p, green label] (JSCL, NMPC, ZSMG); 4JJ, labelled: ʻSOLOMON IS. / Guadalcanal [p] / 4724 [on side] Sutakiki R./ 5/4.[hw] 196 [p] 3. / 2,000’ [hw] / P.GREENSLADE [p] // SOLOMON IS: [red underlined] / Pres./ P.J.M.Greenslade. / B.M.1966-477 [p]’ (BMNH, NMPC); 1 J 1 ♀, labelled: ʻSOLOMON IS.: [red underlined] / Guadalcanal Is. / Suta [ca. 9°41.5′S, 160°06.7′E] / 27.vi.1956 [p] // E.S.Brown / B.M.1957- 201 [p]’ (BMNH).All paratypes with the respective red printed label. Description. Male holotype. Habitus. Broadest in one third of elytral length; body outline continuous. Colouration (Fig. 5). Head with orange-brown clypeus and two small spots on vertex; appendages orange-brown. Pronotum with narrowly orange-brown sides and orange anterior corners; basal margin somewhat reddish translucent. Elytron black, disc with distinct yellowish pattern consisting of small basal spot in humeral area, subbasal spot, postmedial spot in two thirds of elytral length, two subapical spots and thin sublateral longitudinal line in apical half of elytra; humeral spot not connected with basal margin; subbasal spot round, situated approximately in two thirds of distance from suture to lateral margin; postmedial spot transverse, in centre narrowed, connected to sublateral line; subapical spots longitudinally elongate; sublateral line badly perceptible/interrupted in apical fifth of elytral length. Legs orange-brown, posterior legs somewhat darker than anterior two pairs. Ventral surface brown-blackish, prosternum and metacoxal processes brown. Head ca. 0.63× width of pronotum, transversely elliptical. Meshes of reticulation mostly incomplete (not closed). Pronotum. Reticulation similar to that of head; meshes somewhat larger and elongate, more often incomplete and less impressed on disc, becoming smaller, closed and deeply impressed near sides. Traces of microreticulation perceptible laterally close to sides. Centre of pronotal disc with small longitudinal furrow. Elytra. Punctation double; coarse punctures present in two discal and two lateral, relatively distinct longitudinal lines; fine punctures occurring mostly on lines of reticulation. Reticulation similar to that of head and pronotum, consisting of heterogeneous polygonal meshes; meshes often elongate and incomplete. Microreticulation absent. Ventral surface. Medial part of metaventrite with rather dense fine punctation. Ratio WC/WS = 4.7. Metacoxal lines incomplete anteriorly, slightly diverging. Metacoxal plates reticulated with polygonal meshes, punctation consisting of sparse fine punctures; plates with short longitudinal strioles. Abdominal ventrites with bunch of coarse setigerous punctures present in centre of ventrites III–V, additional setigerous punctures arranged sparsely in transverse line in medial part of ventrites. Male genitalia. Median lobe (Fig. 12a) in lateral aspect slender medially, strongly broadened to prominent apex; apex setose on apico-ventrally. Parameres (Fig. 12b) narrowly triangular, slender, incised basally; dorsal surface densely setated; apical lobe long. Female. Identical to male in habitus. Reticulation of dorsal surface more impressed, thus beetle appearing submatt; meshes on elytra less elongate, mostly closed. Measurements. TL: 6.5–7.2 mm (mean value: 6.85 ± 0.15 mm); holotype: 6.9 mm. TL-h: 5.8–6.4 mm (mean value: 6.10 ± 0.15 mm); holotype: 6.1 mm. MW: 3.7–4.0 mm (mean value: 3.80 ± 0.10 mm); holotype: 3.8 mm. Variability. The variability among the specimens of the type series can be seen only in shape and size of yellow markings: the humeral spot may absent completely and the subbasal spot is very small in some specimens, whereas additional two short longitudinal lines present posterior to elytral midlength close to suture in other specimen; sublateral longitudinal line in apical half of elytra may be complete. Differential diagnosis. The new species can be recognized from all other Platynectes from the Solomon Islands by combination of large body size, distinctive dorsal surface pattern (Fig. 5) and the shape of male genitalia with prominent apex of the median lobe (Figs 12–13). Etymology. The new species is named after its area of occurrence – Mbaole village, in the vicinity of which the new species was collected. The specific epithet is a noun in the nominative singular, standing in apposition. Collecting circumstances. Unknown. Distribution. The new species is known from medium altitude area (ca. 840 m) in north-central Guadalcanal (Fig. 25A).

Copelatus zimmermanni Gschwendtner, 1934 (Figs 27, 69–70) Copelatus zimmermanni Gschwendtner in Zimmermann, 1934: 143. Type locality. “ China (Hangchow)” [China, Zhejiang Province, Hangzhou, ca. 30°16′N 120°09′E]. Type material. Holotype ♀, originally deposited in Yenching University, Beijing, China; destroyed during fire in 1980’. Material examined. CHINA: Guangdong: 3 ♂, 4 ♀, Danxiashan Mts., 23.v.2008, F. Jia leg. (SYSU); 9 spec., 30 km NE Shaoguan, Duanshi vill., Danxiashan NP, 25°02.7′N 113°43.8′E, 125 m, pool, 4.-5.v.2011, J. Hájek leg. (NMPC); 1 ♂, Danxiashan Mts., Yangyuanshan, 10.vi.2011, F. Jia leg. (SYSU). Diagnosis. Medium sized (TL: 5.4–5.7 mm), oblong-oval species; dorsal surface distinctly convex. Head reddish, with dark band along eyes and infuscation on frons between eyes; pronotum reddish brown, laterally broadly testaceous; elytra brown, with very broad, irregularly shaped, transverse basal orange band. Pronotum with few short longitudinal strioles laterally. Each elytron with 11 superficially impressed discal striae: sutural stria usually strongly reduced to few short strioles, or almost absent in some specimens; all striae abbreviated posteriorly, striae 2, 3, 5, 7 and 9 ending in posterior fourth of elytral length, striae 4, 6, 8 and 11 reaching apical fourth of elytral length; striae 7 and 9 often fragmented to strioles throughout their length (Fig. 27). Median lobe broad, club-shaped, with two protuberances on dorsal side, sinuate on ventral margin; apex beak-shaped (Fig. 69). Paramere slender ‘C’-shaped; apex slender; apical lobe long, club-shaped (Fig 70). Female similar to male; strioles on pronotum more numerous, elytral striae more impressed. Collection details. The specimens from Danxiashan were collected in shallow open pool with sparse littoral vegetation, and in a pool on a stream (Fig. 78). Distribution. A species described from Zhejiang (China), and subsequently recorded also from Japan and Korea (Satô 1985, Park et al. 2008). First record from Guangdong province (Fig. 83)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 275-276, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Zimmermann, A. (1934) Monographie der palaarktischen Dytisciden. V. Colymbetinae (1. Teil). (Copelatini, Agabini: Gattung Gaurodytes Thoms.). Koleopterologische Rundschau, 20, 138 - 214.","Sato, M. (1985) The genus Copelatus of Japan (Coleoptera: Dytiscidae). Transactions of the Shikoku Entomological Society, 17, 57 - 67.","Park, H. C., Lee, Y. B. & Lee, H. A. (2008) Taxonomic review of the genus Copelatus Erichson (Coleoptera: Dytiscidae) in Korea. Entomological Research, 38 (1), 73 - 76. https: // doi. org / 10.1111 / j. 1748 - 5967.2008.00134. x"]}

Copelatus weymarni J. Balfour-Browne, 1947 (Figs 25, 62–66) Copelatus weymarni J. Balfour-Browne, 1947: 440; Zeng 1989: 6 (Shanghai); Li 1992: 35 (Liaoning); Nilsson 1995: 42 (Hebei: Beidaihe). Type locality. “Manchuria: Djalantun” [China, Nei Mongol, Zalantun, ca. 48°00′N 122°44′E]. Type material. Holotype ♂, deposited in BMNH (not studied). Material examined. CHINA: Liaoning: 1 ♂, 92 km SE Benxi, 200 m, 29.ix.1994, Ji & Wang leg. (NHMW); Shanghai: 6 spec., Shanghai (IZCAS). Diagnosis. Medium sized (TL: 5.1–5.5 mm), oblong-oval species. Head reddish-brown, clypeus somewhat paler – testaceous; pronotum reddish-brown with broadly testaceous anterior margin and lateral sides; elytra dark brown, basal margin and especially lateral sides paler – testaceous. Pronotum with short longitudinal strioles laterally. Each elytron with six complete discal striae and one submarginal stria: all striae beginning at base and ending close to apex, only stria 6 shorter and ending at apical fourth; submarginal stria long, beginning at about elytral mid-length (Fig. 25). Median lobe of aedeagus in lateral view sickle-shaped with apex slightly turned dorsally, with large irregular process on dorsal side near mid-length (Fig. 65). Parameres moderately broad, ‘C’-shaped; apex rather slender; apical lobe long, club-shaped (Fig. 66). Female similar to male, strioles on pronotum more numerous. Distribution. A species described from Inner Mongolia (not Heilongjiang, as stated by Nilsson 1995), and subsequently recorded also from Hebei, Shanghai and Liaoning in northeastern China (Zeng 1989, Li 1992, Nilsson 1995) (Fig. 83). In addition to China, C. weymarni occurs in the Far East of Russia, Japan and Korea (Satô 1985, Nilsson 1995, Park et al. 2008)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on page 274, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Balfour-Browne, J. (1947) The aquatic Coleoptera of Manchuria (Weymarn collection). The Annals and Magazine of Natural History, Eleventh Series, 13 (1946), 433 - 460. https: // doi. org / 10.1080 / 00222934608654567","Zeng, H. (1989) Classification of Dytiscidae (Insecta: Coleoptera) - A study of the collections of Dytiscidae from major museums in China. Unpublished PhD Thesis, Department of Biology, University of Sun Yat-sen University, Guangzhou, 152 pp. [in Chinese with English abstract]","Li, J. (1992) The Coleoptera Fauna of Northeast China. Jilin Education Publishing House, Jilin, 205 pp.","Nilsson, A. N. (1995) Noteridae and Dytiscidae: Annotated check list of the Noteridae and Dytiscidae of China (Coleoptera). In: Jach, M. A. & Ji, L. (Eds.), Water beetles of China. Vol. I. Zoologisch-Botanische Gesellschaft in Osterreich and Wiener Coleopterologenverein, Wien, pp. 35 - 96.","Sato, M. (1985) The genus Copelatus of Japan (Coleoptera: Dytiscidae). Transactions of the Shikoku Entomological Society, 17, 57 - 67.","Park, H. C., Lee, Y. B. & Lee, H. A. (2008) Taxonomic review of the genus Copelatus Erichson (Coleoptera: Dytiscidae) in Korea. Entomological Research, 38 (1), 73 - 76. https: // doi. org / 10.1111 / j. 1748 - 5967.2008.00134. x"]}

Copelatus tenebrosus Régimbart, 1880 (Figs 22, 61–62) Copelatus tenebrosus Régimbart, 1880: 210. For full list of synonyms, see Nilsson & Hájek (2022a: 61); Zimmermann 1927: 32 (Yunnan); Feng 1933: 326 (Fujian: Amoy); Jäch & Easton 1998: 44 (Macao: Friendship Monument). Type locality. “Solok, district of Rawas and Soeroelangoen” [Indonesia, Sumatra Island]. Type material. Syntypes deposited in Naturalis Biodiversity Center [former Rijksmuseum van Natuurlijke Historie], Leiden, Netherlands (not studied). Material examined. CHINA: Guangdong: 3 ♂, 1 ♀, Zhuhai, Hengqin Island, 10.vii.2006, F. Jia leg. (SYSU); 3 ♂, Zhuhai, Qi’ao Island, 13.-15.vii.2005, Y. Jia leg. (SYSU). Macao: 1 ♂, Cotai Ecological Zone, 4.-5.iv.2013, F. Jia & W. Xie leg. (SYSU); 4 ♂, 3 ♀, Cotai Ecological Zone, 10.x.2020, F. Jia & W. Xie leg. (SYSU). Yunnan: 7 ♂, 8 ♀, Jinghong, xii.1984 (SYSU); 4 ♂, 7 ♀, Xishuangbanna Agricultural Science Institute, xii.1985 (SYSU); 1 ♂, 2 ♀, Xishuangbanna, xii.1985 (SYSU); 2 ♂, 3 ♀, Xishuangbanna, Jinghong, eastern city, 500m, 12.xi.1999, M. Jäch et al. leg. (NHMW, NMPC); 1 ♀, Mengla County, Shangyong Town, 2.viii.2007, L. Shi leg. (SYSU); 1 ♂, Mengla County, Shangyong Town, 1.-3.viii.2007, J. Li leg. (SYSU); 1 ♀, Mengla Nature Reserve, 4.-5.viii.2007, J. Li leg. (SYSU). Diagnosis. Smaller (TL: 4.0– 4.9 mm), oblong-oval species. Head dark brown, clypeus and anterior part of frons usually paler, reddish; pronotum dark brown, laterally broadly reddish, anterior and posterior margin sometimes reddish translucent; elytra dark brown to black, with paler, reddish brown sides laterally from stria 6. Pronotum with short longitudinal strioles laterally. Each elytron with six complete discal striae and one submarginal stria: striae 1 and 5 beginning slightly posteriorly from base, stria 6 more distinctly so; even striae ending close to apex, odd striae usually shorter, ending more subapically; stria 6 shortest, ending at apical fourth; submarginal stria long, beginning at elytral mid-length and ending at apical fourth (Fig. 22). Median lobe of aedeagus in lateral view sickle-shaped, simple, regularly turned in apical half to obtusely pointed apex (Fig. 61). Parameres broad, ‘D’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 62). Female identical to male. Collection details. Copelatus tenebrosus inhabits various kinds of stagnant water bodies, especially puddles and small pools with at least some vegetation; abundant in paddy fields; frequently attracted at light traps. Distribution. One of the most widespread Copelatus species, occurring in the Oriental and Australian Regions, from the Indian subcontinent to Australia (Sheth et al. 2018, Hendrich et al. 2019). Its northernmost distribution is confined to southern China (Fujian, Macao, Taiwan, Yunnan) and Ryukyus (Satô 1985, Nilsson 1995); first record from Guangdong (Fig. 83)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on page 272, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Regimbart, M. (1880) The new Dytiscidae and Gyrinidae collected during the recent scientific Sumatra-expedition. Notes from the Leyden Museum, 2, 209 - 216.","Nilsson, A. N. & Hajek, J. (2022 a) A World Catalogue of the family Dytiscidae, or the Diving Beetles (Coleoptera, Adephaga). Version 1. I. 2022. Distributed as a PDF file via Internet. Available from: http: // www. waterbeetles. eu (accessed 20 January 2022)","Zimmermann, A. (1927) Fauna sumatrensis. (Beitrag Nr. 45). Revision der Haliplidae et Dytiscidae von Sumatra. Supplementa Entomologica, Berlin Dahlem, 16, 1 - 44.","Feng, H. T. (1933) Aquatic insects of China. Article VIII. Additions and corrections to the catalogue of Chinese Dytiscidae. Peking Natural History Bulletin, 7 (1932 - 33), 323 - 333.","Jach, M. A. & Easton, E. R. (1998) Water beetles of Macao (Coleoptera). In: Jach, M. A. & Ji, L. (Eds.) Water beetles of China. Vol. II. Zoologisch-Botanische Gesellschaft in Osterreich and Wiener Coleopterologenverein, Wien, pp. 43 - 50","Sheth, S. D., Ghate, H. V. & Hajek, J. (2018) Copelatus Erichson, 1832 from Maharashtra, India, with description of three new species and notes on other taxa of the genus (Coleoptera: Dytiscidae: Copelatinae). Zootaxa, 4459 (2), 235 - 260. https: // doi. org / 10.11646 / zootaxa. 4459.2.2","Hendrich, L., Shaverdo, H., Hajek, J. & Balke, M. (2019) Taxonomic revision of Australian Copelatus Erichson, 1832 (Coleoptera, Dytiscidae, Copelatinae). ZooKeys, 889, 81 - 152. https: // doi. org / 10.3897 / zookeys. 889.39090","Sato, M. (1985) The genus Copelatus of Japan (Coleoptera: Dytiscidae). Transactions of the Shikoku Entomological Society, 17, 57 - 67.","Nilsson, A. N. (1995) Noteridae and Dytiscidae: Annotated check list of the Noteridae and Dytiscidae of China (Coleoptera). In: Jach, M. A. & Ji, L. (Eds.), Water beetles of China. Vol. I. Zoologisch-Botanische Gesellschaft in Osterreich and Wiener Coleopterologenverein, Wien, pp. 35 - 96."]}

Key to species (males predominantly) 1. Each elytron with five discal striae. Dark brown with reddish head and lateral sides of pronotum, elytra with broad orange transverse basal band, lateral sides and subapical spot (Fig. 16). Small (TL: 3.5–4.0 mm), parallel-sided species from central and eastern China, Korea and Japan........................................... C. parallelus Zimmermann, 1920 - Each elytron with six or more discal striae................................................................. 2 2. Each elytron with six discal striae........................................................................ 3 - Each elytron with more than six discal striae; even striae may be short (occupying only basal fourth of elytral length) or fragmented into several strioles (Fig. 5).................................................................. 22 3. Broader species. Median lobe of aedeagus near mid-length with distinct finger-like process on ventral side (Figs 49, 59)... 4 - Narrower species. Median lobe of aedeagus usually sickle-shaped, without distinct process on ventral side.............. 5 4. Smaller (TL: 4.3–5.3 mm), widely distributed Oriental species reaching southern China. Median lobe of aedeagus near midlength with small dent on dorsal side (Fig. 49). Brown blackish, elytra usually with thin basal orange transverse band (Figs 14–15). Females dimorphic........................................................... C. oblitus Sharp, 1882 - Larger (TL: 5.2–6.1 mm), widely distributed Oriental species reaching southern and eastern China. Median lobe of aedeagus near mid-length with broad spoon-like process on dorsal side (Fig. 59). Brown blackish, elytra usually with broad comb-like shaped basal orange transverse band and orange-brown sides laterally from elytral stria 3 (Fig. 21). Females similar to males ….................................................................. C. sociennus J. Balfour-Browne, 1952 5. Elytra yellow orangish with two irregular transverse blackish bands, one medially and one subapically (Fig. 28). Male unknown. Smaller (TL: 4.5–4.8 mm) species from Hongkong................................................ Copelatus sp. - Elytra brown to black, at most with paler lateral sides and transverse basal band................................... 6 6. Median lobe of aedeagus near mid-length with large irregular process on dorsal side (Fig. 65). Dark brown, head, lateral sides of pronotum, and base and lateral sides of elytra usually paler (Fig. 25). Larger (TL: 5.1–5.5 mm) species from northeastern China............................................................... C. weymarni J. Balfour-Browne, 1947 - Median lobe of aedeagus with dorsal side simple, continuous.................................................. 7 7. Elytra blackish with paler lateral sides, without pale transverse basal band (Fig. 22). Elytral striae 1, 5 and 6 beginning posteriorly to base. Median lobe of aedeagus sickle-shaped, simple; in apical half regularly curved and only slightly narrowed to apex (Fig. 61). Smaller (TL: 4.0– 4.9 mm), widely distributed species........................... C. tenebrosus Régimbart, 1880 - Elytra light to dark brown, often with pale transverse basal band. Elytral striae usually beginning at base. Larger (TL:> 4.5 mm) species............................................................................................. 8 8. Apical part of median lobe of aedeagus bisinuous (Figs 35, 45)................................................ 9 - Apical part of median lobe of aedeagus straight or sinuous................................................... 10 9. Median lobe of aedeagus in third quarter with a distinct shallow swelling on ventral side; apical fourth slender (Fig. 35). Brown, with lateral sides of pronotum, base and lateral sides of elytra indistinctly paler (Fig. 7). Larger (TL: 5.5 mm) species from northwestern Yunnan..................................................................... C. felicis sp. nov. - Median lobe of aedeagus without swelling on ventral side; apical part broader (Fig. 45). Brown, with head, lateral sides of pronotum and thin transverse basal band on elytra orange-brown (Fig. 12). Larger (TL: 5.3–5.8 mm) species from central Yunnan........................................................................................................................................................................... C. mopanshanensis sp. nov. 10. Median lobe of aedeagus in lateral view in shape of letter “Γ” (Figs 55, 67)...................................... 11 - Median lobe of aedeagus more sickle- or hook-shaped...................................................... 12 11. Median lobe of aedeagus in mid-length with distinct trapezoidal swelling on ventral side; apical part narrow; apex pointed, turned dorsally (Fig. 55). Brown, with orange-brown lateral sides of pronotum and thin comb-like shaped transverse basal band on elytra (Fig. 19). Larger (TL: 5.0– 5.9 mm) species from Yunnan and western Guizhou....... C. rimosus Guignot, 1952 - Median lobe of aedeagus in mid-length without any swelling, medially sinuous on dorsal side; apical part broader, narrowing continuously to straight apex (Fig. 67). Brown, with orange-brown head, lateral sides of pronotum and broad transverse basal band on elytra (Fig. 26). Larger (TL: 5.5 mm) species from southwestern Guizhou................ C. xiniudong sp. nov. 12. Median lobe of aedeagus straight in middle three fifths of its length; apical fifth strongly curved, hook-shaped (Fig. 47). Head and pronotum brown, elytra pale brown with broad orange transverse basal band (Fig. 13). Smaller (TL: 4.6–4.9 mm) species from northern Guangdong........................................................... C. nanlingensis sp. nov. - Median lobe of aedeagus curved in basal three fourths of its length; apical fourth straight or sinuous, but never hook-shaped.................................................................................................… 13 13. Median lobe of aedeagus in apical third almost straight or slightly turned ventrally (Figs 31, 33, 43) …................ 14 - Median lobe of aedeagus in apical third distinctly curved dorsally............................................. 16 14. Median lobe of aedeagus in apical third slightly turned ventrally; distinctly narrowing to slender apical part (Fig. 43). Dark brown, with orange-brown clypeus, lateral sides of pronotum and thin transverse basal band on elytra (Fig. 11). Larger (TL: 5.6–6.1 mm) species from western Guizhou............................................... C. miaowangi sp. nov. - Median lobe of aedeagus in apical third straight, slightly but continually narrowing to skewed apex. Head and pronotum dark brown with orange clypeus and lateral sides of pronotum; elytra brown with broad orange transverse basal band. Comparatively smaller (TL: 4.6–5.6 mm) species....................................................................... 15 15. Median lobe of aedeagus in two thirds of its length with small tooth on ventral side (Fig. 33). Larger (TL: 5.2–5.6 mm) species from southeastern China............................................................. C. dentatipenis sp. nov. - Median lobe of aedeagus without tooth on ventral side (Fig. 31). Medium sized (TL: 4.6–5.3 mm) species from central and eastern China................................................................ C. chinensis Régimbart, 1899 16. Median lobe of aedeagus strongly arched; broad in basal two thirds of its length, very narrow in apical third (Fig. 39). Head and pronotum dark brown with orange clypeus and lateral sides of pronotum; elytra brown with comb-like shaped yellowish orange transverse basal band (Fig. 8). Larger (TL: 5.3–5.7 mm) species from eastern China and Japan... C. japonicus Sharp, 1884 - Median lobe of aedeagus weakly to moderately arched; at least in apical third continuously narrowing to apex.......... 17 17. Median lobe of aedeagus only weakly arched; narrowing continuously from basal part to apex; apex slightly turned ventrally (Fig. 29). Brown, with orange clypeus, lateral sides of pronotum and transverse basal band on elytra (Fig. 1). Medium sized (TL: 4.9–5.3 mm), widely distributed Oriental species reaching southern part of China........ C. bacchusi Wewalka, 1981 - Median lobe of aedeagus moderately arched; in basal half (or basal two thirds) broad, then narrowing to apex; apex not turned ventrally........................................................................................... 18 18. Median lobe of aedeagus broad in basal three fourths of its length, then narrowing to obtusely pointed apex (Fig. 37); lateral carina of median lobe with small spines in apical half (Fig. 37 aa). Head and pronotum dark brown with orange clypeus and lateral sides of pronotum; elytra brown with orange transverse basal band (Figs 5–6). Medium sized (TL: 4.7–5.5 mm), widely distributed Oriental species reaching China in southern Yunnan..................... C. diversistriatus sp. nov. (partim) - Median lobe of aedeagus broad in basal half of its length, then narrowing to obtusely pointed apex; lateral carina of median lobe without small spines in apical half...................................................................... 19 19. Median lobe of aedeagus broadest in mid-length, apical part relatively broad (Fig. 63). Dark brown, with orange clypeus, lateral sides of pronotum and thin transverse basal band on clypeus (Figs 23–24). Larger (TL: 5.1–5.9 mm) species from western Yunnan........................................................................ C. tengchongensis sp. nov. - Median lobe of aedeagus broadest in basal part, apical part narrow............................................. 20 20. Median lobe of aedeagus more arched; subapically nearly straight on dorsal side; apex very thin, distinctly turned dorsally (Fig. 57). Elytral stria 1 may be fragmented or absent basally. Dark brown, with orange lateral sides of pronotum and indistinct thin transverse basal band on elytra (Fig. 20). Females dimorphic. Larger (TL: 5.1–5.9 mm) species from western Yunnan........................................................................................... C. rosulae sp. nov. - Median lobe of aedeagus less arched; in apical half distinctly curved on dorsal side; apex not turned dorsally (Figs 41, 53). Head and pronotum dark brown with orange clypeus and lateral sides of pronotum; elytra brown, sometimes with slightly paler base............................................................................................... 21 21. Median lobe of aedeagus more arched, distinctly curved throughout its whole length (Fig. 41). Larger (TL: 5.1–5.7 mm) species from northern Myanmar and western Yunnan, China.................................... C. malaisei Guignot, 1954 - Median lobe of aedeagus less arched, in midpart nearly straight (Fig. 53). Larger (TL: 4.8–5.8 mm) species from southern Yunnan, China and neighbouring areas of northeastern Laos and northern Vietnam................ C. puzhelongi sp. nov. 22. Each elytron with six complete, well impressed discal striae and 1–4 short striae in between; short striae may be fragmented into several strioles or absent; submarginal stria present, long. Dark brown, with orange clypeus, lateral sides of pronotum and transverse basal band on elytra (Fig. 5). Median lobe of aedeagus sickle-shaped; broad in basal three fourths of its length, then narrowing to obtusely pointed apex (Fig. 37); lateral carina of median lobe with small spines in apical half (Fig. 37 aa). Medium sized (TL: 4.7–5.5 mm), widely distributed Oriental species reaching China in southern Yunnan............................................................................................... C. diversistriatus sp. nov. (partim) - Each elytron with 11 complete, shallowly impressed discal striae; submarginal stria fragmented into several short strioles or absent. Brown, with orange head, lateral sides of pronotum and broad transverse basal band on elytra (Fig. 27). Median lobe of aedeagus broad, club-shaped, with two protuberances on dorsal side; apex beak-shaped (Fig. 69). Larger (TL: 5.4–5.7 mm) species from southeastern China.......................................... C. zimmermanni Gschwendtner, 1934, Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 276-278, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Zimmermann, A. (1920) Bemerkenswerte Neuerwerbungen des Zoologischen Museums in Hamburg. Haliplidae, Dytiscidae et Gyrinidae. Entomologische Blatter, 16, 224 - 234.","Sharp, D. (1882) On aquatic carnivorous Coleoptera or Dytiscidae. Scientific Transactions of the Royal Dublin Society, Series 2, 2, 179 - 1003, pls. 7 - 18. https: // doi. org / 10.5962 / bhl. title. 9530","Balfour-Browne, J. (1947) The aquatic Coleoptera of Manchuria (Weymarn collection). The Annals and Magazine of Natural History, Eleventh Series, 13 (1946), 433 - 460. https: // doi. org / 10.1080 / 00222934608654567","Regimbart, M. (1880) The new Dytiscidae and Gyrinidae collected during the recent scientific Sumatra-expedition. Notes from the Leyden Museum, 2, 209 - 216.","Guignot, F. (1952) Description de dytiscides inedits de la collection Regimbart. Revue Francaise d'Entomologie, 19, 17 - 31.","Regimbart, M. (1899) Revision des Dytiscidae de la region Indo-Sino-Malaise. Annales de la Societe Entomologique de France, 68, 186 - 367.","Sharp, D. (1884) The water-beetles of Japan. The Transactions of the Entomological Society of London, 1884, 439 - 464.","Wewalka, G. (1981) Drei neue Arten der Gattung Copelatus aus Indien (Dytiscidae, Col.). Koleopterologische Rundschau, 55, 65 - 70.","Guignot, F. (1954) Entomological results from the Swedish expedition 1934 to Burma and British India. Coleoptera: Haliplidae et Dytiscidae. Recueillis par Rene Malaise. Arkiv for Zoologi, 6 (32), 563 - 567."]}

