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A taxonomic revision of the Iranian species of the family Cossidae is conducted. Sixthy-nine species and 16 subspecies in 26 genera and five subfamilies, namely Catoptinae, Mehariinae, Stygiinae, Cossinae and Zeuzerinae, are identified. Meharia baluchestana Alipanah & Yakovlev, sp. n. and Cossulus kopetdaghensis Yakovlev & Alipanah, sp. n. are described. Dyspessa elbursensis derbenti Daniel, 1964 is raised to the species level, Dyspessa derbenti Daniel, 1964, stat. n.; Dieida ledereri (Staudinger, 1817) is considered as the senior synonym of D. persa Strand in Stichel, 1911, syn. n.; Cossus coccus araraticus Teich, 1896 is considered as a senior synonym of C. c. armeniaca Rothschild, 1912, syn. n.; C c. kossai Wiltshire, 1957 as a senior synonym of C. c. omrana Wiltshire, 1957, syn. n.; and Deserticossus arenicola iranica (Austaut, 1897), syn. n. and D. arenicola transcaucasicus (Zukowsky, 1936), syn. n. are newly synonymized with D. arenicola arenicola (Staudinger, 1879). Additionally, the genus Mormogystia Schoorl, 1990, and 15 species, namely Dyspessa alpherakyi (Christoph in Romanoff, 1885), D. artemis Yakovlev, 2008, D. blonda Yakovlev, 2008, D. stroehlei Yakovlev, 2008, D. tsvetaevi Yakovlev, 2008, Barchaniella inspersa (Christoph, 1887), B. sacara (Grum-Grshimailo, 1902), Cossulus intractatus (Staudinger, 1887), C. mollis (Christoph, 1887), C. stertzi (Püngeler, 1899), Deserticossus campicola (Eversmann, 1854), Kotchevnik durelli Yakovlev, 2004, Mormogystia reibellii (Oberthür, 1876), Eremocossus erebuni Yakovlev, 2008 and Phragmataecia turkmenbashi Yakovlev, 2008 are newly reported for the fauna of Iran. Moreover, the hitherto unknown female of Kotchevnik durelli is described. Additional data of the species previously reported from Iran is provided and the collecting data maps of the entire studied species are presented.

Elegia species deposited in the Hayk Mirzayans Insect Museum (HMIM) were examined and three species were identified. Elegia kharazii sp. nov. is described based on a single male and two females collected in Gilan and Golestan Provinces, Iran and compared with the externally similar European species E. similella (Zincken, 1818). Elegia saecula Kemal, Kýzýldað & Koçak, 2020 (syn. nov.) is considered as a junior synonym of Elegia iozona (Meyrick, 1937). Elegia atrifasciella Ragonot, 1887, collected in the north-west Iran (East Azarbaijan Province), is a new species for the fauna of Iran.

Sitochroa urmiensissp. nov. is described based on a single male collected in West Azarbaijan Province, Iran. Sitochroa palealis (Denis & Schiffermüller, 1775) is considered as a senior synonym of Loxostege farsalis Amsel, 1950 syn. nov.Loxostege malekalis Amsel, 1950 is transferred to the genus Sitochroa Hübner, as S. malekalis (Amsel, 1950) comb. nov. And the hitherto unknown female of S. malekalis is described and illustrated.

The 22 species of the tortricid tribe Cnephasiini recorded from Iran are reviewed. Cnephasia razowskii, sp. n., is described and illustrated. Five species, i.e., C. communana (Herrich & Schäffer, 1851), C. genitalana Pierce & Metcalfe, 1922, C. tianshanica Filipjev, 1934, C. kenneli Obraztsov, 1956 and Eana incanana (Stephens, 1852), are newly reported for the fauna of Iran. New distributional data are presented for all other species. The previously unknown females of C. facetana Kennel, 1901 and C. kenneli are described and illustrated. A re-description of the female genitalia of C. grandis Osthelder, 1938 is provided owing to its poor original description.

The Iranian species of the genus Evergestis were reviewed taxonomically and as a result, Evergestis pazukii sp. n. is described as a new species, E. comealis Amsel stat. n. is raised to species level from the subspecies E. caesialis comealis, and four species, namely E. flavifuscalis Rebel, E. limbata (Linnaeus), E. pechi (Bethune-Baker), and E. serratalis Staudinger are newly reported from Iran. Furthermore, the females of Evergestis africalis (Guenée), and E. nomadalis (Lederer), and the male of E. elbursalis Amsel are described and illustrated for the first time. A redescription of the male of E. hyrcanalis Amsel is provided mainly based on the genital structure, and the male and female genitalia of E. boursini Amsel and E. flavifuscalis Rebel are redescribed, respectively due to their poor descriptions. Additional remarks on the previousely reported species and new data on their distribution in Iran are also provided.

A complete description of Acteniopsis gambronensis sp. n. is given based on three males and three females collected in the south of Iran, Hormozgan Province. The female of A. kurdistanella Amsel, 1959 is redescribed and illustrated and new distributional data for this species is also provided. Acteniopsis robustus Asselberges, 2010 is transferred to the genus Stemmatophora Guenée, 1854, S. robustus (Asselbergs, 2010), comb. n. A taxonomic review of the genus Acteniopsis is presented. Introduction The genus Acteniopsis Amsel, 1959 was erected to accommodate the type species A. kurdistanella Amsel, 1959. Acteniopsis belongs to the subfamily Pyralinae along with more than 1100 species in 134 genera. This subfamily is more diverse in Asia and Africa than in the western hemisphere (Munroe and Solis 1999; Nuss et al. 2003–2017). There is no obvious synapomorphic character for this subfamily (Solis and Shaffer 1999). Prior to the current study, Acteniopsis included only two species, A. kurdistanella and A. robustus Asselbergs, 2010 which had been described from Iraq and United Arab Emirates, respectively. The former species is also reported from Iran by Amsel (1961). According to Amsel (1959), this genus is generally close to Actenia Guenée, 1854 (presently known as Stemmatophora Guenée, 1854), although has very small and hardly recognizable maxillary palpi, and different, much shorter, and more broadly scaled labial palpi. The wing venation of these two genera is more or less similar accordingly; however in the hindwing of Acteniopsis the veins M2 and M3 originate from the same point, while in Stemmatophora they are on a short stalk. Also, in the forewing of Stemmatophora vein R5 is more or less on a long stalk at R3+R4, while in Acteniopsis R3+R4+R5 arising from a common point, and sometimes in female, R3+R4 has a short stalk with R5. Their antennae are differently ciliated ventrally: Stemmatophora has two rows of stout brushes of ciliae ending in numerous split hairs, while in Acteniopsis the ciliae are very tender, distally split in few fine hairs (Amsel 1959). During the study of Pyralinae of Iran, an unknown Acteniopsis species was found in the Lepidoptera collection of the Hayk Mirzayans Insect Museum (HMIM), Iranian Research Institute of Plant Protection (IRIPP). The aim of the present study is to describe this new Acteniopsis species which has been collected in Hormozgan Province in 1986. We also redescribe the female of A. kurdistanella based on the Iranian specimens collected in Chaharmahal va Bakhtiari, Fars, Hamedan and Kermanshah Provinces. Furthermore, the genus Acteniopsis is here revised.

Syrianarpia elburzalis sp. n. (Crambidae: Scopariinae) is described as a new species from Iran. A taxonomic review of the genus and an identification key to the known species are provided. New data on morphology, genitalia, distribution, and habitat of the studied Iranian species are provided.