Promalactis libona Wang & Liu 2020, sp. nov.

Promalactis libona Wang, sp. nov.

(Figs 11, 28, 42)

Type material. CHINA, Guizhou: Holotype ♂, Pobao (25.36°N, 107.96°E), Shuizu Town, Limingguan, Libo County, 740 m, 20.VII.2015, leg. MQ Yang & JE Lee, slide No. JYY17787. Paratypes: 31♀, same data as holotype, slide Nos. JYY17722 ♀, LC19436 ♀, LC19443 ♀, LC19444 ♀, LC19445 ♀.

Diagnosis. The new species is similar to P. ramispinea Du et Wang, 2013 in male genitalia, but it can be distinguished by the distal process of the valva less than half the length of the uncus, and the aedeagus with a cornutus basally sub-rectangular and distally bearing seven spines. In P. ramispinea, the distal process of the valva is longer than half the length of the uncus, and the cornutus is narrow basally and has nine apical spines (Du & Wang 2013: 32, fig. 22).

Description. Adult (Fig. 11). Wingspan 9.0–12.0 mm. Head greyish brown. Labial palpus with second seg-ment grey on inner surface, black on outer surface; third segment black except white at base and apex. Antenna with scape white on dorsal surface, grey on ventral surface; flagellum black alternated with white on dorsal surface, greyish brown on ventral surface. Thorax and tegula dark ochreous brown on basal half, yellowish brown on distal half. Forewing ochreous yellow; markings white edged with black scales: costal spot sub-rectangular, from basal 3/5 oblique outward to above posterior angle of cell, with a small black spot on inner margin and a large black patch placed on outer margin anteriorly; cell with a horizontal streak at basal 1/3; fold with a short slim streak at base, a short straight streak at basal 2/5 oblique outward and almost touching streak in cell, an arched streak at distal 1/3, and an obscure dot at end; dorsum with three white streaks: one near base, not reaching fold, second streak from basal 2/5 meeting second streak at fold, third streak from basal 3/4 meeting third streak at fold; apical and terminal spots relatively smaller, surrounded by dense black scales; tornal spot black, diffused to below posterior angle of cell anteriorly, diffused to before end of fold from inside; cilia ocherous yellow, mixed with black on extension of tornal spot. Hindwing and cilia grey. Fore- and midlegs black, fore femur and midleg brownish grey ventrally, tibiae with a white spot at base and middle, with a tuft of white scales apically, tarsi white at basal two tarsomeres; hindleg dark grey, except black tarsus white at apices of each tarsomere.

Male genitalia (Fig. 28). Uncus conical, with sparse setae laterobasally, pointed at apex. Gnathos shorter than uncus; mesial plate lingulate, with scale-like protuberances on distal 1/3, slightly narrowed distally, obtuse apically, with a small membranous apical process; basal arm short, about half length of mesial plate. Tegumen divided from posterior 2/5; lateral arm slightly narrowed anteriorly. Valva wide at base, narrowed toward apex, produced to a setose thumb-shaped dorsodistal process curved downward, less than half length of uncus; costa concave at base, slightly convex medially; sacculus wide at base, narrowed to apex, sinuate dorsally, setose distally, weakly concave at apex. Saccus almost as long as uncus. Juxta large and broad, slightly widened to obtuse posterior margin; lateral process from about middle, slender basally, widened in lanceolate shape and setose distally; basal lobe short, subovoid. Aedeagus slightly longer than valva, straight, placed medially; cornutus basally sub-rectangular, distally bearing about seven spines of different lengths, two longest spines about 1/3 length of aedeagus.

Female genitalia (Fig. 42). Apophyses anteriores about 1/3 length of apophyses posteriores. Eighth sternum sub-rectangular, with sparse setae, rounded on posterior margin. Lamella postvaginalis a narrow sclerotized band. Antrum almost uniformly narrow, short. Ductus bursae about twice length of corpus bursae, posterior 3/5 dilated, with many spines, anterior 2/5 membranous, narrowed at anterior 2/5, then widened toward corpus bursae. Corpus bursae membranous, sub-rounded; with two ovate signa.

Distribution. China (Guizhou).

Etymology. The specific epithet of this new species refers to the type locality, Libo County, Guizhou Province.