Copelatus sp. (Fig. 28) Material examined. CHINA: Hongkong: 6 ♀, Lantau Isl., Ngong Ping vill., Po Lin Monastery env., 22°15.2-5′N 113°54.6′E, 480-590 m, stream, 26.-28.vi.2007, J. Hájek & J. Růžička leg. (NMPC). Diagnosis. Medium sized (TL: 4.5–4.8 mm), oblong-oval species. Head testaceous, with dark band along eyes and infuscation on frons between eyes; pronotum brown blackish, laterally broadly testaceous; elytra yellow orangish with two irregular transverse blackish bands, one medially and one subapically. Pronotum with short longitudinal strioles laterally. Each elytron with six complete discal striae and one submarginal stria: all striae beginning at base; stria 1 longest; striae 2–5 shorter, ending subapically; stria 6 shortest ending at apical fourth; submarginal stria long, beginning before elytral mid-length (Fig. 28). Comments on the classification. Based on presence of six discal and a submarginal stria on each elytron, the species can be included in the C. irinus species group. With the distinctive yellow-black colour pattern of elytra, it could not be associated with any species currently known from the Sino-Japanese region and may represent an undescribed species. However, without a male available for the study, we prefer to leave this taxon unidentified at the species level. Collection details. All specimens were collected at night in a small, shaded stream flowing in subtropical broadleaved forest (Fig. 80). Despite considerable efforts of our colleagues, the species was never collected again; most streams in the area are currently captured in pipes and dried (P. Aston, pers. comm.). Distribution. The species is known only from one locality on Lantau Island, Hongkong., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on page 276, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696

Copelatus chinensis Régimbart, 1899 stat. rest. (Figs 2–3, 31–32) Copelatus chinensis Régimbart, 1899: 298. Copelatus collocallosus Falkenström, 1932: 192, syn. nov. Copelatus collocallosus Falkenström, 1933: 14; synonymy by Gschwendtner (1939: 40). Type locality. Copelatus chinensis: Chine: Chang-Yang [China, Hubei Province, Changyang Tujia Autonomous County]. Copelatus collocallosus: “ China: NO Szechuan” [China, northeast Sichuan Province or Chongqing Municipality]. Type material. Copelatus chinensis: Holotype ♂ (MNHN), labelled: “Chang- / Yang [hw] // MUSEUM PARIS / COLL MAURICE REGIMBART / 1908 [p] // TYPE [red label, p] // chinensis Rég. [hw] // GUIGNOT det., 19 [p] 51 [hw] / Copelatus / japonicus Sharp [hw]”. Copelatus collocallosus: Holotype ♀ (NHRS), labelled: “Kina / N. O. Szechuan [p] // Sven Hedins / Exp. Ctr. Asien / Dr Hummel [p] // 22.5 [hw] // Typus [red label with black frame, p] // Cop. collocallosus / n. sp. / Typ. [hw] / det. Falkenström [p] // 5606 / E91 [blue label, p] // NHRS/JLKB / 000027137 [p]”. Additional material examined. CHINA: Hunan: 1 ♂, 1 ♀, 80 km N Dayong, Yanjiajie, 27.-29.v.2005, O. Nakládal leg. (NMPC); 2 ♂, 1 ♀, Shaoyang, Chengbu County, Jinzishan forest farm, Shuangjiangkou, 26.3046N 110.4961E, 1371 m, 24.viii.2020, Z. Jiang leg. (SYSU). Shandong: 1 ♀, Qingdao City, 17.ix.1994, Ji & Wang leg.; 1 ♀, Taishan Nat. Res., 200 m, 18.x.1994, Ji & Wang leg.; 1 ♂, Taishan Nat. Res., 420 m, 19.x.1994, Ji & Wang leg. (all NHMW). Zhejiang: 45 spec., West Tianmu Shan (Mts.) reserve, border of secondary mixed forest nr entrance of reserve, 30°18.9′N 119°26.5′E, 320 m, pool, 23.vi.-6.vii.2017, J. Hájek & J. Růžička leg. (NMPC, SNUC, ZSMG); 1 ♂, 1 ♀, Quzhou, Kecheng distr., Lankeshan Mt., 28.8781N 118.9199E, 118 m, 18.iii.2020, Z. Jiang leg. (SYSU); 1 ♂, Quzhou, Qujiang distr., Tongshanyuan reservoir, 29.1300N 118.9434E, 93 m, 14.iii.2020, Z. Jiang leg. (SYSU). Diagnosis. Medium sized (TL: 4.6–5.3 mm), oblong-oval species. Head with reddish clypeus, frons and vertex darkened, brown blackish; pronotum brown blackish, laterally broadly testaceous; elytra brown with broad, irregularly shaped, basal orange band reaching suture. Pronotum with short longitudinal strioles laterally. Each elytron with six complete discal striae and one submarginal stria: all striae beginning at base; stria 1 longest, ending close to apex; striae 2–5 somewhat shorter, ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fourth (Fig. 2). Median lobe of aedeagus in lateral view sickle-shaped, narrowing in apical fourth to skewed, dorsally slightly extended apex; dorsal and ventral side of apical part straight (Fig. 31). Parameres moderately broad, ‘C’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 32). Female similar to male, strioles on pronotum more numerous. Comments on the classification. Guignot (1952) synonymized C. chinensis with C. japonicus Sharp, 1884 based on the drawing of median lobe of the latter species by Balfour-Browne (1947). However, the dissection of the holotype of C. chinensis revealed that the genitalia of both taxa are quite different (see Figs 31 and 39). Therefore, we reinstate C. chinensis as a valid species. Copelatus collocallosus was described twice, based on a single teneral female (Fig. 3); the first brief description (Falkenström 1932) was subsequently supplemented with a differential diagnosis from C. chinensis: pale colouration, different body shape, indistinct punctation, small number of extremely short strioles on the pronotum, rather long submarginal stria (Falkenström 1933). Gschwendtner (1939) was the first who considered C. collocallosus as a synonym of C. chinensis; however, probably based on synonymy of C. chinensis with C. japonicus by Guignot (1952), Satô (1982) mentioned C. collocallosus as a synonym of C. japonicus – a state which was largely accepted until now (cf. Nilsson 1995, Nilsson & Hájek 2022a). However, our study confirmed specific status of C. chinensis (see above). Further, in accordance with Gschwendtner (1939), the comparison of the C. collocallosus holotype with the extensive material of C. chinensis showed that both taxa are morphologically indistinguishable, including identical punctation of dorsal surface, presence of strioles on pronotum and length of elytral striae. Therefore, we consider C. collocallosus as a junior subjective synonym of C. chinensis, although we are aware that the identity of C. collocallosus is doubtful as the teneral female does not possess characters usable for species identification – the species of the C. japonicus complex are recognisable predominantly based on male genitalia. Anyway, the synonym of C. chinensis and C. collocallosus also seems reasonable from a biogeographical point of view: C. chinensis is widely distributed in Central China, and its type locality in Hubei lies only ca. 100 apart from the border of Chongqing Municipality (a presumed type locality of C. collocallosus). Collection details. In Tianmushan (Zhejiang), Copelatus chinensis was collected in number in exposed side pool of a river with sandy bottom (Fig. 71); few specimens were found also in shaded forest puddle with muddy bottom. Distribution. Central and eastern China (Hubei, Hunan, Shandong, Sichuan or Chongqing, and Zhejiang provinces) (Fig. 81)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 253-254, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Regimbart, M. (1899) Revision des Dytiscidae de la region Indo-Sino-Malaise. Annales de la Societe Entomologique de France, 68, 186 - 367.","Falkenstrom, G. A. (1932) Vorlaufige Mitteilung uber die neuen Halipliden und Dytisciden, von Dr. D. Hummel in den Jahren 1927 - 30 wahrend Dr. Sven Hedins China-Expedition eingesammelt. Entomologisk Tidskrift, 53, 191 - 192.","Falkenstrom, G. A. (1933) Schwedisch-chinesische wissenschaftliche Expedition nach den nordwestlichen Provinzen Chinas, unter Leitung von Dr. Sven Hedin und Prof. Su Ping-chang. Insekten gesammelt vom schwedischen Arzt der Expedition Dr. David Hummel 1927 - 1930. 15. Coleoptera. 1. Haliplidae und Dytiscidae. Arkiv for Zoologi, 27 A (1), 1 - 22.","Gschwendtner, L. (1939) Monographie der palaarktischen Dytisciden. X. Erganzungen und Register. Koleopterologische Rundschau, 25, 23 - 69.","Guignot, F. (1952) Description de dytiscides inedits de la collection Regimbart. Revue Francaise d'Entomologie, 19, 17 - 31.","Sharp, D. (1884) The water-beetles of Japan. The Transactions of the Entomological Society of London, 1884, 439 - 464.","Balfour-Browne, J. (1947) The aquatic Coleoptera of Manchuria (Weymarn collection). The Annals and Magazine of Natural History, Eleventh Series, 13 (1946), 433 - 460. https: // doi. org / 10.1080 / 00222934608654567","Nilsson, A. N. (1995) Noteridae and Dytiscidae: Annotated check list of the Noteridae and Dytiscidae of China (Coleoptera). In: Jach, M. A. & Ji, L. (Eds.), Water beetles of China. Vol. I. Zoologisch-Botanische Gesellschaft in Osterreich and Wiener Coleopterologenverein, Wien, pp. 35 - 96.","Nilsson, A. N. & Hajek, J. (2022 a) A World Catalogue of the family Dytiscidae, or the Diving Beetles (Coleoptera, Adephaga). Version 1. I. 2022. Distributed as a PDF file via Internet. Available from: http: // www. waterbeetles. eu (accessed 20 January 2022)"]}

Copelatus mopanshanensis Jiang, Zhao & Hájek sp. nov. (Figs 12, 45–46) Type locality. China, Yunnan Province, Xinping Yi and Dai Autonomous County, Mopan Mountain National Forestry Park, 23°56′18.71″N 101°59′17.16″E, ca. 2520 m. Type material. Holotype ♂ (ZSMG), labelled: “ China: Yunnan, Mo Pan shan / Liao Wa Ta, 2526m, 19.v.2011 / 23.93853 N 101.98810 E, Song / Keking M (1398) [p] // DNA / M.Balke / 6576 [p, green typing] // HOLOTYPE / COPELATUS / mopanshanensis sp. nov. / Jiang, Zhao & Hájek det. 2021 [red label, p]”. Paratypes: 1 ♂, 1 ♀, same label data as holotype (NMPC, ZSMG); 1 ♂, 3 ♀, labelled: “ CHINA: Yunnan Province / Mopanshan Mt., Yuelianghu / 23.947N 101.965E / 1973 m, 19.v.2011 / Keqing Song leg. [p]” (SYSU). All paratypes with the respective paratype label. Description of male holotype. Habitus (Fig. 12) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, convex. Dorsal surface shiny. Colouration. Head brownish black, clypeus and two oval spots on vertex reddish brown; pronotum brownish black, laterally broadly orange-brown, anterior and posterior margin somewhat orange-brown translucent; elytra brown, lateral sides and base indistinctly paler – orange-brown; appendages orange-brown; ventral side brownish black. Head. Moderately broad, ca. 0.61× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present also in fronto-clypeal depressions; fine punctures smaller and sparser on clypeus, becoming larger and more dense posteriorly. Pronotum. Transverse (width/length ratio = 2.76), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading thin but distinct, except for anterior angles. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, laterally close to sides, several punctures present also in shallow baso-lateral depressions along basal margin. Pronotum without strioles, surface baso-laterally only with indistinct wrinkles. Centre of disc with shallowly impressed medial longitudinal groove. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six complete discal and one submarginal longitudinal striae present on each elytron: striae 2–4 beginning at base, striae 1, 5–6 beginning slightly posteriorly to base; stria 1 longest, ending close to apex; striae 2–5 somewhat shorter, ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fifth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation not perceptible. Metaventrite with microsculpture consisting of polygonal meshes, laterally with oblique strioles; lateral parts of metaventrite (“metasternal wings”) tongue-shaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with short oblique strioles; reticulation consisting of elongate, oblique, polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present medially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side. Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view sickle-shaped, broad in basal two thirds of its length, with bulge on ventral side in two thirds; apical third slender, bisinuous, apex obtusely pointed (Fig. 45). Parameres moderately broad, ‘D’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 46). Female. Identical to male in habitus. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Pronotum baso-laterally with several irregular longitudinal strioles. Very short and sparse irregular strioles present between striae in basal half of elytra. Variability. In addition to differences of female described above, no substantial variability can be seen in the limited number of specimens available to us. Measurements. TL: 5.3–5.8 mm (mean value: 5.6 ± 0.2 mm); holotype: 5.8 mm. TL-h: 4.8–5.4 mm (mean value: 5.0 ± 0.2 mm); holotype: 5.4 mm. MW: 2.6–2.9 mm (mean value: 2.8 ± 0.1 mm); holotype: 2.9 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. mopanshanensis sp. nov. in the C. japonicus complex. Within the complex, the new species can be undoubtedly recognised only based on the shape of male genitalia: median lobe is broad in basal two thirds; apical part is slenderer, bisinuous. The most similar genitalia are those of Copelatus felicis sp. nov., but the median lobe is broader and with distinct swelling on ventral side in three fourths of its length, and the apical part is slenderer in the latter species (see Figs 35 and 45). Etymology. The species is named after the Mopan Shan mountains where it was collected. The specific epithet is an adjective in the nominative singular. Distribution. A species endemic to China, so far known only from two very close localities in Mopan Shan mountains in central Yunnan (Fig. 82).

Copelatus nanlingensis Hájek, Jiang, & Jia sp. nov. (Figs 13, 47–48) Type locality. China, Guangdong Province, Nanling National Nature Reserve, Dadongshan mountains, ca. 24°56.0′N 112°42.9′E, 690 m. Type material. Holotype ♂ (NMPC), labelled: “ CHINA, GUANGDONG Prov., / Nanling National Nature Reserve / Dadongshan, 18-21.iv.2013 / (shallow pool with sandy bottom) / 24°56.0′N 112°42.9′E, 690 m / J. Hájek & J. Růžička leg. [p] // HOLOTYPE / COPELATUS / nanlingensis sp. nov. / Hájek, Jiang & Jia det. 2021 [red label, p]”. Paratypes: 2 ♀, same label data as holotype and the respective paratype label (NMPC, SYSU). Description of male holotype. Habitus (Fig. 13) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, convex. Dorsal surface shiny. Colouration. Head brownish black, clypeus and two indistinct oval spots on vertex reddish brown; pronotum brownish black, laterally broadly orange-brown; elytra brown, laterally somewhat paler, base with not well delimited very broad orange band reaching suture; appendages orange brown; ventral side brownish black. Head. Moderately broad, ca. 0.62× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present at frontal level of eyes, and antero-laterally to eyes in fronto-clypeal depressions; fine punctures smaller and sparser on clypeus, becoming larger and more dense posteriorly. Pronotum. Transverse (width/length ratio = 2.62), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading thin but distinct, except for anterior angles. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, laterally close to sides, several punctures present also in shallow baso-lateral depressions along basal margin. Pronotum basolaterally and especially laterally with several, irregularly distributed short longitudinal strioles. Centre of disc with shallowly impressed medial longitudinal smooth line. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six complete discal and one submarginal longitudinal striae present on each elytron: all striae beginning at base; stria 1 longest, ending close to apex; striae 2–5 somewhat shorter, ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fifth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation not perceptible. Metaventrite with microsculpture consisting of polygonal meshes, laterally with oblique strioles; lateral parts of metaventrite (“metasternal wings”) tongue-shaped, slender. Metacoxal lines nearly complete, absent only very close to metaventrite. Metacoxal plates covered with short oblique strioles; reticulation consisting of elongate, oblique, polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present medially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side. Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view straight in middle three fifths, with dorsally bent hooklike apical part narrowing to pointed apex (Fig. 47). Parameres moderately broad, ‘D’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 48). Female. Identical to male in habitus and sculpture. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Variability. No substantial variability can be seen in the limited number of specimens available to us. Measurements. TL: 4.6–4.9 mm (mean value: 4.8 ± 0.2 mm); holotype: 4.9 mm. TL-h: 4.0– 4.5 mm (mean value: 4.3 ± 0.2 mm); holotype: 4.4 mm. MW: 2.2–2.4 mm (mean value: 2.4 ± 0.1 mm); holotype: 2.4 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. nanlingensis sp. nov. in the C. japonicus complex. Within the complex, the new species can be recognised based on smaller size and very broad basal orange band on elytra; however, the indubitable identification of C. nanlingensis sp. nov. is only possible based on the shape of male genitalia: straight median lobe with hook-like apical part is very characteristic for the new species, and unique among Chinese Copelatus. Collection details. All type specimens were collected at the border of shallow pool with sand bottom and numerous decaying tree leaves (Fig. 74). Etymology. The species is named after the Nanling mountain range where it was collected. The specific epithet is an adjective in the nominative singular. Distribution. So far known only from the type locality in Dadongshan mountains, Nanling mountain range, northern Guangdong, China (Fig. 82)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 264-265, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696

[Copelatus takakurai Satô, 1985] Comments. This Japanese species was mentioned from China without any precise data by Zeng (1989). We were not able to study the respective material, but we consider the presence of the species in China rather improbable. We believe that Zeng probably studied Copelatus chinensis from central-eastern China (see under that species). Therefore, we remove C. takakurai Chinese fauna., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on page 271, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Sato, M. (1985) The genus Copelatus of Japan (Coleoptera: Dytiscidae). Transactions of the Shikoku Entomological Society, 17, 57 - 67.","Zeng, H. (1989) Classification of Dytiscidae (Insecta: Coleoptera) - A study of the collections of Dytiscidae from major museums in China. Unpublished PhD Thesis, Department of Biology, University of Sun Yat-sen University, Guangzhou, 152 pp. [in Chinese with English abstract]"]}

