Taxonomy of the genus Periacma Meyrick (Lepidoptera: Autostichidae) from China, with a checklist of the world species Author Wang, Shuxia College of Life Sciences, Nankai University, Tianjin 300071, China. Author Xu, Zhixin 0000-0001-6851-8234 College of Life Sciences, Nankai University, Tianjin 300071, China. text Zootaxa 2024 2024-01-11 5399 2 101 129 http://dx.doi.org/10.11646/zootaxa.5399.2.1 journal article 10.11646/zootaxa.5399.2.1 1175-5326 10493947 EC9BEA58-70C4-4BA2-B7FA-094F49A911A1 Periacma nepalensis , Ueda et Moriuti, 1996 ( Figs 14 , 29 , 42 ) Periacma nepalensis , Ueda et Moriuti, 1996: 20 . TL: Nepal . TD: OPU. Material examined. CHINA , Xizang : 3♂4♀ , Zhangmu Town , Nielamu County , 1961 m , 8.VII.2019 , leg. MJ Qi & JQ Deng , slide Nos. XZX20769 ♂, XZX20861 ♂, XZX20770 ♀ . Diagnosis. Periacma nepalensis is similiar to P. himalayensis , Moriuti et Ueda, 1996 in male genitalia. It can be distinguished by the sacculus with two spines at apex, and the aedeagus with two processes distally. In P. himalayensis , the sacculus is truncate at apex, and the aedeagus has three lobes near the apex. Description. Adult ( Fig. 14 ). Wingspan 14.5 – 16.0 mm. Head . Vertex and frons yellow. Labial palpus yellow, in male second segment ringed with black near apex of outer surface; in female second segment with black scales on ventral surface, ringed with black terminally. Antenna yellow on ventral surface; dark brown except flagellum ringed with yellow on dorsal surface. Thorax. Mesonotum orange yellow, with dense black scales in central part; tegula yellow, mixed black scales. Forewing orange yellow, with dark brown scales; markings dark brown: spot at base of costal margin and dorsum respectively; speckle from near base extending along above fold to distal 1/3 of fold; discal spot striped, above preceding speckle; postmedial fascia from beyond middle of costal margin to tornus; apical fascia narrowed along termen, not meeting postmedial fascia at tornus; terminal dots ranging from apex and along termen; fringe concolorous with wing. Hindwing and fringe grey. Legs yellow, except tarsomeres 3 4 greyish brown; on dorsal surface, foreleg with grey black scales on femur and tibia, midleg with black scales on tibia, tarsus with black scales; on outer surface, hindleg black at base of tibia, with a few grey scales on tarsus. Male genitalia ( Fig. 29 ). Uncus narrowed at basal 1/4 and distal 1/4, setose laterally from basal 1/4 to distal 1/4; distal 1/4 horizontally extended and narrowed outward to each end, obtuse at apex. Gnathos with basal arm short; ventral plate short and broad, sub-rectangular, smooth. Valva with costal part subparallel from base to before middle, setose and dilated ovately distally; costa concave medially; dorso-proximal proess club-shaped; sacculus slightly longer than 2/3 length of costal part of valva, narrowed from base to 3/5, distal 2/5 produced to a unformly slender process curved ventrad before apex, with two short apical spines. Saccus sub-triangular, apex obtusely rounded. Aedeagus stout, slightly longer than 3/5 length of costal part of valva, distally produced to a flattened plate that is finely serrate on ventral margin, deeply incised before apex ventrally, forming a short process before concavity; apically bilobed process arising from distal 1/4, not reaching apex of aedeagus; cornutus at basal 1/3, bifurcated distally. Female genitalia ( Fig. 42 ). Papilla anale sub-rounded, setose.Apophysis anterioris about 1/2 length of apophysis posterioris. Eighth sternal plate with two mound-shaped setose processes posteriorly. Lamella antevaginalis broadly banded, triangularly produced posterolaterally. Ductus bursae membranous, with small granules evenly scattered. Corpus bursae ovate, uniformly scattered with small granules; signum absent. Distribution. China ( Xizang ), Nepal . Note. This species is newly recorded for the Chinese fauna, and the female is here described for the first time.