Stathmopoda rhombica Wang & Wang & Guan 2021, sp. nov

Stathmopoda rhombica sp. nov. (Figs 9, 22, 35) urn:lsid:zoobank.org:act: 0B81BFE4-F23A-4453-8ACB-5ED1D3B18AD7 Type material. CHINA, Sichuan: Holotype ♂, Labahe, Tianquan County, 1300 m, 29.VII.2004, leg. YD Ren, slide No. GW 15175. Paratypes. 1♀, same data as holotype; 1♀, Baoxing County, 1100 m, 5.VIII.2004, leg. YD Ren, slide No. GW 13009. Diagnosis. The new species is similar to S. orbiculata Meyrick, 1913 in the forewing having three spots on the ventral margin. It can be distinguished in the male genitalia by the costa roundly convex, the sacculus approximately 2/3 the length of the valva, and the rhombic juxta; in the female genitalia by the ductus bursae without a sclerotized sub-rectangular plate anteriorly and the corpus bursae with one signum. In S. orbiculata, the costa is trapezoidally convex, the sacculus is approximately half the length of the valva, and the juxta is semi-elliptical; the ductus bursae has a sclerotized sub-rectangular plate anteriorly and the corpus bursae has two signa. The new species is also similar to S. bucera sp. nov., and the differences between them are stated in the diagnosis of the latter species. Description. Adult (Fig. 9). Wingspan 10.0– 10.5 mm. Head with frons and vertex ochreous yellow; occiput blackish brown. Labial palpus with second segment cream white on inner surface, yellowish brown on outer surface; third segment brown. Antenna dark brown. Thorax and tegula dark brown. Forewing dark brown; ventral margin with three ochreous yellow spots: first spot at basal 1/4, sub-rectangular, anteriorly narrowed, not reaching costal margin; second spot at basal 3/5, sub-quadrate, approximately 2/3 width of wing; third spot at distal 1/5, sub-triangular, smallest, approximately half width of wing; fringe dark brown. Hindwing and fringe brown. Legs yellowish white; foreleg dark brown on outer side; mid tibia dark brown at middle and apex, tarsus dark brown at apex; hind tibia annulated with blackish brown, bearing yellowish brown bristles at middle and apex, first tarsomere of hind tarsus blackish brown, with long yellowish brown bristles at apex, fifth tarsomere blackish brown. Abdomen dark brown on dorsal surface, silvery white on ventral surface. Male genitalia (Fig. 22). Uncus wide at base, with long setae laterally, slightly narrowed to distal 1/4, distal 1/4 abruptly narrowed, beak-shaped in lateral view. Gnathos triangular, gradually narrowed from base to apex, slightly reflexed in a hook apically. Tegumen with height approximately twice length of uncus, bifurcate in anterior half. Valva wide basally, narrowed toward cucullus; cucullus sub-elliptical, nearly straight on dorsal margin, obtuse on ventral margin, subparallel to preapex, apex rounded, extending obliquely upward; inner process curved inward beyond middle by a right angle; costa roundly convex; sacculus banded, approximately 2/3 length of valva, slightly concave near base on ventral margin, apex rounded, slightly free from cucullus, exceeding ventral corner of cucullus. Vinculum narrowly banded; saccus V-shaped, approximately 1/3 length of uncus. Juxta sub-rhombic; anellar lobes sub-quadrangular (left in aedeagus). Aedeagus 1.3 times length of valva, tapered from base to apex, with a weakly sclerotized plate near base; distal process clubbed, 1/4 length of aedeagus, narrowly rounded at apex; cornutus consisting of three short spines, placed at basal 1/3. Female genitalia (Fig. 35). Intersegmental membrane between papillae anales and eighth abdominal segment approximately twice length of papillae anales. Apophyses posteriores approximately 1.6 times length of apophyses anteriores. Eighth segment straight on posterior margin, with long setae; eighth stenite produced anteriorly. Antrum sub-rectangular, slightly narrowed anteriorly. Ductus bursae approximately 1/3 length of corpus bursae, narrowed to middle, then gradually widened to corpus bursae. Corpus bursae elliptical, with numerous large denticles in transition between corpus bursae and ductus bursae; signum C-shaped, open posteriorly, located near entrance of corpus bursae. Ductus seminalis originating from posterior 1/3 of corpus bursae, curved upward from near base. Distribution. China (Sichuan). Etymology. This specific epithet is derived from the Latin rhombicus, referring to the shape of the juxta in the male genitalia.