Copelatus diversistriatus Jiang, Hájek & Jia, sp. nov. (Figs 5–6, 37–38) Type locality. China, Yunnan Province, Pu’er City, Laiyanghe, Xinzhai village, ca. 22°37′52″N 101°07′55″E; 1487 m. Type material. Holotype, ♂ (SYSU), labelled: “ CHINA: Yunnan Province / Pu’er City, Laiyanghe / Xinzhai Village / 22.631N, 101.132E / 1487 m, 21.v.2011 / Keqing Song leg. [p] // HOLOTYPE / COPELATUS / diversistriatus sp. nov. / Jiang, Hájek & Jia det. 2021 [red label, p]”. Paratypes: 2 ♀, same label data as holotype (SYSU); 1 ♂, labelled: “ China: Yunnan, Lai yang he / Xin zhai, 1481m, 21.v.2011, / N22.63161 E101.13255, / S. Keqing (IRS 1399) [p] // DNA / M.Balke / 6587 [p, green typing]” (ZSMG); 1 ♂, labelled: “ YUNNAN 1500-2500m / 25.22N 98.49E 17-24.5 / GAOLIGONG mts. / Vít Kubáň leg. 1995 [p]” (ZSMG); 6 ♂, 11 ♀, labelled: “ China, Yünnan prov.; / Gaoligong Shan; 2800m a.s.l. / ca 30km E Tengchong; meadow / holokren [Sic!] spring, muddy pools / 24.10.1999, leg. J. Šťastný [p]” (JSCL); 1 ♀, labelled: “ CHINA: Yünnan, Xishuangbanna / ca. 10km NW Menglun / 7.11.1999, ca. 700 m / leg. Jäch, et al. (CWBS 359) [p]” (NHMW); 2 ♂, 8 ♀, labelled: “ CHINA: Yünnan, Xishuangbanna / ca. 10km NW Menglun / 7.11.1999, ca. 700 - 800 m / leg. Jäch, et al. (CWBS 360) [p]” (NHMW); 3 ♂, labelled: “ CHINA: Yunnan province, / REHAI hot springs, 5.VI. 2007 / 6 km SW of TENGCHONG, / 24°57.1′N 098°26.2′, 1400 m, / J. Hájek & J. Růžička leg. // individually collected in small / pool with clay bottom, and on / plants and shrubs margin of / grove above the rice fields [p]” (NMPC); 1 ♂, labelled: “ CHINA: Yunnan Province / Baoshan City / Gaoligong Nature Park / 24.91N, 98.81E / 1751 m, 22.v.2016 / Y. Tang & R. Zhang leg. [p]” (SYSU); 1 ♂, labelled: “ CHINA: YUNNAN Prov. / 6 km SSW Tengchong / Rehai Hot Springs / 24°56.9′N 98°26.9′E, 1445 m / J. Hájek & J. Růžička leg. // 22.vi.2016; individually from / vegetation, in artificial watering / pools and in stream; / border of ruderal and orchards [p]” (NMPC); 21 ♂, 13 ♀, labelled: “ CHINA: YUNNAN PROV. / 14 km SE Tengchong / Renjiafen env., 2025-2145 m / 24°56.0-5′N, 98°35.0-7′E, / J. Hájek & J. Růžička leg. // 23.vi.2016 / individually from pool / border of ruderal, orchards and / secondary mixed forest [p]” (IZCAS, NHRS, NMPC, SNUC, ZFMK); 1 ♂, 1 ♀, labelled: “ CHINA: YUNNAN Prov. / TONGBIGUAN env., 1340-1380 m / 24°36.0-37.0′N, 97°35.1-4′E, / J. Hájek, J. Růžička leg. // 24.-26.vi.2016; individually from / ruderal vegetation, from fungi / on dead wood, in Bos excre- / ments, in puddles near river [p]” (NMPC); 3 ♂, 5 ♀, labelled: “ CHINA: YUNNAN Prov. / 6.5- 5.2 km W Tongbiguan / 24°36.6-8′N, 97°35.5-36.4′E, / 1290-1325 m / J. Hájek & J. Růžička leg. // 25.+ 27.vi.2016; / individually from puddle, / vegetation, fungi; / broadleaved tropical forest [p]” (NMPC); 1 ♂, labelled: “ CHINA: Yunnan Province / Lvchun County / roadside ditches and terraces / 22.8856N, 102.3264E / 1443.5 m, 1.v.2021 / Z. Jiang, Z. Yang, Z. Mai & / B. Huang leg. [p]” (SYSU). All paratypes with the appropriate printed red label. Additional material examined. LAOS: 1 ♂, 1 ♀, Attapeu Prov., Annam Highlands Mts., Dong Amphan NBCA, Nong fa (crater lake) env., 15°05.9′N 107°25.6′E, 1160 m, 30.iv.-6.v.2010, J. Hájek leg. (NMPC). MYANMAR: 2 ♂, Shan State, 35 km N Aungban, 20°55.20′N 96°33.60′E, 1320 m, flight intercept trap, 31.v.-8.vi.2002 (NHMW, NMPC); 85 spec., Shan State, NE Mintaingbin Forest Camp, 20°55.640′N 96°33.634′E, 1290 m, puddles, 14.- 20.vi.2004, H. Shaverdo leg. (NHMW, NMPC); 81 spec., Shan State, SE Mintaingbin Forest Camp, forest pools and leaf litter near stream, 17.vi.2004, H. Shaverdo leg. (NHMW, NMPC); 52 spec., Mandalay Reg., Mogok Township, S Panlin vill., W slopes of Mt. Taung Mae, ca. °58′09.7″N 96°27′11″E, 1710 m, 12.vi.2014, H. Schillhammer leg. (NHMW). THAILAND: 1 ♀, Nakhon Ratchasima Prov., Khao Yai NP, 8.-10.xii.2011, J. Šťastný leg. (ZSMG); 1 ♂, Phitsanulok Prov., Nakhon Thai Distr., Phu Hin NP, Rong Kla, 16°59′49.1″N 101°00′34.8″E, in waterfall, 7.iii.2016, A. Damaška leg. (NMPC). See the Variability section. Description of male holotype. Habitus (Fig. 5) oblong oval, with continuous outline, broadest in anterior 1/3 of elytral length, slightly convex. Dorsal surface shiny. Colouration. Head dark brown, clypeus and two oval spots on vertex rufous; pronotum dark brown, laterally broadly orange; elytra brown, laterally somewhat paler, with moderately broad, irregularly shaped, basal orange band not reaching suture; appendages orange-brown; ventral side dark brown to black. Head. Moderately broad, ca. 0.62× width of pronotum, trapezoidal. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present at frontal level of eyes, and antero-laterally to eyes in fronto-clypeal depressions. Pronotum. Strongly transverse (width/length ratio = 3.03), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading very thin and indistinct. Reticulation similar to that of head. Punctation double; rows of coarse setigerous punctures present along anterior margin, close to lateral sides, several punctures present also in shallow baso-lateral depressions along basal margin; fine puncture smaller and sparser than on head, spread throughout whole surface. Pronotum, except for centre of disc, with numerous, irregularly distributed short longitudinal or oblique strioles. Centre of disc with shallowly impressed median longitudinal smooth line. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Ten discal and one submarginal longitudinal striae present on each elytron: all striae beginning more or less at base; striae 1, 3, 5, 7, 9–10 complete; stria 1 longest, ending close to apex; striae 3, 5, 7, 9 somewhat shorter, ending subapically, stria 10 ending at apical fourth; striae 2, 4, 6 short, presented only in basal third of elytral mid-length, apically usually fragmented into several short strioles; stria 8 shortest, present only in basal fourth of elytra; submarginal stria long, beginning at elytral mid-length and ending at apical fourth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation consisting of shallow, hardly perceptible polygonal meshes. Metaventrite with microsculpture consisting of polygonal meshes; lateral parts of metaventrite (“metasternal wings”) tongue-shaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with long, longitudinal strioles; reticulation consisting of elongate, oblique polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures; coarse setigerous punctures present medially on ventrite III, and medio-laterally on ventrite VI. Male genitalia. Median lobe of aedeagus in lateral view sickle-shaped; broad in basal three quarters, slightly narrowing in apical quarter; curved in basal third, then almost parallel-sided until apical quarter, and then curved to obtusely pointed apex (Fig. 37); lateral carina of median lobe with small spines in apical half (Fig. 37 aa). Parameres moderately broad, ‘C’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 38). Female. Identical to male in habitus. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Short irregular strioles present between stria 1 and lateral margin in anterior third of elytra in some specimens. Variability. The specimens of the new species vary slightly in dorsal surface colouration, especially in extent of orange basal elytral band, which may be comb-like shaped. The specimens vary also in extent of striolation on pronotum. However, the most apparent variability is in the elytral striation: short striae 2, 4, 6, 8 vary in length, occupying from one fourth to nearly a half of elytral length; those striae may be also fragmented into several short strioles, or partly or completely reduced, thus the beetles have only six dorsal elytral striae (see below). On the other hand, several short strioles may present between regular striae. While most of the specimens from Yunnan and specimens from central Thailand agree with the holotype in the elytral striation, one population from Yunnan (6.5– 5.2 km W Tongbiguan) and the specimens from southern Laos have the even elytral striae 2, 4, 6, 8 partly reduced, and the majority of specimens from Myanmar have elytra with six discal striae only (Fig. 6). The male genitalia are identical in all studied specimens. Although we have no doubts that all material belongs to one nominal species, due to the large variability between populations and extended area of distribution, we have decided to exclude the specimens from outside Yunnan province, China from the type material. Measurements. TL: 4.7–5.5 mm (mean value: 5.2 ± 0.2 mm); holotype: 5.2 mm. TL-h: 4.3–5.0 mm (mean value: 4.7 ± 0.2 mm); holotype: 4.8 mm. MW: 2.3–2.8 mm (mean value: 2.6 ± 0.1 mm); holotype: 2.6 mm. Differential diagnosis. Based on the presence of 10 dorsal striae and a submarginal stria on each elytron, the new species can be classified within the C. erichsonii Guérin-Méneville species group. This large group is in the Oriental region represented with only three species from India and Indonesia respectively (Nilsson & Hájek 2022a). From all these species, C. diversistriatus sp. nov. clearly differs in the short even elytral striae 2, 4, 6 and 8. However, the reduction of elytral striae to six indicates that C. diversistriatus sp. nov. is in fact more closely related to species of the C. japonicus Sharp complex in the C. irinus species group. This fact is confirmed with the molecular analysis (M. Balke et al., unpublished data).The similar reduction of elytral striae was recently documented and discussed by Manuel et al. (2018) in Neotropical Copelatus. Within the members of the C. japonicus complex, the specimens of the new species with six dorsal striae on each elytron can be undoubtedly recognized only based on the median lobe of male genitalia, which is simple, sickle-shaped, broad in basal three fourths, and then slightly narrowed to obtusely pointed apex. Collection details. Copelatus diversistriatus sp. nov. was collected predominantly in small temporary pools or ditches with muddy bottom, both densely vegetated and without any vegetation (Fig. 73). In western Yunnan, it was repeatedly collected syntopically with C. malaisei Guignot, 1954. Etymology. The species name is composed from the Latin adjectives diversus (-a, -um) (= diverse), and striatus (-a, -um) (= with striae), referring to the diverse length of odd and even elytral striae. Distribution. Widely distributed species, recorded from southwest China (southern Yunnan) (Fig. 81), neighbouring Shan State in eastern Myanmar, as well as Mandalay Region in central Myanmar, central Thailand (Nakhon Ratchasima and Phitsanulok provinces) to southern Laos (Attapeu province)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 256-258, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Nilsson, A. N. & Hajek, J. (2022 a) A World Catalogue of the family Dytiscidae, or the Diving Beetles (Coleoptera, Adephaga). Version 1. I. 2022. Distributed as a PDF file via Internet. Available from: http: // www. waterbeetles. eu (accessed 20 January 2022)","Manuel, M., Deler-Hernandez, A., Megna, Y. S. & Hajek, J. (2018) Copelatus Erichson from the Dominican Republic, with the description of a new species, comments on elytral striation and faunistic notes on Antillean species (Coleoptera: Dytiscidae: Copelatinae). Zootaxa, 4399 (3), 371 - 385. https: // doi. org / 10.11646 / zootaxa. 4399.3.7","Guignot, F. (1954) Entomological results from the Swedish expedition 1934 to Burma and British India. Coleoptera: Haliplidae et Dytiscidae. Recueillis par Rene Malaise. Arkiv for Zoologi, 6 (32), 563 - 567."]}

Copelatus parallelus Zimmermann, 1920 (Figs 16, 51–52) Copelatus parallelus Zimmermann, 1920: 226. Type locality. “Setsu, Zentral-Japan” [Japan, Honshu, Osaka Prefecture, Settsu, ca. 34°46′N 135°33′]. Type material. Holotype ♂, originally deposited in Zoologisches Museum, Centrum für Naturkunde, Universität Hamburg, Hamburg, Germany; destroyed during WW2. Material examined. CHINA: Hebei: 1 ♀, Baiyangdian, Mapu vill., 16.vii.-11.viii.2012, J. Wang & P. Wei leg. Hubei: 1 ♀, Wuchang, 17.v.1961, Z. Pu leg. Hunan: 1 ♂, Huaihua, Yushuwan, 17.vi.1965, Z. Chen leg. Shanghai: 1 ♀, 20.iv.1950 (all SYSU). Diagnosis. Small species (TL: 3.5–4.0 mm), oblong-oval species, lateral sides of elytra nearly parallel in basal two thirds of their length. Head reddish; pronotum dark brown with reddish anterior margin and lateral sides; elytra brownish black, with broadly orange base and thin lateral orange band broadening posteriorly to lateral subapical spot. Pronotum with several short strioles basally and laterally. Each elytron with five longitudinal discal striae: all striae beginning at base and ending approximately in apical fifth of elytral length (Fig. 16). Median lobe simple, sickle shaped, broad (widest at middle), only slightly narrowing to beak-shaped apex (Fig. 51). Parameres broad, ‘D’-shaped; apex long and slender; apical lobes long, club-shaped (Fig. 52). Female similar to male in habitus. Distribution. A species described from Japan and recently recorded also from Korea (Jung et al. 2020). First records from China (Hebei, Hubei, Hunan and Shanghai) (Fig. 82)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on page 266, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Zimmermann, A. (1920) Bemerkenswerte Neuerwerbungen des Zoologischen Museums in Hamburg. Haliplidae, Dytiscidae et Gyrinidae. Entomologische Blatter, 16, 224 - 234.","Jung, S. W., Min, H. K. & Lee, D. - H. (2020) Aquatic beetles fauna in Nohwa and Bogil Islands, and Copelatus parallelus (Coleoptera: Dytiscidae) and Scirtes sobrinus (Coleoptera: Scirtidae) new to South Korea. Animal Systematics, Evolution, and Diversity, 36 (2), 128 - 138. https: // doi. org / 10.5635 / ASED. 2020.36.2.004"]}

Copelatus bacchusi Wewalka, 1981 (Figs 1, 29–30) Copelatus bacchusi Wewalka, 1981: 66. Type locality. “Indien, Utar Pradesh, Kumaun, Haldwani” [India, Uttarakhand State, Kumaon Division, Haldwani, ca. 29°13′N 79°31′E]. Type material. Holotype ♂, deposited in BMNH (not studied). Material studied. CHINA: Hainan: 1 ♂, Jianfeng Mts., Tian Chi, 750 m, 23.i.1996, Ji & Wang leg. (NHMW). Yunnan: 1 ♂, Xishuangbanna, ca. 15 km W Menglun, ca. 700-800 m, 5.xi.1999, M. Jäch et al. leg. (NHMW). Diagnosis. Medium sized (TL: 4.9–5.3 mm), oblong-oval species. Head with testaceous clypeus, frons and vertex usually darkened, brown; pronotum orange-brown to dark brown, laterally broadly testaceous; elytra brown with testaceous lateral sides and broad basal testaceous band not reaching suture. Pronotum with short longitudinal strioles laterally. Each elytron with six complete discal striae and one submarginal stria: striae 1–5 beginning at base and ending close to apex, odd striae somewhat longer than even ones; stria 6 shorter, absent at base and ending at apical fourth; submarginal stria rather short, presenting only in third fourth of elytral length (Fig. 1). Median lobe of aedeagus in lateral view weakly sickle-shaped with apex slightly skewed on ventral side (Fig. 29). Parameres slender, ‘C’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 30). Female similar to male, strioles on pronotum more numerous. Distribution. The species was described, and for 40 years known only from the Uttarakhand State in northern India. Recently, Shaverdo et al. (2021) provided additional records not only from Bhutan and Nepal in the Himalayan Region, but also from Myanmar, Thailand and Vietnam, suggesting that C. bacchusi is widespread in the continental southeast Asia. The present records from two distant Chinese provinces confirm this statement. First records from China (Hainan and Yunnan provinces) (Fig. 81)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on page 253, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Wewalka, G. (1981) Drei neue Arten der Gattung Copelatus aus Indien (Dytiscidae, Col.). Koleopterologische Rundschau, 55, 65 - 70.","Shaverdo, H., Wewalka, G., Stastny, J., Hendrich, L., Fery, H. & Hajek, J. (2021) New records of diving beetles and corrections updating the Catalogue of Palearctic Dytiscidae (Coleoptera). Aquatic Insects, 42 (2), 179 - 196. https: // doi. org / 10.1080 / 01650424.2021.1903509"]}

Copelatus xiniudong Jiang, Hájek & Jia sp. nov. (Figs 26, 67–68) Type locality. China, Guizhou Province, Anlong County, Dushan Township, Xiniu Dong cave env., ca. 25°18.9′N 105°35.3′E, ca. 1030 m. Type material. Holotype ♂ (SYSU), labelled: “ DZ州ṘAEẸ山犀牛洞 / ffi洞口‖ 50 ※水潭/Ṗ志洪 Ā 2009- VII-14 // CHINA: Guizhou Province / Anlong County, Dushan / Township, Xiniudong / pool about 50 metres from / entrance of the cave / 14.vii.2009, Zhihong Xue leg. [p] // HOLOTYPE / COPELATUS / xiniudong sp. nov. / Jiang, Hájek & Jia det. 2021 [red label, p]”. Paratypes: 1 ♂, 1 ♀, same label data as holotype and the respective paratype label (SYSU). Description of male holotype. Habitus (Fig. 26) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, slightly convex. Dorsal surface shiny. Colouration. Head dark brown, clypeus orange brown; pronotum dark brown, laterally broadly orange brown; elytra dark brown, with very broad, irregularly shaped, transverse basal orange brown band not reaching suture; appendages orange brown; ventral side dark brown. Head. Moderately broad, ca. 0.64× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present at frontal level of eyes, and antero-laterally to eyes in fronto-clypeal depressions; fine punctures smaller and sparser on clypeus, becoming larger and more dense posteriorly. Pronotum. Transverse (width/length ratio = 2.76), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading very thin but distinct except for anterior angles. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, laterally close to sides, several punctures present also in shallow baso-lateral depressions along basal margin. Pronotum baso-laterally and especially laterally with several, irregularly distributed short longitudinal strioles. Centre of disc with shallowly impressed medial longitudinal groove. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six discal and one submarginal longitudinal striae present on each elytron: all striae beginning at base; stria 1 longest, ending close to apex; striae 2–5 somewhat shorter, ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fourth. Reticulation similar to that of head and pronotum. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation imperceptible. Metaventrite with microsculpture consisting of polygonal meshes; lateral parts of metaventrite (“metasternal wings”) tongueshaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with short, longitudinal strioles and some transverse wrinkles; reticulation consisting of elongate, longitudinal and oblique polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present antero-medially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side. Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view in shape of letter “Γ”, broadest at basal part, middle part narrower, curved at apical third, narrowing to pointed apex; middle part ca. 1.75 times longer than basal part (Fig. 67). Parameres moderately broad, ‘D’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 68). Female. Identical to male in habitus and sculpture. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Variability. No substantial variability can be seen in the limited number of specimens available to us. Measurements. TL: 5.5 mm; TL-h: 4.8 mm. MW: 2.6 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. xiniudong sp. nov. in the C. japonicus complex. Within the complex, the new species can be undoubtedly recognised only based on the shape of male genitalia: the median lobe of aedeagus of C. xiniudong sp. nov. is most similar to that of C. rimosus. However, it is without any swelling in mid-length; medially the median lobe is sinuous on dorsal side; its apical part is broader, narrowing continuously to straight apex (see Figs 55 and 67). In addition, C. xiniudong sp. nov. is characteristic with the broad pale transverse basal band on elytra, while the basal band of C. rimosus is usually narrow (or even indistinct). Etymology. The species is named after the type locality, Xiniudong – a karst cave in Guizhou Province, China. The specific epithet is a noun in the nominative singular. Distribution. So far known only from the type locality in southwestern Guizhou, China (Fig. 83)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 274-275, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696

Copelatus felicis Hájek, Jiang, & Jia, sp. nov. (Figs 7, 35–36) Type locality. China, Yunnan Province, Yulong Naxi Autonomous County, Baishui village, ca. 27°08′N 100°15′E, 2800 m. Type material. Holotype ♂ (NMPC), labelled: “ China, Yünnan prov.; / 2800m, 20 km N LIJIANG; / Baishui; gravely, muddy / stream (0,5m wide) / 21.10.1999, leg. J. Šťastný [p] // HOLOTYPE / COPELATUS / felicis sp. nov. / Hájek, Jiang & Jia det. 2021 [red label, p]”. Paratype: 1 ♂, same label data as holotype and the respective paratype label (JSCL). Description of male holotype. Habitus (Fig. 7) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, convex. Dorsal surface shiny. Colouration. Head brownish black, clypeus reddish brown; pronotum brownish black, laterally broadly orangebrown, anterior and posterior margin somewhat orange-brown translucent; elytra brown, base and lateral sides indistinctly paler; appendages orange-brown; ventral side brown blackish. Head. Moderately broad, ca. 0.63× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present also in fronto-clypeal depressions; fine punctures smaller and sparser on clypeus, becoming larger and more dense posteriorly. Pronotum. Transverse (width/length ratio = 2.54), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading thin but distinct, except for anterior angles. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, laterally close to sides, several punctures present also in shallow baso-lateral depressions along basal margin. Pronotum without strioles, surface baso-laterally only with indistinct wrinkles. Centre of disc with shallowly impressed medial longitudinal smooth line. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six discal and one submarginal longitudinal striae present on each elytron: striae 2–4 beginning at base, striae 1 and 5 beginning slightly posteriorly to base, stria 6 beginning with few punctures; stria 1 longest, ending close to apex; striae 2–5 somewhat shorter, ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning at elytral mid-length and ending at apical fifth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation not perceptible. Metaventrite with microsculpture consisting of polygonal meshes; lateral parts of metaventrite (“metasternal wings”) tongueshaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with short oblique strioles; reticulation consisting of elongate, oblique, polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present medially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side. Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view broad in basal three fourths, broadest in third fourth where distinct shallow swelling present on ventral side; apical fourth slender and bisinuous, apex pointed (Fig. 35). Parameres moderately broad, ‘D’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 36). Female. Unknown. Variability. No substantial variability can be seen between the two specimens available. Measurements. TL: 5.5 mm; TL-h: 5.0 mm. MW: 2.6 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. felicis sp. nov. in the C. japonicus complex. Within the complex, the new species can be undoubtedly recognised only based on the shape of male genitalia: median lobe is broad in basal three fourths, on ventral side with distinct swelling, apical part is slender, bisinuous. The most similar genitalia are those of Copelatus mopanshanensis sp. nov.; but the median lobe is slenderer and without swelling on ventral side in basal three fourths of its length, and its apical part is broader in the latter species (see Figs 35 and 45). Collection details. Both type specimens were collected in rather polluted, ca. 0.5 m wide, muddy gutter surrounding the garden of famous local Chinese herbalist He Shixiu (called also “Dr. Ho”) in Baishui village (J. Šťastný, pers. comm.). At the locality it was syntopical with C. rimosus Guignot, 1952. Etymology. The species is dedicated to its collector, Jaroslav Šťastný (Liberec, Czech Republic), well known specialist on diving beetles. The Latin word felix is a translation of the surname “Šťastný”, meaning “the happy one” in Czech. The specific epithet is a noun in the genitive singular. Distribution. So far known only from the type locality in Yulong Xueshan mountains, northern Yunnan, China (Fig. 81)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 258-260, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Guignot, F. (1952) Description de dytiscides inedits de la collection Regimbart. Revue Francaise d'Entomologie, 19, 17 - 31."]}

Copelatus tengchongensis Hájek, Jiang & Jia sp. nov. (Figs 23–24, 63–64) Type locality. China, Yunnan Province, 12 km NE Tengchong, Beihai Wetlands, Zing Hai lake env., ca. 25°07.5′N 98°33.3′E, ca. 1730 m. Type material. Holotype ♂ (NMPC), labelled: “ China, Yünnan prov. / 10 km NE Tengchong; Behai [Sic! See the type locality.] / ZingHai lake env; / small flowing pools, dense veget. / 27.10.1999, leg. J. Šťastný [p] // HOLOTYPE / COPELATUS / tengchongensis sp. nov. / Hájek, Jiang & Jia det. 2021 [red label, p]”. Paratypes: 2 ♂, 4 ♀, same label data as holotype (JSCL, NMPC); 7 ♂, 7 ♀, labelled: “ CHINA (Yunnan) / Baoshan Pref., Gaoligong Shan / 65 km NNE Tengchong 1750 m / 25°35′20″N, 98°40′21″E / (small brook at edge of sec. / mixed forest) / 27.VIII.2009 D.W.Wrase (10G) [p]” (NMPC, SYSU, ZSMG). All paratypes with the respective paratype label. Description of male holotype. Habitus (Fig. 23) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, slightly convex. Dorsal surface shiny. Colouration. Head brown blackish, clypeus reddish brown; pronotum brown blackish, laterally broadly orangebrown, anterior and posterior margin orange translucent; elytra dark brown, paler laterally, base with distinct, orange, comb-like shaped transverse band reaching neither lateral margin nor suture; appendages orange-brown; ventral side brown blackish. Head. Moderately broad, ca. 0.63× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present at frontal level of eyes, and antero-laterally to eyes in fronto-clypeal depressions; fine punctures smaller and sparser on clypeus, becoming larger and more dense posteriorly. Pronotum. Transverse (width/length ratio = 2.69), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading very thin and indistinct. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, laterally close to sides, several punctures present also in shallow baso-lateral depressions along basal margin.Pronotum baso-laterally and especially laterally with irregular wrinkles and very few short longitudinal strioles. Centre of disc with shallowly impressed medial longitudinal smooth line. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six discal and one submarginal longitudinal striae present on each elytron: striae 1 and 5 beginning slightly posteriorly to base; striae 2–4, 6 beginning at base; stria 1 longest, ending close to apex; striae 2–5 ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fourth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation not perceptible. Metaventrite with microsculpture consisting of polygonal meshes, laterally with oblique strioles; lateral parts of metaventrite (“metasternal wings”) tongue-shaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with long, oblique strioles; reticulation consisting of elongate, longitudinal or oblique polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present antero-medially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side.Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view simple, sickle-shaped, broadest at mid-length due to shallow swelling on ventral side; in apical third narrowing continuously to pointed apex (Fig. 63). Parameres moderately broad, ‘D’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 64). Female. Identical to male in habitus. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Females dimorphic; smooth form differs from male in more developed striolation laterally on pronotum; striolate form submatt, with long strioles covering pronotum and elytra except for apical fifth (Fig. 24). Variability. All specimens of the type series are rather uniform. There is only slight variability in dorsal surface colouration, especially in extent and brightness of pale basal band on elytra. Minor variability can be seen also in number and length of strioles presenting laterally on pronotum. Measurements. TL: 4.7–5.5 mm (mean value: 5.3 ± 0.2 mm); holotype: 5.0 mm. TL-h: 4.2–5.1 mm (mean value: 4.8 ± 0.2 mm); holotype: 4.5 mm. MW: 2.3–2.8 mm (mean value: 2.6 ± 0.1 mm); holotype: 2.5 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. tengchongensis sp. nov. in the C. japonicus complex. Within the complex, the new species can be undoubtedly recognised only based on the shape of male genitalia: C. tengchongensis sp. nov. is characteristic with the median lobe broadest in midpart and the apical part only slightly narrowing to apex (Fig. 63). Etymology. The new species is named after its area of occurrence – Tengchong County, where both known localities of the species lie. The specific epithet is an adjective in the nominative singular. Distribution. The species is so far known only from two close localities on western side of the Gaoligong mountains, western Yunnan, China (Fig. 83).

