Review of the genus Saridoscelis Meyrick, 1894 (Lepidoptera: Yponomeutidae) in China, with descriptions of four new species Author Liu, Haoyu 0009-0001-9556-1526 College of Life Sciences, Nankai University, Tianjin 300071, China & https: // orcid. org / 0009 - 0001 - 9556 - 1526 Author Wang, Shuxia 0000-0002-9316-6661 College of Life Sciences, Nankai University, Tianjin 300071, China & shxwang @ nankai. edu. cn; https: // orcid. org / 0000 - 0002 - 9316 - 6661 shxwang@nankai.edu.cn text Zootaxa 2023 2023-11-21 5375 1 128 136 https://www.mapress.com/zt/article/download/zootaxa.5375.1.8/52318 journal article 10.11646/zootaxa.5375.1.8 1175-5326 10170280 37D41B77-30F2-40E6-A8BB-212D56BBC83F Saridoscelis exstria Wang , sp. nov. urn:lsid:zoobank.org:act: 7146C4AB-C749-4F5A-B335-26A8F9F0C500 ( Figs 3 , 9 , 12 ) Type material. CHINA , Xizang : Holotype ♁, Pailong Town ( 30.01°N , 95.00°E ), Linzhi County , 2031 m , 20.VI.2019 , leg. MJ Qi & JQ Deng , slide No. LHY21053. Paratype : Xizang : 1♀ , Tongmai Town ( 30.10°N , 95.08°E ), Bomi County , 2029 m , 26.VI.2019 , leg. MJ Qi & JQ Deng , slide No. LHY21051 . Diagnosis. The new species can be distinguished from its congeners by the white forewing with scattered dark brown scales, in the male genitalia by the stout socius with three plates of fringed sensillae, and the valva with costa triangularly produced at distal 1/3 and with ventral margin nearly straight. Description. Adult ( Fig. 3 ). Wingspan 20.0 mm. Head white. Antenna white. Labial palpus white; first and second palpomeres dark brown on outer surface. Thorax white; tegula white, tinged with pale grey at apex. Forewing white, with scattered dark brown scales; costal margin with basal 1/3 dark brown; fringe white mottled with yellowish brown, with a greyish brown subterminal line along termen. Hindwing white, tinged with pale yellow; fringe white, mottled with brown along costal margin, with a pale grey median line along termen. Legs white; foreleg dark brown ventrally, tibia and tarsus with white dense long scales dorsally, tarsus mottled with brown; tarsus of midleg brown; spurs and tarsus of hindleg mottled with brown. Abdomen ( Fig. 9a ). Eighth abdominal sternite of male with posterior half narrowed anteriorly, anterior half parallel-sided; posterior margin semicircularly concave, sclerotized; with a triangular lateral projection at each side anteriorly. Male genitalia ( Fig. 9 ). Uncus slender, slightly narrowed to pointed apex. Socius stout, widened medially, with three plates of fringed sensillae distally. Valva with costa triangularly produced at distal 1/3, ventral margin nearly straight, apex rounded; dorsoproximal process narrow, extending obliquely upward; sacculus indistinct. Saccus slender, nearly as long as valva, bulbed in distal 1/5. Aedeagus bent near base, narrow from 1/5 to 1/2; distal half slightly wider, spinous. Female genitalia ( Fig. 12 ). Papillae anales broad, with long setae.Apophyses anteriores 3/5 length of apophyses posteriores. Lamella postvaginalis large, hairy, widened medially, straight on posterior margin. Antrum parallel-sided, sclerotized. Ductus bursae membranous, widened toward corpus bursae. Corpus bursae large, ovate; signum absent. Distribution. China ( Xizang ). Etymology. The specific epithet is derived from the Latin exstrius , referring to the forewing without the oblique lines as in the other species of the genus.