Taxonomy of the mediseorsa species group of the genus Nemophora Hoffmannsegg 1798 (Lepidoptera: Adelidae) Author Sun, Hao College of Life Sciences, Nankai University, Tianjin 300071, China Author Li, Houhun College of Life Sciences, Nankai University, Tianjin 300071, China & Key Laboratory of Biological Resources and Ecology of Pamirs Plateau in Xinjiang, Kashi 844000, China; College of Life and Geographic Sciences, Kashi University, Kashi 844000, China text Zootaxa 2023 2023-03-30 5258 4 485 494 http://dx.doi.org/10.11646/zootaxa.5258.4.9 journal article 241835 10.11646/zootaxa.5258.4.9 bb91ac8e-54bd-462d-a03f-7802f779a722 1175-5326 7784653 ACF94546-2069-4AFB-B5CB-9417D9BB891C Nemophora mediangusa sp. nov. ( Figs 1 , 7 ) urn:lsid:zoobank.org:act: 87289B47-50E7-4595-9715-584050EFB90 Type material. CHINA , Tibet : Holotype ♁, Pailong Village , Linzhi County , 2031 m , 21.VI.2019 , leg. MJ Qi , JQ Deng, slide No. SH 19105 . Paratypes : 13 ♁, 20−22.VI.2019 , other same data as holotype, slide Nos. SH 19095, SH20301, SH20347; 1 ♁, Tongmai Town , Bomi County , 1997 m , 24.VI.2019 , leg. MJ Qi & JQ Deng , slide No. SH 20302 . Diagnosis. The new species can be distinguished from its congeners by the forewing without a black speckle basally, the outer fascia distinctly narrowed and not separated medially, and in the male genitalia by the phallus with hook-shaped process at distal 1/8. Description. Adult ( Fig. 1 ). Male wingspan 16.0−18.0 mm. Head: Vertex brownish yellow; frons purplish gray. Eye interocular index 0.70−0.81. Proboscis dark brown. Labial palpus 0.57‒0.59 × vertical eye diameter; yellow except apex of third palpomere black. Antenna 3.8‒4.0 × length of forewing; scape yellow ventrally, purplish blue dorsally; flagellum grayish brown except basal 1/6 dark brown. Thorax: Mesonotum golden yellow; tegula bronzy. Forewing ground color orange yellow, purplish bronzy from beyond outer fascia along costal margin to apex and through termen to tornus; two silvery gray bands with purple luster, edged with black streaks: first band to basal 1/3 along costal margin, second band to basal 1/3 along posterior margin of cell; five black streaks radiating from base of wing: first streak to basal 1/4 along R 1 , second streak to basal 1/4 along anterior margin of cell, third streak to basal 1/3 along CuP, fourth streak to basal 1/3 along 1A+2A, fifth streak to basal 1/5 along dorsum and then curved obliquely to basal 1/4 of wing approaching to 1A+2A; inner and outer fasciae silvery gray, with purplish blue luster, edged with dark yellowish brown: inner fascia uniform in width, slightly curved outward medially, outer fascia curved inward and distinctly narrowed medially, beyond middle of outer fascia placed a round dark yellowish brown spot; medial fascia yellow, widened anteriorly; eight longitudinal black streaks radiating from outer fascia to apex; fringe brown. Hindwing and fringe grayish brown. Foreleg yellow ventrally, purplish blue dorsally; midleg yellow ventrally, purplish bronzy dorsally except femur yellow; hindleg with femur pale yellow, tibia yellow except bronzy in distal 1/5, tarsus yellow. Epiphysis dark brown, at distal 1/3 of tibia, reaching near apex of tibia. Abdomen: Dark brown. Male genitalia ( Fig. 7 ). Socius elongate ovoid, length 2.3 × width. Uncus triangular, slightly concave anteromedially, width of anterior margin 1.6 times length. Tegumen without median ridge. Valva separated from near base, subtriangular, narrowly rounded at apex, slightly concave medially on costal margin, with arced ridge basally on ventral surface, extending to basal 1/5 of valva; sacculus reaching distal 1/3 of valva, roundly convex medially, with two longitudinal ridges basally on ventral surface. Transtilla with a semicircular emargination anteromedially, straight on posterior margin; median process spiniform, reaching posterior 2/5 of tegumen apically. Vinculum 2.2 × length of valva, broadly rounded on anterior margin. Phallus same length as vinculum, with spines from distal 1/7 to 1/8, with hook-shaped process at distal 1/8 ( Fig. 7a ). Juxta 0.65 × length of phallus; lateral arm 0.38 × length of arrow head. Female unknown. Distribution. China ( Tibet ). Etymology. The specific epithet is derived from the Latin mediangusa , referring to the medially narrowed outer fascia of the forewing.