Copelatus diversistriatus Jiang, Hájek & Jia, sp. nov. (Figs 5–6, 37–38) Type locality. China, Yunnan Province, Pu’er City, Laiyanghe, Xinzhai village, ca. 22°37′52″N 101°07′55″E; 1487 m. Type material. Holotype, ♂ (SYSU), labelled: “ CHINA: Yunnan Province / Pu’er City, Laiyanghe / Xinzhai Village / 22.631N, 101.132E / 1487 m, 21.v.2011 / Keqing Song leg. [p] // HOLOTYPE / COPELATUS / diversistriatus sp. nov. / Jiang, Hájek & Jia det. 2021 [red label, p]”. Paratypes: 2 ♀, same label data as holotype (SYSU); 1 ♂, labelled: “ China: Yunnan, Lai yang he / Xin zhai, 1481m, 21.v.2011, / N22.63161 E101.13255, / S. Keqing (IRS 1399) [p] // DNA / M.Balke / 6587 [p, green typing]” (ZSMG); 1 ♂, labelled: “ YUNNAN 1500-2500m / 25.22N 98.49E 17-24.5 / GAOLIGONG mts. / Vít Kubáň leg. 1995 [p]” (ZSMG); 6 ♂, 11 ♀, labelled: “ China, Yünnan prov.; / Gaoligong Shan; 2800m a.s.l. / ca 30km E Tengchong; meadow / holokren [Sic!] spring, muddy pools / 24.10.1999, leg. J. Šťastný [p]” (JSCL); 1 ♀, labelled: “ CHINA: Yünnan, Xishuangbanna / ca. 10km NW Menglun / 7.11.1999, ca. 700 m / leg. Jäch, et al. (CWBS 359) [p]” (NHMW); 2 ♂, 8 ♀, labelled: “ CHINA: Yünnan, Xishuangbanna / ca. 10km NW Menglun / 7.11.1999, ca. 700 - 800 m / leg. Jäch, et al. (CWBS 360) [p]” (NHMW); 3 ♂, labelled: “ CHINA: Yunnan province, / REHAI hot springs, 5.VI. 2007 / 6 km SW of TENGCHONG, / 24°57.1′N 098°26.2′, 1400 m, / J. Hájek & J. Růžička leg. // individually collected in small / pool with clay bottom, and on / plants and shrubs margin of / grove above the rice fields [p]” (NMPC); 1 ♂, labelled: “ CHINA: Yunnan Province / Baoshan City / Gaoligong Nature Park / 24.91N, 98.81E / 1751 m, 22.v.2016 / Y. Tang & R. Zhang leg. [p]” (SYSU); 1 ♂, labelled: “ CHINA: YUNNAN Prov. / 6 km SSW Tengchong / Rehai Hot Springs / 24°56.9′N 98°26.9′E, 1445 m / J. Hájek & J. Růžička leg. // 22.vi.2016; individually from / vegetation, in artificial watering / pools and in stream; / border of ruderal and orchards [p]” (NMPC); 21 ♂, 13 ♀, labelled: “ CHINA: YUNNAN PROV. / 14 km SE Tengchong / Renjiafen env., 2025-2145 m / 24°56.0-5′N, 98°35.0-7′E, / J. Hájek & J. Růžička leg. // 23.vi.2016 / individually from pool / border of ruderal, orchards and / secondary mixed forest [p]” (IZCAS, NHRS, NMPC, SNUC, ZFMK); 1 ♂, 1 ♀, labelled: “ CHINA: YUNNAN Prov. / TONGBIGUAN env., 1340-1380 m / 24°36.0-37.0′N, 97°35.1-4′E, / J. Hájek, J. Růžička leg. // 24.-26.vi.2016; individually from / ruderal vegetation, from fungi / on dead wood, in Bos excre- / ments, in puddles near river [p]” (NMPC); 3 ♂, 5 ♀, labelled: “ CHINA: YUNNAN Prov. / 6.5- 5.2 km W Tongbiguan / 24°36.6-8′N, 97°35.5-36.4′E, / 1290-1325 m / J. Hájek & J. Růžička leg. // 25.+ 27.vi.2016; / individually from puddle, / vegetation, fungi; / broadleaved tropical forest [p]” (NMPC); 1 ♂, labelled: “ CHINA: Yunnan Province / Lvchun County / roadside ditches and terraces / 22.8856N, 102.3264E / 1443.5 m, 1.v.2021 / Z. Jiang, Z. Yang, Z. Mai & / B. Huang leg. [p]” (SYSU). All paratypes with the appropriate printed red label. Additional material examined. LAOS: 1 ♂, 1 ♀, Attapeu Prov., Annam Highlands Mts., Dong Amphan NBCA, Nong fa (crater lake) env., 15°05.9′N 107°25.6′E, 1160 m, 30.iv.-6.v.2010, J. Hájek leg. (NMPC). MYANMAR: 2 ♂, Shan State, 35 km N Aungban, 20°55.20′N 96°33.60′E, 1320 m, flight intercept trap, 31.v.-8.vi.2002 (NHMW, NMPC); 85 spec., Shan State, NE Mintaingbin Forest Camp, 20°55.640′N 96°33.634′E, 1290 m, puddles, 14.- 20.vi.2004, H. Shaverdo leg. (NHMW, NMPC); 81 spec., Shan State, SE Mintaingbin Forest Camp, forest pools and leaf litter near stream, 17.vi.2004, H. Shaverdo leg. (NHMW, NMPC); 52 spec., Mandalay Reg., Mogok Township, S Panlin vill., W slopes of Mt. Taung Mae, ca. °58′09.7″N 96°27′11″E, 1710 m, 12.vi.2014, H. Schillhammer leg. (NHMW). THAILAND: 1 ♀, Nakhon Ratchasima Prov., Khao Yai NP, 8.-10.xii.2011, J. Šťastný leg. (ZSMG); 1 ♂, Phitsanulok Prov., Nakhon Thai Distr., Phu Hin NP, Rong Kla, 16°59′49.1″N 101°00′34.8″E, in waterfall, 7.iii.2016, A. Damaška leg. (NMPC). See the Variability section. Description of male holotype. Habitus (Fig. 5) oblong oval, with continuous outline, broadest in anterior 1/3 of elytral length, slightly convex. Dorsal surface shiny. Colouration. Head dark brown, clypeus and two oval spots on vertex rufous; pronotum dark brown, laterally broadly orange; elytra brown, laterally somewhat paler, with moderately broad, irregularly shaped, basal orange band not reaching suture; appendages orange-brown; ventral side dark brown to black. Head. Moderately broad, ca. 0.62× width of pronotum, trapezoidal. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present at frontal level of eyes, and antero-laterally to eyes in fronto-clypeal depressions. Pronotum. Strongly transverse (width/length ratio = 3.03), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading very thin and indistinct. Reticulation similar to that of head. Punctation double; rows of coarse setigerous punctures present along anterior margin, close to lateral sides, several punctures present also in shallow baso-lateral depressions along basal margin; fine puncture smaller and sparser than on head, spread throughout whole surface. Pronotum, except for centre of disc, with numerous, irregularly distributed short longitudinal or oblique strioles. Centre of disc with shallowly impressed median longitudinal smooth line. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Ten discal and one submarginal longitudinal striae present on each elytron: all striae beginning more or less at base; striae 1, 3, 5, 7, 9–10 complete; stria 1 longest, ending close to apex; striae 3, 5, 7, 9 somewhat shorter, ending subapically, stria 10 ending at apical fourth; striae 2, 4, 6 short, presented only in basal third of elytral mid-length, apically usually fragmented into several short strioles; stria 8 shortest, present only in basal fourth of elytra; submarginal stria long, beginning at elytral mid-length and ending at apical fourth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation consisting of shallow, hardly perceptible polygonal meshes. Metaventrite with microsculpture consisting of polygonal meshes; lateral parts of metaventrite (“metasternal wings”) tongue-shaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with long, longitudinal strioles; reticulation consisting of elongate, oblique polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures; coarse setigerous punctures present medially on ventrite III, and medio-laterally on ventrite VI. Male genitalia. Median lobe of aedeagus in lateral view sickle-shaped; broad in basal three quarters, slightly narrowing in apical quarter; curved in basal third, then almost parallel-sided until apical quarter, and then curved to obtusely pointed apex (Fig. 37); lateral carina of median lobe with small spines in apical half (Fig. 37 aa). Parameres moderately broad, ‘C’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 38). Female. Identical to male in habitus. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Short irregular strioles present between stria 1 and lateral margin in anterior third of elytra in some specimens. Variability. The specimens of the new species vary slightly in dorsal surface colouration, especially in extent of orange basal elytral band, which may be comb-like shaped. The specimens vary also in extent of striolation on pronotum. However, the most apparent variability is in the elytral striation: short striae 2, 4, 6, 8 vary in length, occupying from one fourth to nearly a half of elytral length; those striae may be also fragmented into several short strioles, or partly or completely reduced, thus the beetles have only six dorsal elytral striae (see below). On the other hand, several short strioles may present between regular striae. While most of the specimens from Yunnan and specimens from central Thailand agree with the holotype in the elytral striation, one population from Yunnan (6.5– 5.2 km W Tongbiguan) and the specimens from southern Laos have the even elytral striae 2, 4, 6, 8 partly reduced, and the majority of specimens from Myanmar have elytra with six discal striae only (Fig. 6). The male genitalia are identical in all studied specimens. Although we have no doubts that all material belongs to one nominal species, due to the large variability between populations and extended area of distribution, we have decided to exclude the specimens from outside Yunnan province, China from the type material. Measurements. TL: 4.7–5.5 mm (mean value: 5.2 ± 0.2 mm); holotype: 5.2 mm. TL-h: 4.3–5.0 mm (mean value: 4.7 ± 0.2 mm); holotype: 4.8 mm. MW: 2.3–2.8 mm (mean value: 2.6 ± 0.1 mm); holotype: 2.6 mm. Differential diagnosis. Based on the presence of 10 dorsal striae and a submarginal stria on each elytron, the new species can be classified within the C. erichsonii Guérin-Méneville species group. This large group is in the Oriental region represented with only three species from India and Indonesia respectively (Nilsson & Hájek 2022a). From all these species, C. diversistriatus sp. nov. clearly differs in the short even elytral striae 2, 4, 6 and 8. However, the reduction of elytral striae to six indicates that C. diversistriatus sp. nov. is in fact more closely related to species of the C. japonicus Sharp complex in the C. irinus species group. This fact is confirmed with the molecular analysis (M. Balke et al., unpublished data).The similar reduction of elytral striae was recently documented and discussed by Manuel et al. (2018) in Neotropical Copelatus. Within the members of the C. japonicus complex, the specimens of the new species with six dorsal striae on each elytron can be undoubtedly recognized only based on the median lobe of male genitalia, which is simple, sickle-shaped, broad in basal three fourths, and then slightly narrowed to obtusely pointed apex. Collection details. Copelatus diversistriatus sp. nov. was collected predominantly in small temporary pools or ditches with muddy bottom, both densely vegetated and without any vegetation (Fig. 73). In western Yunnan, it was repeatedly collected syntopically with C. malaisei Guignot, 1954. Etymology. The species name is composed from the Latin adjectives diversus (-a, -um) (= diverse), and striatus (-a, -um) (= with striae), referring to the diverse length of odd and even elytral striae. Distribution. Widely distributed species, recorded from southwest China (southern Yunnan) (Fig. 81), neighbouring Shan State in eastern Myanmar, as well as Mandalay Region in central Myanmar, central Thailand (Nakhon Ratchasima and Phitsanulok provinces) to southern Laos (Attapeu province).

Copelatus mopanshanensis Jiang, Zhao & Hájek sp. nov. (Figs 12, 45–46) Type locality. China, Yunnan Province, Xinping Yi and Dai Autonomous County, Mopan Mountain National Forestry Park, 23°56′18.71″N 101°59′17.16″E, ca. 2520 m. Type material. Holotype ♂ (ZSMG), labelled: “ China: Yunnan, Mo Pan shan / Liao Wa Ta, 2526m, 19.v.2011 / 23.93853 N 101.98810 E, Song / Keking M (1398) [p] // DNA / M.Balke / 6576 [p, green typing] // HOLOTYPE / COPELATUS / mopanshanensis sp. nov. / Jiang, Zhao & Hájek det. 2021 [red label, p]”. Paratypes: 1 ♂, 1 ♀, same label data as holotype (NMPC, ZSMG); 1 ♂, 3 ♀, labelled: “ CHINA: Yunnan Province / Mopanshan Mt., Yuelianghu / 23.947N 101.965E / 1973 m, 19.v.2011 / Keqing Song leg. [p]” (SYSU). All paratypes with the respective paratype label. Description of male holotype. Habitus (Fig. 12) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, convex. Dorsal surface shiny. Colouration. Head brownish black, clypeus and two oval spots on vertex reddish brown; pronotum brownish black, laterally broadly orange-brown, anterior and posterior margin somewhat orange-brown translucent; elytra brown, lateral sides and base indistinctly paler – orange-brown; appendages orange-brown; ventral side brownish black. Head. Moderately broad, ca. 0.61× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present also in fronto-clypeal depressions; fine punctures smaller and sparser on clypeus, becoming larger and more dense posteriorly. Pronotum. Transverse (width/length ratio = 2.76), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading thin but distinct, except for anterior angles. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, laterally close to sides, several punctures present also in shallow baso-lateral depressions along basal margin. Pronotum without strioles, surface baso-laterally only with indistinct wrinkles. Centre of disc with shallowly impressed medial longitudinal groove. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six complete discal and one submarginal longitudinal striae present on each elytron: striae 2–4 beginning at base, striae 1, 5–6 beginning slightly posteriorly to base; stria 1 longest, ending close to apex; striae 2–5 somewhat shorter, ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fifth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation not perceptible. Metaventrite with microsculpture consisting of polygonal meshes, laterally with oblique strioles; lateral parts of metaventrite (“metasternal wings”) tongue-shaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with short oblique strioles; reticulation consisting of elongate, oblique, polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present medially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side. Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view sickle-shaped, broad in basal two thirds of its length, with bulge on ventral side in two thirds; apical third slender, bisinuous, apex obtusely pointed (Fig. 45). Parameres moderately broad, ‘D’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 46). Female. Identical to male in habitus. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Pronotum baso-laterally with several irregular longitudinal strioles. Very short and sparse irregular strioles present between striae in basal half of elytra. Variability. In addition to differences of female described above, no substantial variability can be seen in the limited number of specimens available to us. Measurements. TL: 5.3–5.8 mm (mean value: 5.6 ± 0.2 mm); holotype: 5.8 mm. TL-h: 4.8–5.4 mm (mean value: 5.0 ± 0.2 mm); holotype: 5.4 mm. MW: 2.6–2.9 mm (mean value: 2.8 ± 0.1 mm); holotype: 2.9 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. mopanshanensis sp. nov. in the C. japonicus complex. Within the complex, the new species can be undoubtedly recognised only based on the shape of male genitalia: median lobe is broad in basal two thirds; apical part is slenderer, bisinuous. The most similar genitalia are those of Copelatus felicis sp. nov., but the median lobe is broader and with distinct swelling on ventral side in three fourths of its length, and the apical part is slenderer in the latter species (see Figs 35 and 45). Etymology. The species is named after the Mopan Shan mountains where it was collected. The specific epithet is an adjective in the nominative singular. Distribution. A species endemic to China, so far known only from two very close localities in Mopan Shan mountains in central Yunnan (Fig. 82)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 262-264, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696

Copelatus rosulae Hájek, Jiang, & Jia sp. nov. (Figs 20, 57–58) Type locality. China, Yunnan Province, Lushui County, Pianma Township, ca. 26°01′N 98°37′E, 1900 m. Type material. Holotype ♂ (SYSU), labelled: “ 云南省泸水县片Ljdz / 26.01N 98.62E / 1908m 2016-V-19 / 唐余丹 张 Ṅae // CHINA: Yunnan Province / Lushui County / Pianma Township / 26.01N, 98.62E / 1908 m, 19.v.2016 / Y. Tang & R. Zhang leg. [p] // HOLOTYPE / COPELATUS / rosulae sp. nov. / Hájek, Jiang & Jia det. 2021 [red label, p]”. Paratypes: 12 ♂, 17 ♀, same label data as holotype (SYSU); 1 ♀, labelled: “ CHINA: Yunnan Province / Lushui County / Pianma Township, S316 / 25.9956N, 98.6548E / 2504.9 m, 15.v.2021 / Z. Jiang, Z. Yang & Z. Mai leg. [p]” (SYSU); 7 ♂, 6 ♀, labelled: “ CHINA: YUNNAN Prov. / Gaoligong Mts NNR / E of Kongshu vill., 2035-2230m / 25°43.2-5′N, 98°34.4-40.0′E / J. Hájek & J. Růžička leg. [p] // 1.vii.2016; pasture / individually from densely / vegetated pool near river [p]” (JSCL, NHMW, NMPC, ZSMG). All paratypes with the respective paratype label. Description of male holotype. Habitus (Fig. 20) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, slightly convex. Dorsal surface shiny. Colouration. Head dark brown, clypeus reddish brown; pronotum brown blackish, laterally broadly orangebrown; elytra dark brown, base with rather indistinct, orange brown transverse band not reaching suture; appendages orange brown; ventral side brown blackish. Head. Moderately broad, ca. 0.63× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present at frontal level of eyes, and antero-laterally to eyes in fronto-clypeal depressions; fine punctures smaller and sparser on clypeus, becoming larger and more dense posteriorly. Pronotum. Transverse (width/length ratio = 2.82), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading thin but distinct except for anterior angles. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, laterally close to sides, several punctures present also in shallow baso-lateral depressions along basal margin. Pronotum basolaterally and especially laterally with irregular wrinkles and several short longitudinal strioles. Centre of disc with shallowly impressed medial longitudinal smooth line. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six discal and one submarginal longitudinal striae present on each elytron: stria 1 fragmented in basal fourth, ending close to apex; striae 2–4, 6 beginning at base; stria 5 beginning slightly posteriorly to base; striae 2–5 ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fourth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation not perceptible. Metaventrite with microsculpture consisting of polygonal meshes, laterally with elongate strioles; lateral parts of metaventrite (“metasternal wings”) tongue-shaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with short, oblique strioles; reticulation consisting of elongate, longitudinal or oblique polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present antero-medially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side.Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view simple, sickle-shaped, continuously narrowing to pointed apex (Fig. 57). Parameres moderately broad, ‘D’-shaped; apex short and broad; apical lobes long, clubshaped (Fig. 58). Female. Identical to male in habitus. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Females dimorphic; smooth form differs from male in more developed striolation laterally on pronotum; striolate form submatt, with long but rather fine and sparsely distributed strioles in basal two thirds of elytra. Variability. All specimens of the type series are rather uniform. There is only slight variability in dorsal surface colouration, especially in extent and brightness of pale basal band on elytra. Minor variability can be seen also in number and length of strioles presenting laterally on pronotum. Elytral stria 1 is complete (beginning at base) in some specimens, but it is fragmented or absent up to mid-length of elytra in other specimens. Measurements. TL: 5.1–5.9 mm (mean value: 5.5 ± 0.2 mm); holotype: 5.6 mm. TL-h: 4.7–5.1 mm (mean value: 4.9 ± 0.1 mm); holotype: 5.1 mm. MW: 2.5–2.8 mm (mean value: 2.7 ± 0.1 mm); holotype: 2.7 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. rosulae sp. nov. in the C. japonicus complex. Within the complex, the new species can be undoubtedly recognised only based on the shape of male genitalia: with the shape of simple slender arc, the median lobe of the new species is very similar to that of C. malaisei, however, the arc is deeper in the C. rosulae sp. nov., and the narrowing apical part is longer and slenderer with pointed apex turned distinctly dorsally (see Figs 41 and 57). In addition, most of the specimens of C. rosulae sp. nov. have elytral stria 1 fragmented or absent at the base, while all specimens of C. malaisei have elytral stria 1 complete (beginning at elytral base); striolate females of C. rosulae sp. nov. have sparsely distributed shorter strioles in basal two thirds of elytra, while all studied females of C. malaisei have densely distributed longer strioles on pronotum and elytra except for the apex. Collection details. The specimens from Kongshu were collected in a deep, exposed pool near the river; the diameter of the pool was ca. 3 m, littoral was densely vegetated, bottom muddy (Fig. 77). Etymology. The species is dedicated to Jan Růžička (Praha, Czech Republic), a specialist on Silphidae and Leiodidae, who accompanied one of us (JH) on many Chinese collecting trips. The Latin noun rosula (-ae, femininum) is a translation of the surname “Růžička”, meaning “a small rose” in Czech. The specific epithet is a noun in the genitive singular. Distribution. So far known only from two close localities in Gaoligong mountains, western Yunnan, China (Fig. 82)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 269-270, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696

