Thiotricha albida, Lee & Li, 2024

Thiotricha albida sp. nov.

( Figs 7A View FIGURE 7 , 23H View FIGURE 23 , 30B View FIGURE 30 , 48A View FIGURE 48 )

Type material. Holotype ♂, CHINA, Guangxi Zhuang Autonomous Region, Mt. Daming , 1250 m, 24.v.2011, leg. Linlin Yang and Yinghui Mou, genitalia slide no. LGE18104 . Paratypes. CHINA: Sichuan Province: 1 ♂, Caoping Village ( 30.95°N, 103.32°E), 1557 m, Sanjiang Town , Wenchuan County, 9.vii.2014, leg. Kaijian Teng, Wei Guan, Weichun Li and Shurong Liu GoogleMaps ; Yunnan Province: 1 ♀, Mt. Weibao ( 25.18°N, 100.34°E), 2200 m, Weishan County, 20.vii.2001, leg. Houhun Li and Xinpu Wang GoogleMaps , genitalia slide no. ZJL05247; 2 ♂♂, Mt. Weibao ( 24.52°N, 98.84°E), 2244 m, Weishan County, Dali City , 22, 23.vii.2013, leg. Shurong Liu, Yuqi Wang and Kaijian Teng GoogleMaps , genitalia slide no. LGE18094; 1 ♂, 1 ♀, Mt. Weibao ( 25.18°N, 100.34°E), 2205 m, Weishan County, Dali City , 2, 3.viii.2014, leg. Kaijian Teng, Wei Guan, Xiuchun Wang and Shurong Liu GoogleMaps , genitalia slide nos. LGE18095f, LGE 18112m.

Diagnosis. This species can be diagnosed by the simply marked shining white forewing, the slender valva with distal 1/2 outwardly curved, a sharply pointed apex of the aedeagus, the short ductus bursae and the enlarged corpus bursae.

Description. Adult ( Fig. 7A View FIGURE 7 ). Wingspan 10.5−12.0 mm. Head white. Labial palpus creamy white, ventral surface suffused with fuscous, segment III as long as II, pointed at apex. Antenna with scape white; flagellum brown except basal 1/3 of dorsal surface white, male cilia as long diameter. Thorax and tegula white. Forewing shining white, anterior edge of costa fuscous in basal 1/2 or 1/4; from distal 1/4 of costa a slender, outwardly oblique dark brown streak; beyond and parallel to this, a slender black streak followed by a dark brown triangle; apical spot elongated, bordered inwardly and outwardly by white scales; a black longitudinal median line in distal 1/3 of wing, slightly curved toward dorsum proximally, sometimes interrupted at 1/3 or at middle; dorsum sometimes shaded with fuscous; fringe of apical area white with subterminal and terminal fuscous bands; remaining fringe white, mixed with grey in basal half of dorsum. Hindwing dark grey, black at apex; fringe grey. Legs whitish ochre, slightly suffused with fuscous; fore leg fuscous on outer surface, mid and hind tibiae fuscous, each tarsomere white at apex.

Male sternum VIII ( Fig. 23H View FIGURE 23 ). 1/5 length of abdomen, gradually narrowed to posterior 2/5, bifurcate from posterior 1/4, each tine slender and serrate apically.

Male genitalia ( Fig. 30B View FIGURE 30 ). Uncus spatulate, with a row of stiff setae along lateral margins in distal 1/2. Gnathos hook long, simple. Tegumen approximately 2.5 times as long as uncus, anterior margin indented in pentagon-shape. Valva slender, basal 1/2 slightly curved inward, gradually broadening from base to middle; distal 1/2 setose, slightly curved outward, uniformly elongate, rounded at apex. Anellus lobe approximately 1/2 length of valva, slightly constricted medially, blunt at apex; apical bristle 1/3 length of anellus lobe, hooked. Juxta with a sparsely setose, hummock-like process. Vinculum simple, with posterior margin rounded. Saccus subtriangular, slightly exceeding tegumen pedunculus, blunt at apex. Aedeagus with basal 2/5 dilated, slender distally, apex sharply pointed and curved downward.

Female genitalia ( Fig. 48A View FIGURE 48 ). Papillae anales moderately sclerotized, posterior 1/2 covered with minute spines. Apophyses anteriores 2/3 length of apophyses posteriores. Tergum VIII shorter than sternum VIII, divided into two sclerites. Sternum VIII concave posteriorly, anterior margin strongly produced in U-shape; medial sclerotization with posterior margin emarginate at middle, fan-shaped in posterior 1/3, gradually narrowed from anterior 2/3 to 1/5, anterior 1/5 melanized and curved, reaching base of ductus bursae. Ductus bursae 1/2 length of corpus bursae, with ductus seminalis arising from posterior 1/3. Corpus bursae large elliptical; signum at middle, 1/4 length of corpus bursae, semielliptical with a central ridge.

Variations. The longitudinal median line can vary in length. It is thickened proximally in one specimen examined.

Distribution. China ( Guangxi, Sichuan, Yunnan).

Etymology. The species name is from Latin, albidus (whitish), referring to the white forewing.