Review of the genus Ressia Sinev, 1988 (Lepidoptera: Cosmopterigidae), with descriptions of four new species from China Author Zhang, Di College of Life Sciences, Nankai University, Tianjin 300071, China Author Li, Houhun College of Life Sciences, Nankai University, Tianjin 300071, China & College of Life and Geographic Sciences, Kashi University, Kashi 844000, China; Xinjiang Key Laboratory of Biological Resources and Ecology of Pamirs Plateau, Kashi 844000, China text Zootaxa 2023 2023-10-30 5360 4 583 592 https://www.mapress.com/zt/article/download/zootaxa.5360.4.7/52135 journal article 10.11646/zootaxa.5360.4.7 1175-5326 10152774 E967718F-F071-49BC-B69D-D4D0E8979530 Ressia forcipata Li , sp. nov. ( Figs 5 , 11 ) urn:lsid:zoobank.org:act: 65792874-FDA7-45DC-9406-C90F1767BA5C Type material. Holotype ♁. CHINA , Guangxi : Hongtan , Huaping , Lingui County ( 25.61°N , 109.97°E ), 842 m , 4.VIII.2022 , leg. H Sun et al. , slide No. ZD 21568. Paratype : 1♁, Dongma , Mt. Jiuwan , Rongshui County ( 25.17°N , 108.81°E ), 866 m , 28.VII.2022 , leg. H Sun et al. , slide No. ZD 21569 . Diagnosis. The new species is diagnosed by the forewing markings with pale bluish metallic luster, and by the left pleural lobe of the male eighth segment with a triangular dorsoapical process and an elongate ventroapical process. The new species is similar to R. sinevi sp. nov. , and the differences between them are stated in the diagnosis of the latter species. Description. Adult ( Fig. 5 ). Wingspan 10.0– 10.5 mm . Head . Vertex dark brown, frons grayish yellow. Antenna with scape dark brown except yellow at apex dorsally, grayish yellow ventrally; flagellum dark brown alternated with grayish yellow dorsally, grayish yellow ventrally. Labial palpus dark brown, except third palpomere yellow basally. Thorax . Dorsum of mesothorax and tegula dark brown. Forewing dark brown; markings silvery white, with pale bluish-metallic luster: subbasal fascia from basal 1/4 of costal margin to dorsum, narrow anteriorly, wide posteriorly; short stripe at 1/2 and subtriangular spot at 3/4 of costal margin respectively, wedge-shaped spot at end of fold, ill-defined spot at tornus; fringe dark brown. Hindwing and fringe dark brown. Fore- and midlegs dark brown, except coxae and femora yellowish white dorsally, tibiae yellowish white at 1/2 and apex, first tarsomere ringed with yellowish white at base and apex, 4–5 tarsomeres yellowish white; hindleg with femur and tibia dark brown except tibia yellowish white at 1/2 and apex on outer surface, yellowish white on inner surface, first tarsomere dark brown, other tarsomeres yellowish white. Male abdomen and genitalia ( Fig. 11 ): Abdomen. Furcate process of eighth tergum forcipate, narrowed towards pointed apex, curved inward, sclerotized on inner margin. Pleural lobes of eighth segment subrectangular, asymmetrical: left lobe broadly concave medioapically, forming two distinct processes: dorsoapical process triangular, ventroapical process longer, dilated distally; right lobe with dorsal and ventral margins convolved distally, apex obliquely outward, slightly concave. Male genitalia . Socus with left brachium spatulate, about 1/3 length of right brachium; right brachium with basal 1/3 wide, distal 2/3 slender, curved at distal 1/5, pointed at apex. Valva with stalk uniformly slender; cucullus dilated subovately, with dense setae ventrally. Left valvella slender, weakly sinuate, distally broadened ovately, with dense setae. Phallus slightly narrower distally, bent near apex, blunt at apex. Female. Unknown. Distribution. China ( Guangxi ). Etymology. The specific epithet is derived from the Latin forcipatus , referring to the shape of the furcate process of the eighth tergum.