Copelatus tengchongensis Hájek, Jiang & Jia sp. nov. (Figs 23–24, 63–64) Type locality. China, Yunnan Province, 12 km NE Tengchong, Beihai Wetlands, Zing Hai lake env., ca. 25°07.5′N 98°33.3′E, ca. 1730 m. Type material. Holotype ♂ (NMPC), labelled: “ China, Yünnan prov. / 10 km NE Tengchong; Behai [Sic! See the type locality.] / ZingHai lake env; / small flowing pools, dense veget. / 27.10.1999, leg. J. Šťastný [p] // HOLOTYPE / COPELATUS / tengchongensis sp. nov. / Hájek, Jiang & Jia det. 2021 [red label, p]”. Paratypes: 2 ♂, 4 ♀, same label data as holotype (JSCL, NMPC); 7 ♂, 7 ♀, labelled: “ CHINA (Yunnan) / Baoshan Pref., Gaoligong Shan / 65 km NNE Tengchong 1750 m / 25°35′20″N, 98°40′21″E / (small brook at edge of sec. / mixed forest) / 27.VIII.2009 D.W.Wrase (10G) [p]” (NMPC, SYSU, ZSMG). All paratypes with the respective paratype label. Description of male holotype. Habitus (Fig. 23) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, slightly convex. Dorsal surface shiny. Colouration. Head brown blackish, clypeus reddish brown; pronotum brown blackish, laterally broadly orangebrown, anterior and posterior margin orange translucent; elytra dark brown, paler laterally, base with distinct, orange, comb-like shaped transverse band reaching neither lateral margin nor suture; appendages orange-brown; ventral side brown blackish. Head. Moderately broad, ca. 0.63× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present at frontal level of eyes, and antero-laterally to eyes in fronto-clypeal depressions; fine punctures smaller and sparser on clypeus, becoming larger and more dense posteriorly. Pronotum. Transverse (width/length ratio = 2.69), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading very thin and indistinct. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, laterally close to sides, several punctures present also in shallow baso-lateral depressions along basal margin.Pronotum baso-laterally and especially laterally with irregular wrinkles and very few short longitudinal strioles. Centre of disc with shallowly impressed medial longitudinal smooth line. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six discal and one submarginal longitudinal striae present on each elytron: striae 1 and 5 beginning slightly posteriorly to base; striae 2–4, 6 beginning at base; stria 1 longest, ending close to apex; striae 2–5 ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fourth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation not perceptible. Metaventrite with microsculpture consisting of polygonal meshes, laterally with oblique strioles; lateral parts of metaventrite (“metasternal wings”) tongue-shaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with long, oblique strioles; reticulation consisting of elongate, longitudinal or oblique polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present antero-medially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side.Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view simple, sickle-shaped, broadest at mid-length due to shallow swelling on ventral side; in apical third narrowing continuously to pointed apex (Fig. 63). Parameres moderately broad, ‘D’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 64). Female. Identical to male in habitus. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Females dimorphic; smooth form differs from male in more developed striolation laterally on pronotum; striolate form submatt, with long strioles covering pronotum and elytra except for apical fifth (Fig. 24). Variability. All specimens of the type series are rather uniform. There is only slight variability in dorsal surface colouration, especially in extent and brightness of pale basal band on elytra. Minor variability can be seen also in number and length of strioles presenting laterally on pronotum. Measurements. TL: 4.7–5.5 mm (mean value: 5.3 ± 0.2 mm); holotype: 5.0 mm. TL-h: 4.2–5.1 mm (mean value: 4.8 ± 0.2 mm); holotype: 4.5 mm. MW: 2.3–2.8 mm (mean value: 2.6 ± 0.1 mm); holotype: 2.5 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. tengchongensis sp. nov. in the C. japonicus complex. Within the complex, the new species can be undoubtedly recognised only based on the shape of male genitalia: C. tengchongensis sp. nov. is characteristic with the median lobe broadest in midpart and the apical part only slightly narrowing to apex (Fig. 63). Etymology. The new species is named after its area of occurrence – Tengchong County, where both known localities of the species lie. The specific epithet is an adjective in the nominative singular. Distribution. The species is so far known only from two close localities on western side of the Gaoligong mountains, western Yunnan, China (Fig. 83)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 272-273, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696

Copelatus malaisei Guignot, 1954 (Figs 9–10, 41–42) Copelatus malaisei Guignot, 1954: 566. Type locality. “Kambaiti” [ Myanmar, Kachin State, Kambaiti Pass, ca. 25°24′N 98°09′E]. Type material. Holotype ♂ (NHRS), labelled: “N. E. BURMA / Kambaiti. 7000 ft. [p] / 5/4 1934 [hw] / R. MALAISE [p] // 5684 / E91 + [blue label, p] // Type [red label with black frame, p] // F. Guignot det., 19 [p] 53 [hw] / Copelatus / malaisei Guign / Type ♂ [hw] // NHRS-JLKB / 000027122”. Allotype ♀ (NHRS), labelled: “N. E. BURMA / Kambaiti. 7000 ft. [p] / 8/4 1934 [hw] / R. MALAISE [p] // 5685 / E91 + [blue label, p] // Allotype [red label with black frame, p] // F. Guignot det., 19 [p] 53 [hw] / Copelatus / malaisei Guign / Allotype ♀ [hw] // NHRS-JLKB / 000027123”. Additional material examined. CHINA: Yunnan: 1 ♂, Gaoligong Mts., 24.57N 98.45E, 2200-2500 m, 8.- 16.v.1995, V. Kubáň leg. (ZSMG); 5 ♂, 1 ♀, Gaoligong Shan Mts., 30 km E Tengchong, 2800 m, meadow, helocrene spring, muddy pools, 24.x.1999, J. Šťastný leg. (JSCL, NMPC); 1 ♂, 4 ♀, 14 km SE Tengchong, Renjiafen env., 24°56.0-5′N 98°35.0-7′E, 2025-2145 m, shallow pool with clayey bottom, 23.vi.2016, J. Hájek & J. Růžička leg. (NMPC); 10 ♂, 7 ♀, Baoshan, Gaoligong Nature Park, 24.91N 98.81E, 1751 m, 22.v.2016, Y. Tang & R. Zhang leg. (SYSU); 2 ♂, 5 ♀, Tengchong, Houqiao Town, Xintang, 25.1303N 98.2572E, 1974 m, 12.v.2021, Z. Jiang, Z. Yang & Z. Mai leg. (SYSU). Diagnosis. Larger (TL: 5.1–5.7 mm), oblong-oval species. Head brownish black, usually with reddish clypeus and two oval spots on vertex; pronotum brownish black, laterally broadly testaceous and with testaceous translucent anterior margin; elytra brown with somewhat paler base. Pronotum with only very few short longitudinal strioles laterally. Each elytron with six complete discal striae and one submarginal stria: striae 5–6 beginning slightly posteriorly from base; stria 1 longest, ending close to apex, odd striae somewhat longer than even ones; stria 6 shortest, ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fourth (Fig. 9). Median lobe of aedeagus in lateral view simple, sickle shaped, regularly curved to bluntly pointed apex (Fig. 41). Parameres moderately broad, ‘C’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 42). Females dimorphic; striolate form with whole pronotum and elytra except for apex densely covered with short irregular longitudinal strioles (Fig. 10). Collection details. At the locality Renjiafen, C. malaisei was collected in ruderal habitat, in a small (diameter ca. 1 m), temporary pool with clayey bottom and dense vegetation; the species was syntopical there, although less abundant, with C. diversistriatus sp. nov. In Tengchong, C. malaisei was found in a marsh with dense emergent water macrophytes (Fig. 79). Distribution. A species occurring in the northeastern Myanmar (Kachin State) and western Yunnan, China (Gaoligong Shan Mts.). First record from China (Fig. 81)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 260-261, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Guignot, F. (1954) Entomological results from the Swedish expedition 1934 to Burma and British India. Coleoptera: Haliplidae et Dytiscidae. Recueillis par Rene Malaise. Arkiv for Zoologi, 6 (32), 563 - 567."]}

Copelatus japonicus Sharp, 1884 (Figs 8, 39–40) Copelatus japonicus Sharp, 1884: 445. Type locality. “Kiishiu” [ Japan, Honshu Island, Wakayama Prefecture]. Type material. Syntype ♂ (BMNH), labelled: “ Copelatus / japonicus. / Type D.S. / Japan. Lewis [hw] // Type [round label with red frame, p] // Sharp Coll / 1905-313.”; Syntype ♀ (BMNH), labelled: “Kii, 1879 / Wada [hw] // Japan. / G. Lewis. / 1910–320. [p] // Copelatus / japonicus. [hw] // Copelatus / japonicus, / ♀ Sharp. / teste. D.Sharp. [hw]”. Additional material examined. CHINA: Shanghai: 1 ♂, 1 ♀, Jiading District, Jiading new town, 10.ix.2021, D. Zhou leg. (SYSU). Diagnosis. Larger (TL: 5.3–5.7 mm), oblong-oval species. Head brown, with reddish clypeus and two oval spots on vertex; pronotum brown, laterally broadly orange, anterior and posterior margin orange translucent; elytra pale brown on disc, base and lateral sides yellowish brown. Pronotum with only several short longitudinal strioles laterally. Each elytron with six complete discal striae and one submarginal stria: all striae beginning at base; stria 1 longest, ending close to apex, odd striae somewhat longer than even ones; stria 6 shortest, ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fourth (Fig. 8). Median lobe of aedeagus in lateral view simple, sickle shaped, strongly curved; broad in basal half and slender in apical half; apex pointed (Fig. 39). Parameres slender, ‘C’-shaped; apex short and broad; apical lobes moderately long, club-shaped (Fig. 40). Female similar to male; strioles on pronotum more numerous, microreticulation of pronotum and elytra slightly more impressed. Comments on the classification. This Japanese species was recorded from several Chinese provinces by various authors (see Nilsson 1995 for summary), also under the names C. chinensis and C. collocallosus which were synonymized with C. japonicus by Guignot (1952) and Satô (1985) respectively. However, the study of the type material of C. chinensis proved that it is a valid species separate from C. japonicus, while the extensive material collected recently in various localities in southern China belongs to numerous taxa new to science. At present, we are aware of only a single reliable record of C. japonicus from China – Shanghai, presented above. Distribution. A species occurring in Japan, South Korea and eastern China (Shanghai) (Fig. 81)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on page 260, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Sharp, D. (1884) The water-beetles of Japan. The Transactions of the Entomological Society of London, 1884, 439 - 464.","Nilsson, A. N. (1995) Noteridae and Dytiscidae: Annotated check list of the Noteridae and Dytiscidae of China (Coleoptera). In: Jach, M. A. & Ji, L. (Eds.), Water beetles of China. Vol. I. Zoologisch-Botanische Gesellschaft in Osterreich and Wiener Coleopterologenverein, Wien, pp. 35 - 96.","Guignot, F. (1952) Description de dytiscides inedits de la collection Regimbart. Revue Francaise d'Entomologie, 19, 17 - 31.","Sato, M. (1985) The genus Copelatus of Japan (Coleoptera: Dytiscidae). Transactions of the Shikoku Entomological Society, 17, 57 - 67."]}

Copelatus sociennus J. Balfour-Browne, 1952 (Figs 21, 59–60) Copelatus sociennus J. Balfour-Browne in Guignot, 1952: 26; Jäch & Easton 1998: 44 (Macao: Friendship Monument). Copelatus bangalorensis Vazirani, 1970: 311; Zeng 1989: 98 (Guangxi: Guilin, Yanshan; Shanghai; Yunnan: Xishuangbanna). Type locality. “ China: (Hong Kong)”. Type material. Holotype ♂ (BMNH), labelled: “833 [hw, round label] // Hong Kong / [on reverse:] 48 / 60 [hw] // Copelatus / discoideus Shp [hw] // Copelatus / japonicus / ♂ Sharp. / det. J.Balfour-Browne [hw, blue ink] // Copelatus ♂ / chinensis Rég. [hw] / J.Balfour-Browne det. [p] / Det. from Descr. [p] ii.1946 [hw] // HOLOTYPE ♂ / COPELATUS / sociennus / J.Balfour-Browne, 1952 / labelled by J. Hájek 2016 [p, red label]”. Paratypes: 1 ♂ (BMNH), labelled: “Bowring / China [hw] // 457 / 17/8/49 [hw, round label] // Copelatus / japonicus / ♂ Sharp. / det. J.Balfour-Browne [hw, blue ink] // Copelatus ♂ / chinensis Rég. [hw] / J.Balfour-Browne det. [p] / Det.from Descr. [p] ii.1946 [hw]”; 1 ♂ (BMNH), labelled: “Bowring / China [hw] // 457 / 7/8/53 [hw, round label] // Copelatus /? chinensis Rég. [hw] / J.Balfour-Browne det. [p]”; 1 ♀ (BMNH), labelled: “Bowring / China [hw] // 457 / 9/6/52 [hw, round label]”. All paratypes provided with additional label “ PARATYPE ♂ [♀, respectively] / COPELATUS / sociennus / J.Balfour-Browne, 1952 / labelled by J. Hájek 2016 [p, red label]”. Additional material examined. CHINA: Guangdong: 3 ♂, 3 ♀, Zhuhai, Hengqin Island, 10.vii.2006, F. Jia leg. (SYSU); 4 ♀, Zhuhai, Qi’ao Island, 13.-15.vii.2005, Y. Jia leg. (SYSU); 2 ♂, Zhuhai, back mountain of Sun Yat-Sen University, 5.-8.vii.2011, F. Jia leg. (SYSU). Guangxi: 6 ♂, 9 ♀, Jingxi, Bangliang Nature Reserve, 6.viii.2010, J. Huang leg. (SYSU); 1 ♂, Shiwandashan National Forest Park, 21°54.4′N 107°54.2′E, 300 m, pool, 5.-9.iv.2013, M. Fikáček, J. Hájek & J. Růžička leg. (NMPC); 1 ♂, Du’an County, Sanzhiyang Township, Keli vill., 24.vi.2013, Tian, Lin, Yin, Huang leg. (SYSU). Hainan: 1 ♂, 3 ♀, 6 km W Dongxing, 50 m, 25.i.1996, M. Jäch leg. (NHMW). Macao: 1 ♂, Coloane Isl., Siac Pai Van Agric. Park, 19.iii.1998, E. Easton leg. (NHMW); 1 ♀, Cotai Ecological Zone, 5.vii.2017, F. Jia leg. (SYSU); 1 ♂, Cotai Ecological Zone, 10.x.2020, F. Jia & W. Xie leg. (SYSU). Yunnan: 3 ♀, Xishuangbanna, xii.1985 (SYSU). Diagnosis. Larger (TL: 5.2–6.1 mm), broadly oblong-oval species. Head dark brown, clypeus and anterior part of frons usually paler, reddish; pronotum dark brown, laterally broadly reddish; elytra dark brown, with broad, comblike shaped, basal orange band not reaching suture, band confluent with orange-brown lateral part of elytra usually laterally from stria 3, apical fifth of elytra orange-brown. Pronotum with short longitudinal strioles laterally. Each elytron with six complete discal striae and one submarginal stria: all striae beginning at base; stria 1 and 4 ending close to elytral apex; striae 2–3 and 5 ending subapically; stria 6 shortest, ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fourth (Fig. 21). Median lobe of aedeagus in lateral view sickle-shaped with apex slightly turned dorsally, near mid-length with broad spoon-like process on dorsal side and finger-like process on ventral side (Fig. 59). Parameres broad, ‘D’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 60). Female similar to male, microreticulation of dorsal side slightly more impressed. Collection details. The single specimen from Shiwandashan (Guangxi) was collected in a small pool of artificial stream in the resort; specimens from Hainan were found in roadside rainwater ditches and small man-made ground water pool in rubber plantation (Jäch & Ji 1998). Distribution. A species occurring in the Indian subcontinent (especially in the Himalayan Area), China and continental Southeast Asia. In China, it is recorded from southern and eastern part of the country (Guangxi, Hong Kong, Macao, Shanghai, Taiwan, Yunnan). First records from Guangdong and Hainan (Fig. 83)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on page 271, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Guignot, F. (1952) Description de dytiscides inedits de la collection Regimbart. Revue Francaise d'Entomologie, 19, 17 - 31.","Jach, M. A. & Easton, E. R. (1998) Water beetles of Macao (Coleoptera). In: Jach, M. A. & Ji, L. (Eds.) Water beetles of China. Vol. II. Zoologisch-Botanische Gesellschaft in Osterreich and Wiener Coleopterologenverein, Wien, pp. 43 - 50","Vazirani, T. G. (1970) Contributions to the study of aquatic beetles (Coleoptera). VII. A revision of Indian Colymbetinae (Dytiscidae). Oriental Insects, 4 (3), 303 - 362. https: // doi. org / 10.1080 / 00305316.1970.10433967","Zeng, H. (1989) Classification of Dytiscidae (Insecta: Coleoptera) - A study of the collections of Dytiscidae from major museums in China. Unpublished PhD Thesis, Department of Biology, University of Sun Yat-sen University, Guangzhou, 152 pp. [in Chinese with English abstract]","Jach, M. A. & Ji, L. (1998) China water beetle survey (1995 - 1998), pp. 1 - 23. In: Jach, M. A. & Ji, L. (Eds.) Water beetles of China. Vol. II. Zoologisch-Botanische Gesellschaft in Osterreich and Wiener Coleopterologenverein, Wien, 371 pp."]}

Copelatus puzhelongi Jiang, Hájek & Jia sp. nov. (Figs 17–18, 53–54) Type locality. China, Yunnan Province, Pu’er City, Laiyanghe Nature Reserve, ca. 22°36.4′N 101°00.4′E. Type material. Holotype ♂ (SYSU), labelled: “ 云南Ḃ洱ǨÑ河保护区 / 2007.VII.29 / Āφ人:DZṂ AE // CHINA: Yunnan Province / Pu’er City / Laiyanghe Nature Reserve / 29.vii.2007, Fenglong Jia leg. [p] // HOLOTYPE / COPELATUS / puzhelongi sp. nov. / Jiang, Hájek & Jia det. 2021 [red label, p]”. Paratypes: 4 ♂, 4 ♀, same data as holotype (NMPC, SYSU); 1 ♀, labelled: “ China: Yunnan Prov. / Nabanhe N. R. / Bengganghani / Shanshenmiao / N22.08.450 E100.35.289 [p] // Alt. 1750m / 12-XI-2008 / HU Jia-Yao & / TANG Liang leg. [p]” (SNUC); 1 ♂, labelled: “ China: Yunnan Prov. / Nabanhe N. R. / Shanshenmiao / Bengganghani / alt. 1700m, 27-IV-2009 / Jia-Yao Hu & / Zi-Wei Yin leg. [p]” (SNUC); 2 ♂, labelled: “ China: Yunnan Prov. / Nabanhe N. R. / Chuguohe / Bengganghani [p] // alt. 1750m, 28-IV-2009 / Jia-Yao Hu & / Zi-Wei Yin leg. [p]” (NMPC, SNUC); 1 ♂, 2 ♀, labelled: “ CHINA: Yunnan Province / Lvchun County / Huanglianshan Reservoir / 22.8898N 102.2952E / 1717.3m, 30.iv.2021 / Z. Jiang, Z. Yang, Z. Mai & / B. Huang leg. [p]” (SYSU); 1 ♂, 2 ♀, labelled: “NE LAOS, Hua Phan Prov. / BAN SALUEI, Phu Phan Mt. / 20°15′N 104°02′E, / 1500–2000 m, / J. Bezděk leg. 26.iv.-11.v.2001 [p]” (NMPC); 2 ♂, labelled: “ LAOS –NE, Houa Phan prov. / 20°12′01-30″ N 104°00′ / 34-55″ E, 1750-1850 m, / PHOU PANE Mt. / 8.v.2008, Vít Kubáň lgt. [p]” (NMPC); 1 ♂, 1 ♀, labelled: “LAOS-NE, Houa Phan prov., / 20°12′01-30″N 104°00′34- / 55″E, 1750-1850m, / PHOU PANE Mt. 4.+ 10.vi. / 2009, Vít Kubáň lgt. [p]” (NMPC); 1 ♂, labelled: “LAOS-NE, Xieng Khouan prov., / 19°38.20′N 103°20.20′E, / Phonsavan (30km NE), / Phou Sane Mt., 10.-30.v.2009, / 1400-1600m, V. Kubáň leg. [p]” (NMPC). 1 ♂, 1 ♀ + 6 spec., labelled: “N-Vietnam – pass 8 km / NW Sa Pa, 22°21’10’’N / 103°46’01’’E, 2010 m, / second. forest, 12.VIII. / 2013, V. Assing [7b+2]” (ZMHB); 1 ♂, labelled: “ Vietnam: Cao Bang Prov., Tinh / Tuc, Son Dong, Nui Pia Oac / Nature Reserve, 850-1300m, / 9-15.v.2014, 22°37′55″N / 105°52′98″E, A. Skale [p] // DNA / M. Balke / 6665 [p, green typing]” (ZSMG). All paratypes with the respective paratype label. Description of male holotype. Habitus (Fig. 17) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, slightly convex. Dorsal surface shiny. Colouration. Head dark brown, clypeus and two oval spots on vertex orange; pronotum dark brown, laterally broadly orange, anterior and posterior margin orange translucent; elytra orange-brown, base and lateral sides indistinctly paler, orange; appendages orange; ventral side dark brown. Head. Moderately broad, ca. 0.62× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present at frontal level of eyes, and antero-laterally to eyes in fronto-clypeal depressions; fine punctures smaller and sparser on clypeus, becoming larger and more dense posteriorly. Pronotum. Transverse (width/length ratio = 2.92), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading very thin but distinct except for anterior angles. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, laterally close to sides, several punctures present also in shallow baso-lateral depressions along basal margin. Pronotum baso-laterally and especially laterally with several, irregularly distributed short longitudinal strioles. Centre of disc with shallowly impressed medial longitudinal groove. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six discal and one submarginal longitudinal striae present on each elytron: striae 1–4 beginning at base, striae 5–6 beginning slightly posteriorly to base; stria 1 longest, ending close to apex; striae 2–5 somewhat shorter, ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fourth. Reticulation similar to that of head and pronotum. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation imperceptible. Metaventrite with microsculpture consisting of polygonal meshes; lateral parts of metaventrite (“metasternal wings”) tongueshaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with short, longitudinal strioles and some transverse wrinkles; reticulation consisting of elongate, longitudinal and oblique polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present antero-medially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side. Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view simple, sickle-shaped; in middle part almost straight on ventral side, regularly curved to bluntly pointed apex (Fig. 53). Parameres moderately broad, ‘C’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 54). Female. Identical to male in habitus. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Females dimorphic; smooth form differs from male in more developed striolation presenting laterally on pronotum; striolate form matt, one female from Pu’er with long strioles on elytra except for apical fourth (Fig. 18), females from Laos additionally with long strioles covering whole surface of pronotum. Variability. All specimens of the type series are rather uniform. There is only slight variability in dorsal surface colouration – the pale base of elytra is not perceptible in some specimens and elytra are uniformly orange-brown; some specimens are somewhat darker with elytra brown. Minor variability can be seen also in number and length of strioles presenting laterally on pronotum. Measurements. TL: 4.8–5.8 mm (mean value: 5.3 ± 0.2 mm); holotype: 5.4 mm. TL-h: 4.4–5.3 mm (mean value: 4.8 ± 0.2 mm); holotype: 4.9 mm. MW: 2.2–2.9 mm (mean value: 2.6 ± 0.1 mm); holotype: 2.7 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. puzhelongi sp. nov. in the C. japonicus complex. Within the complex, the new species can be undoubtedly recognised only based on the shape of male genitalia: with the shape of simple slender arc, the median lobe of the new species is very similar to that of C. malaisei, however, the arc is shallower and in middle part almost straight on ventral side (see Figs 41 and 53). Etymology. The new species is dedicated to the late Dr. Zhelong Pu (SYSU), the founder of aquatic beetle taxonomy in China. The specific epithet is a noun in the genitive singular. Distribution. This species is so far known from the border area between China (southern Yunnan) (Fig. 82), Laos (Houaphanh and Xiangkhouang provinces) and Vietnam (Lao Cai province)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 267-268, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696

Copelatus dentatipenis Jiang, Hájek & Jia, sp. nov. (Figs 4, 33–34) Type locality. China, Jiangxi Province, Jinggangshan Mts., Pingshuishan Mt., ca. 26°30.4′N 114°06.9′E; 1590 m. Type material. Holotype, ♂ (SYSU), labelled: “ 江M井LJ山平水山 / 28.IV.2011 / Āφ人:fl爽 // CHINA: Jiangxi Province / Jinggangshan Mts. / Pingshuishan Mt. / 26°27’1”N, 114°21’14”E [Sic! See the type locality.] / 1768 m, 28.iv.2011 / Shuang Zhao leg. [p] // HOLOTYPE / COPELATUS / dentatipenis sp. nov. / Jiang, Hájek & Jia det. 2021 [red label, p]”. Paratypes: 4 ♂, 1 ♀, “ CHINA: Jiangxi Province / Jinggangshan Mts., Huyangta / 26°29’9”N, 114°07’3”E / 1490 m, 28.iv.2011 / Shuang Zhao leg. [p]” (SYSU); 2 ♂, 2 ♀, “ CHINA, JIANGXI prov., 28.vi.2011 / Jinggang Shan Mts. / Huyangta (fen, stream) / 26°29.9’N, 114°07.3’E, 1490 m, M. Fikáček & J. Hájek ” (NMPC, ZSMG); 1 ♂, “ CHINA: Jiangxi prov. / Jinggangshan Mts., Pingshui- / shan; 26°30.4’N, 114°06.9’E, / 1590 m 28.iv.2011; lgt. Fikáček, / Hájek, Kubeček, Jia, Song, Zhao // sifting; moist leaf litter in a / sparse / forest with bamboo + of mosses / (partly Sphagnum) in a dried up / fen in a low Azalea forest” (NMPC); 1 ♂, “ Kuatun (2300m) 27,40n. Br. / 117,40ö. L. J. Klapperich / 18. 3. 1938 (Fukien) [violet label, p]” (NMPC); 1 ♀, “ Kuatun (2300m) 27,40n. Br. / 117,40ö. L. J. Klapperich / 6. 4. 1938 (Fukien) [violet label, p]” (ZFMK); 5 ♂, 3 ♀, “ CHINA: Hunan Province / Chenzhou City / Mangshan Mt., Jiangjunzhai / 24°57’1”N, 112°55’58”E / 1263.12 m, 27.viii.2020 / Zhenming Yang leg. [p]” (SYSU). All paratypes with the appropriate printed red label. Description of male holotype. Habitus (Fig. 4) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, slightly convex. Dorsal surface shiny. Colouration. Head dark brown, clypeus orange; pronotum dark brown, laterally broadly orange; elytra pale brown with broad, irregularly shaped, basal orange band reaching suture; appendages orange; ventral side dark brown. Head. Moderately broad, ca. 0.64× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present also in fronto-clypeal depressions. Pronotum. Transverse (width/length ratio = 2.75), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading very thin and indistinct. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, close to lateral sides, several punctures present also in shallow baso-lateral depressions along basal margin.Pronotum baso-laterally and especially laterally with numerous, irregularly distributed short longitudinal strioles. Centre of disc with shallowly impressed median longitudinal smooth line. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six discal and one submarginal longitudinal striae present on each elytron: all striae beginning at base; stria 1 longest, ending close to apex; striae 2–5 somewhat shorter, ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fourth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation consisting of shallow, hardly perceptible polygonal meshes. Metaventrite with microsculpture consisting of polygonal meshes; lateral parts of metaventrite (“metasternal wings”) tongue-shaped, slender. Metacoxal lines nearly complete, absent only very close to metaventrite. Metacoxal plates covered with short, longitudinal strioles and some transverse wrinkles; reticulation consisting of elongate, longitudinal polygonal meshes. Metacoxal processes rounded at posterior margin.Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present anteromedially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side. Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view sickle-shaped, narrowing in apical third to skewed, dorsally slightly extended apex; in 2/3 of its length with small tooth on ventral side (Fig. 33). Parameres moderately broad, ‘C’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 34). Female. Identical to male in habitus and sculpture. Protibia simple, not angled basally and only slightly broadened distally; pro- and mesotarsomeres not broadened, without adhesive setae. Variability. All specimens of the type series are rather uniform. There is only slight variability in number and length of strioles presenting laterally on pronotum, and in extent of basal orange band on elytra; small differences were detected also in the shape of the tooth on ventral side of male median lobe (see Figs 33a–c). Measurements. TL: 5.2–5.6 mm (mean value: 5.4 ± 0.1 mm); holotype: 5.5 mm. TL-h: 4.7–5.1 mm (mean value: 4.9 ± 0.1 mm); holotype: 5.1 mm. MW: 2.5–2.7 mm (mean value: 2.6 ± 0.1 mm); holotype: 2.7 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus Régimbart species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. dentatipenis sp. nov. in the complex of species previously reported from China under C. japonicus (see above). Copelatus dentatipenis sp. nov. is in habitus almost identical with C. chinensis from central-eastern China, it can be reliably distinguished only based on male genitalia: the median lobe of C. dentatipenis sp. nov. is comparatively broader medially, with distinct angle in 2/3 of its length on dorsal side; slender apical part is longer than in C. chinensis, and the apex is less pronounced; finally, small, but distinct tooth is present on ventral side in 2/3 of lobe length (see Figs 31 and 33). Collection details. In Jiangxi, the new species was collected in a small pool with thick layer of decaying leaves (Fig. 72), close to a small stream and marsh; in that pool, C. dentatipenis sp. nov. was associated with another copelatine Dytiscidae: Lacconectus formosanus (Kamiya, 1938). One specimen was sifted from wet moss in the marsh. Etymology. The species name is composed from the Latin adjective dentatus (-a, -um) (= toothed, with tooth), and a noun penis (penis, masculinum), referring to the median lobe of the new species having a distinct tooth. The specific epithet is a noun in the nominative singular. Distribution. Southeastern China (Fujian, Hunan and Jiangxi provinces) (Fig. 81)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 255-256, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696

Copelatus miaowangi Hájek, Jiang, & Jia sp. nov. (Figs 11, 43–44) Type locality. China, Guizhou Province, Liupanshui City Region, 10 km W Liupanshui City, Yaoshang reservoir, ca. 26°36′N 104°47′E, ca. 1820 m. Type material. Holotype ♂ (IAECAS), labelled: “ CHINA: Guizhou / 10km W Lipanshui [Sic! See the type locality.] City / 27.7.1997, ca. 1800m / leg. M. Wang (CWBS 268) [p] // HOLOTYPE / COPELATUS / miaowangi sp. nov. / Hájek, Jiang & Jia det. 2021 [red label, p]”. Paratypes: 6 ♂, same label data as holotype and the respective paratype label (NHMW, NMPC, SYSU). Description of male holotype. Habitus (Fig. 11) oblong-oval, with continuous outline, broadest in anterior 1/3 of elytral length, convex. Dorsal surface shiny. Colouration. Head brownish black, clypeus reddish brown; pronotum brownish black, laterally broadly orangebrown, anterior and posterior margin somewhat orange-brown translucent; elytra brown with moderately broad, irregularly shaped, basal orange band not reaching suture; appendages orange-brown; ventral side brown. Head. Moderately broad, ca. 0.60× width of pronotum, semicircular. Anterior margin of clypeus indistinctly concave. Antenna with antennomeres long and slender. Reticulation consisting of moderately deeply impressed polygonal isodiametric meshes. Punctation double, consisting of coarse setigerous punctures, and fine punctures spread sparsely on surface; row of coarse punctures present alongside inner margin of eyes, several punctures present also in fronto-clypeal depressions; fine punctures smaller and sparser on clypeus, becoming larger and more dense posteriorly. Pronotum. Transverse (width/length ratio = 2.80), broadest between posterior angles, lateral margins moderately curved. Lateral sides with beading thin but distinct, except for anterior angles. Reticulation similar to that of head. Punctation similar to that of head; rows of coarse setigerous punctures present along anterior margin, laterally close to sides, several punctures present also in shallow baso-lateral depressions along basal margin. Pronotum basolaterally and especially laterally with several, irregularly distributed short longitudinal strioles. Centre of disc with shallowly impressed medial longitudinal smooth line. Elytra. Base of elytra as broad as pronotal base; lateral margins of elytra slightly diverging in basal third, then distinctly narrowing to apex. Six complete discal and one submarginal longitudinal striae present on each elytron: striae 2–4, 6 beginning at base, striae 1 and 5 beginning slightly posteriorly to base; stria 1 longest, ending close to apex; striae 2–5 somewhat shorter, ending subapically, even striae generally shorter than odd striae; stria 6 ending at apical fourth; submarginal stria long, beginning before elytral mid-length and ending at apical fifth. Reticulation similar to that of head and pronotum, but less impressed. Punctation consisting of coarse setigerous punctures and very fine sparse punctures; coarse punctures present along elytral striae and lateral margins of elytra. Legs. Protibia modified, angled near base, distinctly broadened anteriorly, club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, with four rows of adhesive setae on their ventral side; claws simple. Ventral side. Prosternum sinuate anteriorly, obtusely keeled medially. Prosternal process shortly lanceolate, in cross-section convex, apex obtuse; process distinctly bordered laterally; reticulation not perceptible. Metaventrite with microsculpture consisting of polygonal meshes, laterally with oblique strioles; lateral parts of metaventrite (“metasternal wings”) tongue-shaped, slender. Metacoxal lines nearly complete, absent only close to metaventrite. Metacoxal plates covered with short oblique strioles; reticulation consisting of elongate, oblique, polygonal meshes. Metacoxal processes rounded at posterior margin. Abdominal ventrites I–II with longitudinal strioles; ventrites III–IV with oblique strioles laterally. Tuft of setae present medially on ventrites III–V; ventrite VI with setigerous punctures laterally on either side. Abdominal reticulation consisting of elongate polygonal meshes, longitudinal on ventrites I–II, oblique on ventrite III and transverse on ventrites IV–VI. Punctation consisting of fine, sparsely distributed punctures. Male genitalia. Median lobe of aedeagus in lateral view sickle-shaped, narrowing in apical third to obtusely pointed apex; dorsal side of apical part straight, ventral side slightly concave (Fig. 43). Parameres moderately broad, ‘C’-shaped; apex short and broad; apical lobes long, club-shaped (Fig. 44). Female. Unknown. Variability. All specimens of the type series are rather uniform. Minor variability can be seen in dorsal surface colouration, especially in the shape and extent of basal elytral band. The paratypes vary also slightly in number and extent of pronotal striolation. Measurements. TL: 5.6–6.1 mm (mean value: 5.8 ± 0.1 mm); holotype: 5.8 mm. TL-h: 5.0– 5.5 mm (mean value: 5.2 ± 0.1 mm); holotype: 5.2 mm. MW: 2.8–3.0 mm (mean value: 2.9 ± 0.1 mm); holotype: 2.9 mm. Differential diagnosis. Based on the presence of six dorsal striae and a submarginal stria on each elytron, the new species can be classified within Copelatus irinus species group. Elongate habitus, complete elytral striation and male median lobe without distinct process place C. miaowangi sp. nov. in the C. japonicus complex. Based on the shape of male genitalia, the new species is very similar to C. chinensis. It is, however, distinctly bigger than the latter species; and its median lobe has the slender apical part longer (ca. 1/3 of median lobe length), with dorsal side straight and ventral side slightly concave (see Figs 31 and 43). Collection details. The specimens of the type series were collected at the Yao Shang Reservoir; the bank had mud and sand bottom, with aquatic vegetation; it was slightly polluted, surrounded by agricultural fields (Jäch & Ji 1998). Etymology. The new species is dedicated to its collector, Miao Wang (Shenyang, China). The specific epithet is a noun in the genitive singular. Distribution. So far known only from the type locality in western Guizhou, China (Fig. 81)., Published as part of Jiang, Zhuo-Yin, Zhao, Shuang, Yang, Zhen-Yu, Jia, Feng-Long & Hájek, Jiří, 2022, A review of Copelatus Erichson, 1832 of Mainland China, with description of ten new species from the japonicus complex (Coleoptera: Dytiscidae: Copelatinae), pp. 251-295 in Zootaxa 5124 (3) on pages 261-262, DOI: 10.11646/zootaxa.5124.3.1, http://zenodo.org/record/6410696, {"references":["Jach, M. A. & Ji, L. (1998) China water beetle survey (1995 - 1998), pp. 1 - 23. In: Jach, M. A. & Ji, L. (Eds.) Water beetles of China. Vol. II. Zoologisch-Botanische Gesellschaft in Osterreich and Wiener Coleopterologenverein, Wien, 371 pp."]}

Nitidula maculosa Fairmaire, 1866 (Figs 2, 5, 8, 11) Nitidula maculosa Fairmaire, 1866 in F������������������������ & C��������������������� (1866): 19 (Algeria). Nitidula mollicella Reitter, 1873: 44 (northern Africa). Material studied. ALGERIA: 4 spec., Sahara, Bou Saada, 15.x.1980, A. Olexa leg. (NMPC); 2 spec., Hammam Rhira, ex coll.J. Hlisnikowski (NMPC). ISRAEL: 1 J 1 ♀, Palestine, Jerusalem, 1931, F. S. Bodenheimer leg. (PACR), 1 spec., Palestina, Jerusalem, 24.x.1942, Hou��ka leg. (NMPC). LIBYA: 1 J, Apollonia, ix.1941 (PACR). Diagnosis. Body length: 2.3���4.1 mm. Body subparallel-sided. Antennae almost as long as width of head across eyes, antennomeres IV and V longer than wide. Anterior margin of pronotum subtruncate. Apical margin of prosternal process truncate. Pale pigmentation extended over most of elytra, black pigmentation limited to common arcuate spot behind scutellum, common spot at apex of elytra and one elongate spot behind midlength of each lateral margin (Fig. 2). Male genitalia: Median lobe of aedeagus ca. 1.8 �� longer than wide, widest at apical fourth, there lateral margins abruptly (angulately) curved towards apex (Fig. 5). Tegmen similar to that of N. carnaria, but more strongly narrowed apically (Fig. 8). Tergite VIII flatly rounded apically (Fig. 11). Distribution. Northern Africa (Algeria, Libya, Egypt) and the Middle East (Iraq, Israel, Jordan)., Published as part of Laso��, Andrzej, H��jek, Ji���� & Jel��nek, Josef, 2021, The Nitidula carnaria complex, with description of a new species from Central Asia, and a key to world species of the genus (Coleoptera: Nitidulidae), pp. 503-516 in Acta Entomologica Musei Nationalis Pragae 61 (2) on page 507, DOI: 10.37520/aemnp.2021.028, http://zenodo.org/record/5821227, {"references":["FAIRMAIRE L. & COQUEREL J. C 1866: Essai sur les coleopteres de Barbarie. Quatrieme partie. Annales de la Societe Entomologique de France, Quatrieme Serie 6: 17 - 74.","REITTER E. 1873: Systematische Eintheilung der Nitidularien. Verhandlungen des Naturforschenden Vereines in Brunn 12: 3 - 194."]}

Baeocera franzi (Löbl, 1973) Material examined. 1 ♂: Zhejiang Prov., Lin’an county, West Tianmushan Nat. Res., 30.3255°N, 119.4406°E, 430 m, (WT04) sift #02, large bamboo, bushes above Chanyuan Temple, 24.vi.2017, J. Hájek & J. Růžička leg. (NMPC). Comments. The species was described from Thailand and subsequently recorded from Fujian, Hubei, Jiangsu, Shaanxi, Sichuan and Yunnan provinces of China (L ÖBL 1999, 2003). First record from Zhejiang.

Scaphisoma binhanum (Pic, 1922) Material examined. 6 ♂♂ 9 ♀♀: Fujian Prov., Wuyishan Mts. NNR: Sangang vill., 27°45.0′N, 117°40.7′E, 720 m, river valley, mixed forest and bamboo, 24.v.–3.vi.2018, J. Hájek, D. Král, J. Růžička & L. Sekerka leg. (IZCAS, NMPC); 1 ♀: Fujian Prov., Wuyishan Mts. NNR: Guadun vill., 27°44.0–2′N, 117°38.3–7′E, 1075–1250 m, mixed forest + bamboo, on vegetation, 25. + 29.v.2018, J. Hájek, D. Král, J. Růžička & L. Sekerka leg.; 1 ♀: Fujian Prov., Wuyishan Mts. NNR, 1.3 km E Legaduc vill., Yaoyuanyu Valley, 27°43.693′N, 117°43.056′E, (W18) 640 m, sift #11, detritus along path, mixed broad-leaved forest with Cunninghamia, 28.v.2018, D. Král & J. Růžička leg. (NMPC, MHNG). Comments. The species was based on specimens coming from Vietnam, and subsequently reported from India, Nepal, Thailand, Indonesia, and China (see L ÖBL 2018b). At present, it is known from the Chinese provinces of Guangxi, Hainan and Jiangxi (L ÖBL 2019a). First records from Fujian.

Scaphisoma geminatum Löbl, 1986 Material examined. 28 spec.: Fujian Prov., Wuyishan Mts. NNR, 0.5 km SE Tongmu-Guadun, 27°43.981′N, 117°38.375′E, 1230 m, (W09) sift #05, detritus with mycelia, dense short bamboo forest with inter-mixed high evergreen trees, 25.v.2018, D. Král & J. Růžička leg. (IZCAS, NMPC); 10 spec., Fujian Prov., Wuyishan Mts. NNR, 4.8 km SW Tongmu-Sangang, Xiaofeng Mt., 27°42.707′N, 117°39.128′E, 1150 m, (W14) sift #08, detritus under dense shrubs, mixed broad-leaved forest with bamboo, 27.v.2018, D. Král & J. Růžička leg. (NMPC); 1 ♂, Fujian Prov., Wuyishan Mts. NNR, 1.3 km E Legaduc vill., Yaoyuanyu valley, 27°43.693′N, 117°43.056′E, 640 m, (W18) sift #11, detritus along path, mixed broad-leaved forest with Cunninghamia, 28.v.2019, D. Král & J. Růžička leg. (NMPC). Comments. This species was described from Meghalaya, northern India, and was subsequently reported from Fujian, Guangdong and Jiangxi provinces of China (L ÖBL 2000, 2003).

Scaphisoma sekerkai Löbl, sp. nov. (Figs 2, 5–8) Type locality. China: Fujian Prov.,Wuyishan Mts.NNR,Guadun vill.env., 27°44.6′N, 117°38.1′E, 1335 m. Type material. H OLOTYPE ♂: CHINA: FUJIAN Prov. 29.v.2018 Wuyishan Mts. NNR, Guadun vill. env., mixed forest with flowering Castanopsis, individually from vegetation, dead wood, fungi, 27°44.6′N, 117°38.1′E, 1335 m J.Hájek, D.Král, J.Růžička & L.Sekerka lgt. (IZCAS).P ARATYPES: 1 ♀: with the same data as the holotype (NMPC); 2 ♂♂ 2 ♀♀: CHINA: FUJIAN Prov. 23.v.–3.vi.2018 Wuyishan Mts.NNR:Sangang 27°45.0′N, 117°40.7′E, 720 m; mixed forest + bamboo; on vegetation Hájek, Král, Růžička & Sekerka lgt. (MHNG, NMPC). Description. Length 1.51–1.67 mm, width 0.95–1.05 mm. Head blackish. Pronotum entirely dark brown to blackish, or somewhat lighter to ochraceous along lateral margin. Hypomera ochraceous. Elytra reddish-brown, each slightly to strongly darkened along suture, with dark brown to blackish base, apices, and transverse band situated anterior to elytral midlength, latter reaching to or separated from sutural stria. Mesoventrite and metaventrite with anepisterna and epimera dark brown to blackish, ventrites light brown to yellowish, exposed abdominal tergites and appendages yellowish. Length/width ratios of antennomeres as: III 14/9: IV 28/8: V 48/8: VI 43/8: VII 50/12: VIII 42/10: IX 58/12: X 50/12: XI 60/12. Pronotum not microsculptured, with lateral margins nearly evenly rounded, lateral margin carinae exposed in dorsal view, lateral margin carinae finely and densely punctate, discal punctation fine and dense, most puncture intervals slightly larger to three times larger than puncture diameters, punctures well delimited, clearly visible at 15 times magnification. Exposed point of scutellum minute. Elytra not microsculptured, with lateral margins rounded in basal third, oblique posteriad, apical margins rounded, lateral margin carinae exposed in dorsal view, lateral margin striae finely and densely punctate, inner apical angles not prominent, about on level with outer apical angles, marginal crenulation very fine, sutural striae shallow, not or hardly bent at bases, parallel in basal halves, converging posteriad, adsutural areas flat, each with single puncture row, basal striae absent, discal punctures fairly fine and dense, coarser than pronotal or adsutural punctures, not forming rows, puncture intervals mostly about two to three times as large as puncture diameters. Exposed tergites with few very fine punctures. Hypomera with longitudinally striate microsculpture, appearing impunctate. Mesepimeron about 5 times as long as wide and 2.0 to 2.5 times as long as interval to mesocoxa. Metaventrite with transversely striate microsculpture. Median part of metaventrite weakly convex, slightly impressed apically, lacking separate impressions near metacoxae, with punctation distinct, sharply delimited, sparse on centre, fairly dense on apical area. Lateral parts of metaventrite each with dense antecoxal puncture row, punctation very fine and sparse on remaining surface. Submesocoxal area 0.04 mm long, about fourth of shortest interval to metacoxa; submesocoxal line convex, densely punctate. Metanepisterna slightly convex, impressed along arcuate suture, narrowed anteriad. Abdomen with transversely striate microsculpture.Ventrite I with few distinct basomedian punctures, very finely punctate on prevailing surface, submetacoxal area 0.08 mm long, about half of interval to apical margin of ventrite. Following ventrites very finely and sparsely punctate. Protibiae straight, mesotibiae and metatibiae weakly bent. Male characters. Protarsomeres I distinctly widened, II slightly widened, III hardly widened. Mesotarsomeres I weakly widened, II and III hardly widened.Apex of ventrite VI gradually narrowed to form about 0.05 mm long triangle. Aedeagus (Figs 5–8) 0.67–0.70 mm long. Differential diagnosis. Member of the Scaphisoma rouyeri group, as defined in L ÖBL (1981a) and subsequently extended to include species lacking parameral lobes (e.g., L ÖBL & OG AWA 2016). The species is characterized by the following features, in combination: the elytra are darkened at bases, on the transverse stripe posterior to midlength and at the apices, the elytral punctation is not arranged to form distinct striae, the sutural striae start near pronotal lobe, the submesocoxal areas are about as long as one fourth of the shortest interval between them and the metacoxae, the submetacoxal areas are twice as long as the submesocoxal areas and half as long as the shortest intervals between them and the apical margin of the ventrite I, the metaventrite has dense antecoxal puncture rows, the ventrite I is very finely punctate except for its basomedian area, the apical process of the median lobe is curved and tapering, the parameres are strongly expanded near bases and sinuate in dorsal view and lack mesal lobes, the internal sac is tubular, strigulate in proximal section, and bears rows of marginal denticles. This new species falls in the key to the Chinese Scaphisoma (L ÖBL 2019a) under the couplet 54, to S. delictum Löbl, 1981. It may be readily distinguished from the latter by the elytral colour pattern, the elytra lacking coarse puncture rows, and the parameres lacking mesal lobes. The parameres of this new species are similar to those of S. ruzickai Löbl, 2019. These two species differ notably in their elytral colour pattern and punctation (much finer in S. sekerkai sp. nov.), and the structures of the internal sac (with a median tuft of robust teeth in S. ruzickai, with long marginal rows of short denticles and a striate basal tube in S. sekerkai sp. nov.). Collection circumstances. At the type locality, Scaphisoma sekerkai sp. nov. was collected on the border of tea plantation and mixed forest with flowering Castanopsis sp. (Fig. 13); the precise collection circumstances are not known. Etymology. Patronymic. The species is named in honour of one of its collectors, the well-known leaf beetle expert Lukáš Sekerka (NMPC). Distribution. So far known only from two very close localities in the Wuyishan Mts. NNR, Fujian, China.

Kasibaeocera mussardi (Löbl, 1971) Material examined. 1 spec.: Zhejiang Prov., Lin’an county, West Tianmushan Nat. Res., 30.3255°N, 119.4406°E, 430 m, (WT04) sift #02, large bamboo, bushes above Chanyuan Temple, 24.vi.2017, J. Hájek & J. Růžička leg. (NMPC). Comments. Widely distributed Oriental species described from Sri Lanka and subsequently recorded from India, Nepal, Bhutan, China and Thailand (LÖBL 2018b).

Scaphisoma mutator Löbl, 2000 Material examined. 1 ♀: Zhejiang Prov., Lin’an County, West Tianmushan Nat. Res., 100 m SE below of top of Immortal Peak, 30.3491°N, 119.4244°E, 1470 m, (WT13) sift #07, dwarf forest, under bamboo and shrubs, near water source, 28.vi.2017, J. Hájek & J. Růžička leg. (NMPC); 1 ♀: same data but 350 m NWW of Original Temple of Lion Sect, 30.3426°N, 119.4302°E, 1190 m, (WT14) sift #13, broad-leaved deciduous forest, detritus along rocks and fallen logs near brook, 2.vii.2017 (NMPC); 1 ♂, 1 ♀: same data but 400 m N Tianmu vill., 30.3157°N, 119.4441°E, 340–350 m, (WT02) sift #01, mixed broad-leaved forest with Cunninghamia and Liquidambar near brook, 23.vi.2017 (MHNG, NMPC). Comments. This species was based on specimens found in Sichuan, and was subsequently reported from Guangdong, Guangxi and Shaanxi provinces of China (L ÖBL 2019a). First records from Zhejiang.

Neoclypeodytes fortunensis sp. nov. (Fig. 3) Type material. Holotype: m#, “ PANAMA: CHIRIQUI PROVINCE / La Fortuna: Rio Hornito Trail / 08°41.836′N, 82°13.336′W, / 1165 m; montane forest, / stream pools, 3.ix.2017 / Fikáček, Hájek, Siedel & Sekerka lgt. [p] // HO-LOTYPE m# / NEOCLYPEODYTES / fortunensis sp. nov. / K. Scheers & J. Hájek det. 2020 [p, red label]” (NMPC). Paratypes: 16 specimens; same label data as holotype (BMNH, CKSB, NMPC, ZSMG). Each paratype is provided with the appropriate red printed label. Description of male holotype. Habitus (Fig. 3A). Ovoid-shaped, slightly attenuate anteriorly and more so posteriorly; lateral outline continuous between pronotum and elytra in dorsal aspect. Surface shiny. Coloration. Head piceous. Antennae with antennomeres I–IV uniformly pale testaceous, antennomeres V–XI slightly infuscated apically. Palpi pale testaceous. Disc of pronotum dark rufous, distinctly and broadly darker piceous along anterior and posterior margins; sides pale testaceous. Elytron dark piceous with two testaceous maculae; anterior (subbasal) macula quadrangular, extending from lateral margin to one fifth of elytral width to suture, anterior margin convex, posterior margin concave; posterior macula not reaching suture, anteriorly not reaching lateral margin with emargination towards suture, posteriorly reaching lateral margin and apex of elytron; epipleuron completely testaceous. Legs including tarsi testaceous. Prosternum, mesepisterna and mesepimera rufotestaceous; metaventrite, metepisterna and metacoxae rufotestaceous, somewhat darkened at lateral portions. Abdominal ventrites rufotestaceous medially and broadly piceous anteriorly and laterally. Head with fine but distinct microreticulation anterior of occipital line; punctation consisting of fine puncture near eyes and coarser punctures on clypeus; anterior clypeal margin medially distinctly flattened; occipital line narrowly separated from posterior margin of eyes. Pronotum widest at base; lateral bead distinct; lateral margin nearly straight in basal third, very slightly round-ed in anterior two thirds; microreticulation absent; punctation consisting of punctures separated by 2–4× puncture diameter, punctation somewhat sparser laterally and distinctly denser near anterior margin; basal striae sinuate, distinctly curved inwards near base and slightly outwards anteriorly, length about 0.65× length of pronotum measured along same line as stria. Elytra with basal striae very slightly and evenly curved, slightly shorter than those on pronotum; sutural striae absent; microreticulation absent; punctation similar to that of pronotal disc, with punctures slightly larger; epipleura finely punctate, with moderately oblique humeral carina; epipleural carina not visible in dorsal view. Legs. Pro- and mesotibiae club shaped. Pro- and mesotarsomeres 1–3 slightly broadened, ventrally with adhesive setae. Metatarsomeres with well-developed natatorial setae on both sides. Ventral surface (Fig. 3B). Prosternum medially narrowly convex, coarsely sculptured; prosternal process rath-er broad, subovate with apex broadly obtuse, lateral rim indistinct. Metaventrite sparsely and rather finely punctate over entire surface, punctures separated by 2–4× puncture diameter. Intralinear space of metacoxae broad (ML/MW = 2.15), sparsely and irregularly punctate with fine punctures, punctures separated by 2–4× puncture diameter; metacoxal plates distinctly punctate with moderately coarse punctures, punctures separated by 1–3× puncture diameter, plates broadly impunctate along anterior and posterior margins.Abdominal ventrites I and II coarsely punctate; succeeding ventrites smooth with a row of setae bearing punctures along posterior margin and some sparse and fine punctures scattered over surface; ventrites IV and V with a tuft of long setae medially; ventrite VI unmodified. Male genitalia. Median lobe in ventral view broad and subparallel in basal half, slightly attenuating in third quarter of its length to short parallel subapical part, then attenuating to obtusely pointed apex (Fig. 3C); ventral surface in apical part with numerous scale-like setae (Fig. 3D). Median lobe in lateral view with ventral outline distinctly expanded medially, curved, apical third straight with lateral outline attenuating to pointed apex (Fig. 3E). Lateral lobe with apical segment elongated, very slightly curved; on inner side with numerous long setae; apex distinctly curved and protruding (Fig. 3F). Variability. There is no significant variation present in the limited number of specimens available. Sexual dimorphism. The females have the anterior clypeal margin less strongly modified but otherwise agree with the description of the male; pro- and mesotarsomeres not distinctly broadened. Measurements. TL: 1.80–2.00 mm (mean value: 1.85 ± 0.05 mm); holotype: 1.90 mm. TL-h: 1.50–1.75 mm (mean value: 1.65 ± 0.05 mm); holotype: 1.70 mm. TW: 1.00– 1.15 mm (mean value: 1.10 ± 0.03 mm); holotype: 1.10 mm. Ratio TL/TW: 1.68–1.74 (mean value: 1.72 ± 0.02). Differential diagnosis. Neoclypeodytes fortunensis sp. nov. is distinguished from N. balkei sp. nov. and N. curtulus by the color pattern (cf. Figs 1A, 2 A–B and 3A). Additionally, it differs from N. balkei sp. nov. by the male genitalia with the median lobe in lateral view expanded medially (Fig. 3E), apical part with numerous scale like setae and apex obtusely pointed in ventral view (Figs 3C, D), and the apical segment of the lateral lobe with the apex protruding and subapical incision distinct in N. fortunensis sp. nov. (Fig. 3F); from N. curtulus, it differs by the larger body size, and by the median lobe of aedeagus – in ventral view with distinct attenuation in apical fifth, and apical part less narrowed to apex in N. fortunensis sp. nov. (Fig. 3E). The new species differs from the other species in the genus by the combination of the distinctive color pattern, the absence of sutural striae, the shape of the basal pronotal and elytral striae, and the male genitalia. Due to inaccurate interpretation of elytral subbasal macula in N. curtulus as triangular (couplet 19) in the identification key of Miller (2001), the new species falls into couplet 24, together with N. fryii and N. quadrinotatus. However, based on the overall similar shape of male genitalia, N. fortunensis sp. nov. is most closely related with N. curtulus; see above for distinguishing of both species. Etymology. The new species is named after its area of occurrence – La Fortuna. The specific epithet is an adjective in the nominative singular. Collection circumstances. The specimens of the type series were collected in remnant pools of a forest streamlet (Figs 5 A–B), and among gravel in the riverbed of the larger river Rio Hornito (Fig. 5C); the two collecting sites were ca. 100 m apart. Distribution. To date only known from the type locality at the Rio Hornito in La Fortuna, Chiriqui province, Panama (Fig. 6).

Neoclypeodytes balkei sp. nov. (Fig. 1) Type material. Holotype: m#, “ Panama: Panama, Campana, / cascade below Anam office, / 270m, 19.vi.2007, / 08.40.818N 079.54.075W, / Balke (PAN 07) [p] // HOLOTYPE m# / NEOCLYPEODYTES / balkei sp. nov. / K. Scheers & J. Hájek det. 2020 [p, red label]” (ZSMG). Paratypes: 46 specimens; same label data as holotype (BMNH, CKSB, NMPC, ZSMG). Each paratype is provided with the appropriate red printed label. Description of male holotype. Habitus (Fig. 1A). Ovoid-shaped, slightly attenuate anteriorly and strongly attenuate posteriorly; lateral outline nearly continuous between pronotum and elytra in dorsal aspect. Surface shiny. Coloration. Head piceous. Antennae with antennomeres I–IV uniformly pale testaceous, antennomeres V–XI slightly infuscated apically. Palpi pale testaceous. Disc of pronotum piceous, medially slightly lightened; lateral parts of pronotum pale testaceous, broadly reaching inwards. Elytron dark piceous with two testaceous maculae; anterior (subbasal) macula subquadrangular, extending from lateral margin to one fifth of elytral width to suture, anterior margin straight with small emargination sublaterally, posterior margin largely concave with posteriorly protruding tooth near suture; posterior macula not reaching suture, anteriorly not reaching lateral margin, with concave emargination towards suture, posteriorly reaching lateral margin and apex of elytron (Fig. 1A); epipleuron completely testaceous. Legs including tarsi testaceous. Prosternum, mesepisterna and mesepimera rufotestaceous; metaventrite, metepisterna and metacoxae rufotestaceous, somewhat darkened at lateral portions. Abdominal ventrites piceous. Head with fine but distinct microreticulation anterior of occipital line; punctation consisting of fine punctures near eyes and coarser punctures on clypeus; anterior clypeal margin medially distinctly flattened; occipital line narrowly separated from posterior margin of eyes. Pronotum widest at base; lateral bead distinct; lateral margin evenly rounded; microreticulation absent; punctation consisting of punctures separated by 2–3× puncture diameter, punctation somewhat sparser laterally and distinctly denser near anterior and posterior margins; basal striae sinuated, distinctly curved inwards near base and slightly outwards anteriorly, length about 0.55× length of pronotum measured along same line as stria. Elytra with basal striae straight, about same length than those on pronotum; sutural striae absent; microreticulation absent; punctation similar to that of pronotal disc, but with punctures slightly larger; epipleura sparsely punctate, with moderately oblique humeral carina; lateral epipleural rim anteriorly visible in dorsal view. Legs. Pro- and mesotibiae club shaped. Pro- and mesotarsomeres 1–3 distinctly broadened, ventrally with adhesive setae. Metatarsomeres with well-developed natatorial setae on both sides. Ventral surface (Fig. 1B). Prosternum medially narrowly convex, coarsely sculptured; prosternal process rather broad, subovate with apex broadly obtuse, laterally margined, slightly constricted medially. Metaventrite distinctly punctate over entire surface, punctures separated by 2–4× puncture diameter. Intralinear space of metacoxa broad (ML/MW = 2.40), sparsely and irregularly punctate with fine punctures, punctures separated by 1–4× puncture diameter; metacoxal plates distinctly punctate with coarse punctures, punctures separated by 1–3× puncture diameter, plates narrowly impunctate along anterior and posterior margins. Abdominal ventrite I coarsely punctate along margins, ventrite II sparsely and finely punctate; succeeding ventrites smooth with a row of setae bearing punctures along posterior margin and some sparse and fine punctures scattered over surface; ventrites IV and V with a tuft of long setae medially; ventrite VI unmodified. Male genitalia. Median lobe in ventral view rather slender, parallel over whole length; apex distinctly truncate (Fig. 1C); ventral surface in apical part lacking scale-like setae (see under N. fortunensis sp. nov., and cf. Fig. 3D). Median lobe in lateral view broadest in apical third; ventral outline almost evenly curved; dorsal outline almost straight medially, distinctly curved inwards near apex (Fig. 1D). Lateral lobe (paramere) with apical segment elongated, nearly straight; in apical half on inner side with several long setae; apex distinctly curved but not protruding, subapical incision not perceptible (Fig. 1E). Variability. With the exception of small variability in extent and shape of elytral color pattern, there is no significant variation present within the specimens of the type series. Sexual dimorphism. The females have the dorsal surface completely reticulated with irregular polygonal meshes and thus they appear submatt; pro- and mesotarsomeres are less broadened than in males. Measurements. TL: 2.05–2.15 mm (mean value: 2.10 ± 0.03 mm); holotype: 2.15 mm. TL-h: 1.85–1.95 mm (mean value: 1.85 ± 0.04 mm); holotype: 1.95 mm. TW: 1.10–1.20 mm (mean value: 1.15 ± 0.01 mm); holotype: 1.20 mm. Ratio TL/TW: 1.73–1.82 (mean value: 1.80 ± 0.02). Differential diagnosis. Neoclypeodytes balkei sp. nov. is, together with N. curtulus and N. fortunensis sp. nov., one of only three representatives of the genus known south of Guatemala. The three species are easily distinguished from each other by the color pattern (cf. Figs 1A, 2 A–B and 3A), and the male genitalia with the median lobe parallel in ventral view, not medially expanded in lateral view (Figs 1 C–D) and lacking distinct scale-like setae at the apex (which are very distinct in both N. curtulus and N. fortunensis sp. nov.), and the apical part of the lateral lobe with appendage not protruding (Figs 1E, 2F and 3F). The new species differs from the other species in the genus by the combination of the distinctive color pattern, the absence of sutural striae, the shape of the basal pronotal and elytral striae, and the male genitalia. In the identification key of Miller (2001), the new species falls into couplet 24, together with N. fryii (Clark, 1862) and N. quadrinotatus (Sharp, 1882); from both these species, N. balkei sp. nov. differs by the posteriorly strongly attenuated habitus, more strongly punctured metacoxal plates, and by the male genitalia (cf. Figs 1 C–E, and Figs 20C–E and 21C–E in Miller (2001)). Etymology. The new species is named after Michael Balke, who collected the type series of this species. The specific epithet is a noun in the genitive case. Collection circumstances. The specimens were collected in small water holes in the bedrock around a cascade of a forest stream (M. Balke, pers. comm. 2020) (Fig. 4). At this locality, the species was co-occurring with N. curtulus. Distribution. To date the species is only known from the type locality at Campana, Panama province, Panama (Fig. 6).

Plastocerus thoracicus Fleutiaux, 1918 (Figs 1–10) Plastocerus thoracicus Fleutiaux, 1918: 236 (original description). Type locality:‘Environs de Tuyen-Quan’ [Vietnam, Tuyên Quang Province, Tuyên Quang city, ca. 21°49′N 105°13′E]. Binhon atrum Pic, 1922: 29 (original description). Type locality: Not specified in the description; ‘ Tonkin, Hoa Binh’ [Vietnam, Hoa Binh Province, Hòa Bình, ca. 20°48′N 105°20′E] based on labels under the type specimen); syn. nov. Type material. Plastocerus thoracicus: HOĿOŦΥΡΕ: ♂, not located in MNHN (A. Mantilleri, pers. comm. 2019). Binhon atrum: HOĿOŦΥΡΕ: ♀ (Figs 1, 3), labelled: ‘Hoa Binh / Tonkin [hw Pic] // type [hw Pic] // TYPE [p, red label] // Binhon / ng. / atrum Pic [hw Pic]’ (MNHN). Additional material studied. CHINA: GUΑΝǤXι: 1♂, ‘China:Kwangsi [Guangxi], Hsiangshien 1935, G. Liu.’ (ANIC; completely dissected); 1 ♀. YUΝΝΑΝ: ‘ China, Prov. / Yunnan,Gbg./ b. Mengtze.[= mountains near Mengzi]’ (NHMB). VIETNAM: 8 ♂♂, ‘Hoa / Binh [hw Pic] // ♂ de / Binhon [hw Pic]’ (MNHN); 1 ♂, ‘ Vietnam N / Tam dao 26.5.- 3.6.1986 / Vinh phu prov. / Strnad Jan lgt. [p]’ (NMPC). Diagnosis. Body elongate; total length:♂♂ 7–9 mm, ♀♀ 10– 12 mm. Colouration pitchy brownish-black; surface shiny with sparse greyish setation (Figs 1, 3). Head coarsely and irregularly punctured, distance between punctures slightly greater than puncture diameter in depression between eyes, but much less than puncture diameter in other parts of head; eyes large, hemisphaerical; antennae with 11 antennomeres: scape large, pedicel ring-shaped, antennomeres 3–10 elongate with distinct rami, antennomere 11 long and slender; male with antennomeres 3–11 increasing in length (length ratios as follows: 4.0–1.0–2.0–3.0–3.3–3.5–3.9–4.4–4.5– 5.0–12.0), rami more than twice as long as length of respective antennomere; female with antennomere 3 longer than antennomeres 4–11 which are of same length (length ratios as follows: 3.5–1.0–2.7–2.3–2.3–2.3–2.3–2.3–2.3–2.3–2.3), rami of similar length to length of respective antennomere; mandibles slender, sickle-shaped, without additional teeth. Pronotum transverse, widest at anterior third; sides distinctly sinuate and explanate, posterior angles weakly produced; posterior edge with narrow median incision; disc convex, entire surface irregularly punctate, punctures finer and sparser medially on disc, becoming coarser and denser laterally (Fig. 4). Prosternum transverse; prosternal process slender, apically slightly broadened (Fig. 5); promesothoracic interlocking mechanism weakly developed. Elytra slightly broadened in apical fourth of its length, then attenuated to rounded apex; lateral margin visible except in anterior third; surface of elytra with more or less serial, irregular shallow depressions; punctation consisting of fine setigerous punctures placed both in depressions and on raised surface between them, punctures often clustered and confluent in depression, but sparse on other surfaces with distances between punctures much greater than puncture diameter. Metathoracic wing with venation as in Fig. 6 (female from China displaying remarkable aberration in one wing with bifurcation of vein MP4, see Fig. 7; the other wing conforms with the male illustration). All legs slender; tarsi longer than tibiae, tarsomeres 1–4 decreasing in length, tarsomere 5 longest; claws simple. Male with seven ventrites (sternites III–IX), female with six ventrites; however, exposition of apical ventrite varying in both sexes. Male genitalia: aedeagus trilobate, penis narrowly acute at apex, parameres hooked subapically (Fig. 8). Female genitalia: female abdominal sternite VIII as in Fig. 9; ovipositor long, slender, barely sclerotized; paraprocts about 4.5 times as long as gonocoxites, gonostyli present (Fig. 10). The two species of Plastocerus are similar morphologically, but differ in body colouration (uniformly blackish in P. thoracicus; ochreous elytra with distinctly darker head and pronotum in P. angulosus), shape of pronotum (widest anteriorly, with explanate sides, weakly produced posterior angles and posterior median incision in P. thoracicus; widest posteriorly, with straight, converging, non-explanate sides, strongly produced posterior angles and weak posterior emargination in P. angulosus), and differences in male genitalia (apex of penis subacute with finely rounded tip, parameres broad with ventral side almost straight, apex of paramere broadly obtuse in P. thoracicus; apex of penis narrowly acute, laterally somewhat compressed, parameres slender with ventral side sinuate, apex of paramere narrowly obtuse in P. angulosus). Variability. Both the Vietnamese and Chinese specimens show slight variability in the shape of the explanate lateral part of pronotum, and in the punctation of the dorsal surface. However, with the limited material available, we consider the differences as intraspecific variability. Comments to classification. FĿΕUŦıΑUΧ (1918) described Plastocerus thoracicus based on a single male from ‘Tonkin’ (northern Vietnam), without any mention of its relationships with either the Mediterranean or American taxa. However, FĿΕUŦıΑUΧ (1940) mentioned the species in combination with Ceroplastus, linking it with the Mediterranean Plastocerus angulosus. The species is well characterised by its blackish colouration and especially the explanate medial parts of the sides of pronotum (cf. Figs 1 and 3). Unfortunately, the type specimen could not be located in the collection of MNHN (A. Mantilleri, pers. comm. 2019) thus the direct comparison of both holotypes is not possible. Nevertheless, as Binhon atrum fits completely with current concept of Plastocerus Schaum and to the description of P. thoracicus, and no other Plastocerus species is known from North Vietnam or neighbouring countries, there is little doubt that Plastocerus thoracicus and Binhon atrum are conspecific. Therefore, we establish the following new synonymies: Plastocerus Schaum, 1852 = Binhon Pic, 1922, syn. nov., and Plastocerus thoracicus Fleutiaux, 1918 = Binhon atrum Pic, 1922, syn. nov. Distribution. Plastocerus thoracicus is so far known only from northern Vietnam (provinces of Hoa Binh, Tuyên Quang and Vính Phúc), and here it is recorded for the first time from southern China (Yunnan and Guangxi)., Published as part of Hájek, Jiří, Ivie, Michael A. & Lawrence, John F., 2020, Binhon atrum Pic - a junior synonym of Plastocerus thoracicus, with nomenclatural notes on Plastocerus (Coleoptera: Elateridae: Plastocerinae), pp. 391-396 in Acta Entomologica Musei Nationalis Pragae 60 (2) on pages 393-395, DOI: 10.37520/aemnp.2020.23, http://zenodo.org/record/4489220, {"references":["FLEUTIAUX E. 1918: Coleopteres elaterides indochinois de la collection du Museum d'Histoire Naturelle de Paris. Catalogue et description des especes nouvelles. Bulletin du Museum National d'Histoire Naturelle 24: 205 - 236.","PIC M. 1922: Nouveautes diverses. Melanges Exotico-Entomologiques 36: 1 - 32.","SCHAUM H. R. 1852: Catalogus Coleopterorum Europae. Vierte Auflage. Entomologische Verein in Stettin, Berlin, v + 98 + 12 pp."]}

Plastocerus Schaum, 1852 Plastocerus Schaum, 1852: 49. Type species: Callirhipis angulosus Germar, 1844 (by monotypy). Ceroplastus Heyden, 1883 in HΕΥĐΕΝ et al.(1883:111), as an unnecessary replacement name for Plastocerus Schaum, 1852 [not Plastocerus LeConte, 1853]. Pseudophyllocerus Reitter, 1896: 234. Type species: Pseudophyllocerus atricolor Reitter, 1896 (by monotypy); synonymized by SർΗඐΑRƶ (1897: 64). Cladocerus Schwarz, 1902: 200, as an unnecessary replacement name for ‘ Plastocerus Cand. ’ [= Plastocerus sensu CΑΝĐḔƶΕ (1863); i.e. Plastocerus Schaum, not Plastocerus LeConte]. Binhon Pic, 1922: 29. Type species: Binhon atrum Pic, 1922 (by monotypy); syn. nov. Comments on the classification. The genus Plastocerus was proposed by SർΗΑUΜ (1852) in his ‘ Catalogus Coleopterorum Europae ’ for Callirhipis angulosus Germar, 1824, an enigmatic elaterid species from the Eastern Mediterranean (Greece, Turkey, Syria and Israel – see PĿΑŦıΑ & NḖΜΕŦΗ 2011). Although Schaum’s act fully conforms with the conditions of ICZN (1999: Article 12.2.5), many subsequent authors considered the genus a nomen nudum and thus formally unavailable. Most importantly of the authors who thought Schaum’s name invalid, LΕCOΝŦΕ (1853) validated a new version of the name Plastocerus, following an identification by Schaum of a newly described Californian species, Plastocerus schaumii LeConte, 1853, which led to a different, broader concept of the genus for many years. LΑർORĐΑıRΕ (1857) and CΑΝĐḔƶΕ (1863) correctly attributed Plastocerus to Schaum, but accepted LeConte’s broad definition to include both the Palaearctic and Nearctic species. Subsequently, apparently considering the Nearctic species as the ‘true’ Plastocerus, HΕΥĐΕΝ (1883) proposed a new genus name Ceroplastus for the Palaearctic taxon; unfortunately, as he did it again only in a catalogue and without description, several authors considered the name as unavailable. These authors (e.g. HΥඌĿOΡ 1921) incorrectly attributed the name Ceroplastus to SΕıĐĿıŦƶ (1888a,b), who gave a redescription of the taxon in the generic part of both his ‘ Fauna Baltica ’ and ‘ Fauna Transsylvanica ’. The female of Plastocerus angulosus was described by RΕıŦŦΕR (1896) as a new genus and species: Pseudophyllocerus atricolor Reitter, 1896; but its synonymy was soon recognized by SർΗඐΑRƶ (1897). SർΗඐΑRƶ (1902) was the first author to explicitly state that the Palaearctic and Nearctic Plastocerus species were not congeneric. He attributed the Palaearctic taxon name to CΑΝĐḔƶΕ (1863) and thus incorrectly considered it junior to LeConte’s name, so he proposed another replacement name, Cladocerus Schwarz, 1902. Schwarz’s name was immediately synonymised by HΕΥĐΕΝ (1902), who pointed out that his name Ceroplastus was senior – although he mentioned the later ‘ Catalogus coleopterorum Europae, Caucasi et Armeniae rossicae ’ (HΕΥĐΕΝ et al. 1891), and not the original ‘ Catalogus coleopterorum Europae et Caucasi ’ (HΕΥĐΕΝ et al. 1883). In addition, HΕΥĐΕΝ (1902) noted that Cladocerus Schwarz is a junior homonym of Cladocerus Kirsch, 1865: 68 (Coleoptera: Lycidae) [in fact, KıRඌർΗ (1865) described Cladoceras; Cladocerus is its unjustified emendation by GΕΜΜıΝǤΕR & HΑROĿĐ (1869: 1633)]. For the next 70 years, Plastocerus was considered to be an American genus and Ceroplastus was the genus occurring in the Old World, until CROඐඌOΝ (1972) corrected the usage: recognizing Plastocerus Schaum, with Ceroplastus as its junior synonym, for the Mediterranean species, and replaced Plastocerus LeConte with its junior synonym Octinodes Candèze, 1863. SർΗΑUΜ (1852) originally placed Plastocerus in the family Cebrionidae. However, LΑർORĐΑıRΕ (1857) included Plastocerus in the family Elateridae, where, with the single sojourn to the Rhipiceridae in HΥඌĿOΡ (1921), it remained until CROඐඌOΝ (1972) placed it in its own family, Plastoceridae. Quite recently, BOർΑκ et al. (2018) and KUඌΥ et al. (2018) revised the taxonomic placement of Plastocerus using molecular analysis and downgraded its status to the subfamily Plastocerinae, back in the family Elateridae. However, the family group name Plastoceridae Crowson, 1972 is a junior homonym of Plastocerini LeConte, 1861. Although BOUർΗΑRĐ et al. (2011) called for a petition to the International Commission on Zoological Nomenclature to suppress the LeConte name, no such petition is listed on the ICZN website, so the name is still officially invalid (https:// www.iczn.org/cases/all-cases/)., Published as part of Hájek, Jiří, Ivie, Michael A. & Lawrence, John F., 2020, Binhon atrum Pic - a junior synonym of Plastocerus thoracicus, with nomenclatural notes on Plastocerus (Coleoptera: Elateridae: Plastocerinae), pp. 391-396 in Acta Entomologica Musei Nationalis Pragae 60 (2) on page 392, DOI: 10.37520/aemnp.2020.23, http://zenodo.org/record/4489220, {"references":["SCHAUM H. R. 1852: Catalogus Coleopterorum Europae. Vierte Auflage. Entomologische Verein in Stettin, Berlin, v + 98 + 12 pp.","HEYDEN L. ඏƟΝ, REITTER E. & WEISE J. 1883: Catalogus coleopterorum Europae et Caucasi. Editio tertia. Edw. Janson, Londini; Nicolai, Berolini; Luc. Buquet, Parisiis, [2] + 228 pp.","LECONTE J. L. 1853: Revision of the Elateridae of the United States. Transactions of the American Philosophical Society, New Series 10: 405 - 508.","REITTER E. 1896: Abbildungen mit Beschreibungen zehn neuer Coleopteren aus der palearctischen Fauna. Wiener Entomologische Zeitung 15: 233 - 240 + pl. III.","SCHWARZ O. 1897: Pseudophyllocerus atricolor Reitt. = Plastocerus angulosus Germ. ♀. Deutsche Entomologische Zeitschrift 1897 (1): 64.","SCHWARZ O. 1902: Ueber die Elateriden-Gattungen Plastocerus Le Conte und Octinodes Cand. Deutsche Entomologische Zeitschrift 1901 (2): 199 - 201.","CANDEZE E. 1863: Monographie des elaterides, tome quatrieme. Memoires de la Societe Royale des Sciences de Liege 17: 1 - 534 + VI pls.","PIC M. 1922: Nouveautes diverses. Melanges Exotico-Entomologiques 36: 1 - 32.","ICZN 1999: International Code of Zoological Nomenclature. Fourth Edition. International Trust for Zoological Nomenclature, London, xxix + 306 pp.","KIRSCH T. 1865: Beitrage zur Kaferfauna von Bogota. Berliner Entomologische Zeitschrift 9: 40 - 104 + pl. III.","CROWSON R. A. 1972: A review of the classification of Cantharoidea (Coleoptera), with the definition of two new families, Cneoglossidae and Omethidae. Revista de la Universidad de Madrid 21 (82): 35 - 77."]}

Philonthus tringa Hromádka, 2013 Philonthus tringa Hromádka, 2013d: 451, Figs 154–155. The holotype is deposited in NMPC (ex coll. L. Hromádka): HƟĿƟ*´YPൾ ♀ (): ‘République Centraafricante [sic!] / Bozo lumiere / 21. v. 1981 / leg.N.Degallier [p] // ex coll.L. Hromádka / National Museum / Prague, Czech Republic [p] // HOLOTYPUS / PHILONTHUS (s. str.) / tringa sp.nov. / Hromádka, det., 2013. [p, red label]’. Current status. Valid species. Philonthus tockus Hromádka, 2012 Philonthus tockus Hromádka, 2012c: 164, Figs 69–71. Philonthus trionyx Hromádka, 2010 Two paratypes are deposited in NMPC (ex coll. L. Hro- Philonthus trionyx Hromádka, 2010e: 59, Figs 161–165. mádka): The holotype is deposited in NMPC (general collection): PA*©A*´YPൾඌ (2): ‘I.R.S.A.C.-MUS. CONGO / Kivu:T. Kalehe,Bitale / N. O. Kahusi, 1600 m [p] / (for.transit.) [hw] 29-VI-1951 / N. Leleup HƟĿƟ*´YPൾ (): ‘Tanganika: Mpala, 780 m. / VIII-1953 / H. Bomans [p] [p] // Récolté dans / l´humus [p, green label] // ex coll. L. Hromádka // ex coll. L. Hromádka / National Museum / Prague, Czech Republic / National Museum / Prague, Czech Republic [p] // PARATYPUS [p] // HOLOTYPUS / PHILONTHUS (s. str.) / trionyx sp.nov. / / PHILONTHUS (s. str.) / tockus sp. nov. / Hromádka, det. 2010 [p, Hromádka, det., 2013. [p, yellow label]’. orange label]’. Current status. Valid species. Current status. Valid species. Philonthus triseriatus Bernhauer, 1928 Philonthus torgos Hromádka, 2005 Philonthus triseriatus Bernhauer, 1928: 112. Philonthus (s.str.) torgos Hromádka, 2005: 111, Figs 18–23. One syntype is deposited in NMPC (general collection): One paratype is deposited in NMPC (ex coll. L. Hromádka): SYN*´YPൾ (unsexed specimen): ‘[one wing on a separate label] //MUSÉE PA*©A*´YPൾ (unsexed specimen): ‘ ZIMBABWE 7.-9.xii.1993 / DU CONGO [p] // Mongende / 21 [hw] / - IV-1921 /. Schouteden [p] 18°17ʹS / 32°43ʹE / Nyanga NP: Rhodes / Dam, reed +fern / sievings, // CO TYPUS [p, red label] // triseriatus / Bernh. / Cotypus. [hw]’. leg. M. Uhlig [p, blue label] // ex coll. L. Hromádka / National Muse- Current status. Philonthoblerius triseriatus (Bernhauer, um / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS 1928), see S*ö*üŪĿĸൾ & SMൾ*´ANA (2015). (s.str.) / torgos spec. nov. / Hromádka, det. 2001. [p, red label]’. Current status. Valid species, see H*©ƟMǍĐĸA (2013d). Philonthus tragelaphus Hromádka, 2009 Philonthus tragelaphus Hromádka, 2009a: 680, Figs 27–33. Four paratypes are deposited in NMPC (ex coll. L. Hromádka): PA*©A*´YPൾඌ (2): ‘REP S AFR:Cape / Prov., Knysna, / Diepwalle, 12- / XII-1981 [p] // FMHD #81-603 [sic!], / elephant / dung [sic!], S. Peck [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS(Philonth.) / tragelaphus sp. nov. / Hromádka,det.2007 [p, red label]’. PA*©A*´YPൾ (): ‘REP.SO.AFR:Cape / Prov., Knysna, / Diepwalle, 23-XII- 1981 [p] // FMHD#81-629, for. / litter, S. Peck, / berlese / FIELD MUSEUM [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS(Philonth.) / tragelaphus sp. nov. / Hromádka,det.2007 [p, red label]’. PA*©A*´YPൾ ♀)(: ‘ ♀ [p, orange label] // REP.S.AFR.: Cape / Prov., Knysna, / Diepwalle, 23.XII.1981 [p] // FMHD#81-629, for. / litter, S. Peck / FIELD MUSEUM [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (- Philonth.) / tragelaphus sp. nov. / Hromádka,det.2007 [p, red label]’.

Philonthus pandion Hromádka, 2013 Philonthus pandion Hromádka, 2013e: 231, Figs 78–81. The holotype is deposited in NMPC (general collection): HƟĿƟ*´YPൾ (): ‘ LIBERIA / Mt. Nimba / Grassfield / 16.-25.ix. 1979 [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // HOLOTYPE / PHILONTHUS s. str. / pandion sp.nov. / Hromádka det. 2009. [p, orange label]’. Current status. Valid species.

Philonthus alcelaphus Hromádka, 2011 Philonthus alcelaphus Hromádka, 2011c: 156, Figs 5–8. The holotype is deposited in NMPC (general collection): HƟĿƟ*´YPൾ (): ‘ ETHIOPIA:Bale / 8km. W.of Dinshu / 0706 N. 3444 E. / 3.050m. xii. 1971 [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // HOLOTYPUS / PHILONTHUS (s. str.) / alcelaphus sp. nov. / Hromádka, det. 2009. [p, orange label]’. Current status. Valid species.

Philonthus mabuya Hromádka, 2013 Philonthus mabuya Hromádka, 2013d: 406, Figs 73–75. The holotype is deposited in NMPC (general collection): HƟĿƟ*´YPൾ (): ‘ KENYA / M. Elgon 2380 m. Reinhardt leg. [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // HOLOTYPUS / PHILONTHUS (s. str.) / mabuya spec. nov. / Hromádka det. 2009. [p, orange label]’. Current status. Valid species.

Philonthus macronyx Hromádka, 2010 Philonthus macronyx Hromádka, 2010c: 43, Figs 53–56. Seven paratypes are deposited in NMPC (ex coll. L. Hromádka): PA*©A*´YPൾඌ (1, 1 unsexed specimen): ‘I.R.S.A.C.-MUS. CONGO / Kundelungu 1750 m. [p] / 9-III [hw] -1950 / N. Leleup [p] / (Prairie herb.) [hw] // Récolté dans / nid de / Cryptomys [p, green label] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (Philonth.) / macronyx sp. nov. / Hromádka, det. 2008. [p, red label]’. PA*©A*´YPൾඌ (2 unsexed specimens): ‘I.R.S.A.C.-MUS. CONGO / Kundelungu 1750 m. [p] / (Prairie herb.)9-III [hw] -1950 / N. Leleup [p] // Récolté dans / nid de / Cryptomys [p, green label] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (Philont.) / macronyx sp. nov. / Hromádka, det. 2008 [p, red label]’. PA*©A*´YPൾ)(: ‘COLL. MUS. CONGO / Massif des Kunde- / lungu [p] air. 1750 m. [hw] / N. Leleup [p] / (Prairie tourbeuse) 3-III-1950 [sic!] [hw] // Récolté dans [p] / terrier de / Cryptomys [hw, green label] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (Philont.) / macronyx sp. nov. / Hromádka, det. 2008 [p, red label]’. PA*©A*´YPൾ (unsexed specimen): ‘I.R.S.A.C.-MUS. CONGO / Kundelungu 1750 m. [p] / III [hw] -1950 / N. Leleup [p] / (Prairie marecag.) [hw] / M.C.3 [hw] // Récolté dans / nid de / Cryptomys [p, green label] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (Philont.) / macronyx sp. nov. / Hromádka, det. 2008 [p, red label]’. PA*©A*´YPൾ (unsexed specimen): ‘I.R.S.A.C.-MUS. CONGO / Kundelungu 1750 m. [p] / III [hw] -1950 / N. Leleup [p] / (Prairie marecag.) [hw] / M.C.3 [hw] // Récolté dans / nid de / Cryptomys [p, green label] // Voir 1adulte et / larves en alcool [hw] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (Philont.) / macronyx sp. nov. / Hromádka, det. 2008 [p, red label]’. Current status. Valid species. Philonthus mandrillus Hromádka, 2013 Philonthus mandrillus Hromádka, 2013f: 715, Figs 6–7. One paratype is deposited in NMPC (ex coll. L. Hromádka): PA*©A*´YPൾ (): ‘ TANZANIA 970 m / Njia Panda, Mwanihana / Udzungwa Mountains N.P / S07°47ʹ27.7ʺ;E036°49ʹ33.7ʺ / 12-14.iv.11 Dung Pitfall Trap / leg.Smith,R & Takano,H [p] // BMNH{E} / 2011-88 [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (s. str.) / mandrillus (s. str.) / Hromádka, det., 2012. [p, orange label]’. Current status. Valid species. Philonthus mehelya Hromádka, 2011 Philonthus mehelya Hromádka, 2011e: 187, Figs 38–40. Three paratypes are deposited in NMPC (ex coll. L. Hromádka): PA*©A*´YPൾඌ (2 1 ♀): ‘ Congo Belge / Libenge. 12.i.1948 / R.Cremer M.Neuman / ds excrém.humains [p] // R.I.Sc.Nat.Belg. / I. G. 16.665 [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (s.str.) / mehelya sp. nov. / Hromádka, det. 2010. [p, orange label]’. Current status. Valid species. Philonthus melaenornis Hromádka, 2011 Philonthus melaenornis Hromádka, 2011a: 200, Figs 29–32. One paratype is deposited in NMPC (ex coll. L. Hromádka): PA*©A*´YPൾ)(: ‘I.R.S.A.C.-MUS.R.A.C. / S. Rhodesia: Chipinga, [sic!] / 1200 à 1300 m. / VII.1960 N. Leleup // Humus dans résidu / forêt ombrophile [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (s. str.) / melaenornis sp. nov. / Hromádka, det., 2011. [p, orange label]’. Current status. Valid species. Philonthus merops Hromádka, 2011 Philonthus merops Hromádka, 2011g: 1346, Figs 1–4. Philonthus mnemon Smetana, 1995 Philonthus mnemon Smetana, 1995: 157, Figs 163–170. Seven paratypes are deposited in NMPC (ex coll. L. Two paratypes are deposited in NMPC (ex coll. L. Hro- Hromádka): mádka): PA*©A*´YPൾ)(: ‘ GHANA: Ashanti region / Kwadaso / 320 m,N 6 42 – PA*©A*´YPൾ (unsexed specimen): ‘AZ. Huachuca Mts. / Bear Saddle8100/ ’ W 1 39 / Dr. S. ENDRŐDY-YOUNGA [p] // Nr.331 / black light / 5.VIII.79 /A. Smetana [p] // ex coll. L. Hromádka / National Museum 31.III.1969 [p] // ex coll. L. Hromádka / National Museum / Prague, / Prague, Czech Republic [p] // PARATYPE / Philonthus / mnemon / Czech Republic [p] // PARATYPUS / PHILONTHUS (s. str.) / A. Smetana 1993 / CNC No.21950 [p, yellow label]’. merops sp. nov. / Hromádka, det. 2011. [p, red label] // PARATY- PA*©A*´YPൾ (unsexed specimen): ‘ARIZ.Graham Co.Pina- / leno Mts.Wet PUS / PHILONTHUS (s. str.) / hromadkai sp. nov. / Schülke, 2011. Cn. / 6100’29.VII.69 /A.Smetana [p] // ex coll. L. Hromádka / Natio- [p, red label]’. nal Museum / Prague, Czech Republic [p] // PARATYPE / Philonthus PA*©A*´YPൾ)(: ‘ GHANA: Ashanti region / Kumasi, Nhiasu / 330 m,N 6 / mnemon / A. Smetana 1993 / CNC No.21950 [p, yellow label]’. 43 – W 1 36 / Dr. S. ENDRŐDY-YOUNGA [p] // Nr.280 / at light / 9.X.1967 [p] // ex coll.L.Hromádka / National Museum / Prague, Czech Current status. Valid species, see Hൾ*©MAN (2001b). Republic [p] // PARATYPUS / PHILONTHUS (s. str.) / merops sp. nov. / Hromádka, det. 2011. [p, red label] // PARATYPUS / PHILONTHUS Philonthus monaeses Smetana, 1995 (s. str.) / hromadkai sp. nov. / Schülke, 2011 [p, red label]’. Philonthus monaeses Smetana, 1995: 402, Figs 640–645. PA*©A*´YPൾ (unsexed specimen): ‘ GHANA: Northern region / Banda- Nkwanta / 150 m,N 8 22 – W 2 08 / Dr. S. ENDRŐDY-YOUNGA Two paratypes are deposited in NMPC (ex coll. L. Hro- [p] // Nr.47 / light trap / 26-31.VII.1965 [p] // ex coll. L. Hromádka / mádka): National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (s. str.) / merops sp. nov. / Hromádka, det. 2011. [p, PA*©A*´YPൾඌ (2 unsexed specimens):‘La. Concordia / Pa. 5 mi Wr-Fe/ riday red label] // PARATYPUS / PHILONTHUS (s. str.) / hromadkai sp. 1.V.76 / A. Smetana [p] // ex coll. L. Hromádka / National Museum / nov. / Schülke, 2011. [p, red label]’. Prague, Czech Republic [p] // PARATYPE / Philonthus / monaeses / PA*©A*´YPൾ)(: ‘ GHANA: Ashanti region / Kwadaso / 320 m,N 6 42 – A. Smetana 1993 / CNC No.21970 [p, yellow label]’. W 1 39 / Dr. S. ENDRŐDY-YOUNGA [p] // Nr.327 / mixed light / Current status. Valid species, see Hൾ*©MAN (2001b). 18.III.1969 [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (s. str.) / merops sp. nov. / Hromádka, det. 2011. [p, red label] // PARATY- Philonthus mormyrops Hromádka, 2013 PUS / PHILONTHUS (s. str.) / hromadkai sp. nov. / Schülke, 2011. Philonthus mormyrops Hromádka, 2013e: 224, Figs 58–61. [p, red label]’. PA*©A*´YPൾ)(: ‘ GHANA: Ashanti region / Kwadaso, 259 m / N 6º 42ʹ – W 1º The holotype and three paratypes are deposited in NMPC 39ʹ / Dr.S. ENDRŐDY-YOUNGA [p] // Nr.398 / on light / 15.IX.1969. (ex coll. L. Hromádka): [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Re- HƟĿƟ*´YPൾ (): ‘ MALAWI S / Mulanoe Mts. env. / 22. xii. 2001 / J. public [p] // PARATYPUS / PHILONTHUS (s. str.) / merops sp. nov. Bezděk, lgt. [p, yellow label] // ex coll.L. Hromádka / National Muse- / Hromádka, det. 2011. [p, red label] // PARATYPUS / PHILONTHUS um / Prague, Czech Republic [p] // HOLOTYPUS / PHILONTHUS (s. str.) / hromadkai sp. nov. / Schülke, 2011. [p, red label]’. (s. str.) / mormyrops spec. nov. / Hromádka, det. 2008 [p, red label]’. PA*©A*´YPൾ (unsexed specimen): ‘WEST AFRICA,Ghana / Northern PA*©A*´YPൾ ♀ (): ‘ MALAWI S / Mulanoe Mts.env./ 22.xii. 2001 / J.Bezděk, Region / Tamale / leg.Dr.S.Endrödi [p] // No. 51 / Lichtfalle/Quarz/ lgt. [p, yellow label] // ex coll. L. Hromádka / National Museum / / 27.VIII.1970. [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (s. Prague, Czech Republic [p] // PARATYPUS / PHILONTHUS (s. str.) / mormyrops spec. nov. / Hromádka, det. 2008 [p, red label]’. str.) / merops sp. nov. / Hromádka, det. 2011. [p, red label] // PARA- PA*©A*´YPൾ (): ‘ [p, pink label] // MALAWI S / Mulanoe Mts. env. / 22. TYPUS / PHILONTHUS (s. str.) / hromadkai sp. nov. / Schülke, xii. 2001 / J. Bezděk, lgt. [p, yellow label] // ex coll. L. Hromádka 2011. [p, red label]’. / National Museum / Prague, Czech Republic [p] // PARATYPUS PA*©A*´YPൾ (): ‘ SIERRA LEONE / Western Area / Base Picket Hill / / PHILONTHUS (s. str.) / mormyrops spec. nov. / Hromádka, det. 9.i.1997 W.Rossi [p, yellow label] // ex coll. L. Hromádka / National 2008 [p, pink label]’. Museum / Prague, Czech Republic [p] // PARATYPUS / PHILON- PA*©A*´YPൾ)(: ‘ MALAWI S Jall env. / 30 km SE of Zamba / 26.-27. THUS (s. str.) / merops sp. nov. / Hromádka, det. 2011. [p, red label] xii.2001 / J. Bezděk lgt. [p, violet label] // ex coll. L. Hromádka / // PARATYPUS / PHILONTHUS (s. str.) / hromadkai sp. nov. / National Museum / Prague, Czech Republic [p] // PARATYPUS / Schülke, 2011. [p, red label]’. PHILONTHUS (s. str.) / mormyrops sp. nov. / Hromádka, det., 2008 Current status. Philonthus hromadkai Schülke, 2012. [p, red label]’. Comments. S*ö*üŪĿĸൾ (2012) proposed the new substitute Current status. Valid species. name Philonthus hromadkai Schülke, 2012 for Philonthus merops Hromádka, 2011, a junior primary homonym of Philonthus nectarinia Hromádka, 2012 Philonthus (Onychophilonthus) merops Smetana, 1963. Philonthus nectarinia Hromádka, 2012e: 183, Figs 15–21.

Philonthus lanius Hromádka, 2013 Philonthus lanius Hromádka, 2013c: 196, Figs 33–37. The holotype and two paratypes are deposited in NMPC (ex coll. L. Hromádka): HƟĿƟ*´YPൾ (): ‘ Kamerun / Joh.-Albrechtshöhe / 14.IX.-6.X.98 / l.Conradt S. [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // HOLOTYPUS / PHILONTHUS (s. str.) / lanius sp.nov. / Hromádka, det., 2013. [p, red label]’. PA*©A*´YPൾඌ (2): ‘ Kamerun [hw] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // PARATYPUS / PHILON- THUS (s. str.) / lanius sp.nov. / Hromádka, det., 2013. [p, red label]’. Current status. Valid species.

Philonthus havai Hromádka, 2013 Philonthus havai Hromádka, 2013d: 396, Figs 45–46. The holotype is deposited in NMPC (general collection): HƟĿƟ*´YPൾ (): ‘ [p, red label] // ETHIOPIA – Bale / Sabsebe Washa N Park / 07 °03ʹN 39 ° 39É [sic!] / 3.600 m 1971 [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // HO- LOTYPUS / PHILONTHUS (s. str.) / havai sp. nov. / Hromádka, det., 2010. [p, orange label]’. Current status. Valid species.

Philonthus ptilopsis Hromádka, 2014 Philonthus ptilopsis Hromádka, 2014j: 424, Figs 39–42. The holotype is deposited in NMPC (general collection): HƟĿƟ*´YPൾ (): ‘ TANZANIA / Mwanza / 11.x. 1969 / Ardö leg. [p] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // HOLOTYPUS / PHILONTHUS (s. str.) / ptilopsis sp. nov. / Hromádka, det., 2013. [p, red label]’. Current status. Valid species.

Philonthus pantodon Hromádka, 2010 Philonthus pantodon Hromádka, 2010d: 108, Figs 27–30. The holotype is deposited in NMPC (general collection): HƟĿƟ*´YPൾ (): ‘ SUDAN mer. / Shambe / 15. 10. 1966 / Dr. P. Štys leg. [p, green label] // ex coll. L. Hromádka / National Museum / Prague, Czech Republic [p] // HOLOTYPUS / Philonthus (s. str.) / pantodon sp. nov. / Hromádka, det. 2009. [p, red label]’. Current status. Valid species.