Ashibusa subfalcativalva Li, sp. nov.

urn:lsid:zoobank.org:act: 178D9961-C650-4424-886A-86B27B6CB805

(Figs 11, 19, 27)

Type material. CHINA, Yunnan: Holotype ♂, Yexianggu, Xishuangbanna (22.17°N, 100.87°E), 762 m, 12.VII.2015, leg. KJ Teng & X Bai, slide No. ZD 21404.

Paratypes: 2♀, Yexianggu, Xishuangbanna (22.17°N, 100.87°E), 762 m, 8–12.VII.2015, leg. KJ Teng & X Bai, slide Nos. ZD 21491, ZD21514; 1♂, Lvshilin, Xishuangbanna, 29. V.2015, leg. ZG Zhang, slide No. ZD 21372; 1♂, Yexianggu, Xishuangbanna (22.17°N, 100.87°E), 762 m, 18.VII.2019, leg. KJ Teng et al., slide No. ZD 21526; 1♂, Mt. Jinuo, Jionghong County (22.05°N, 100.98°E), 1003 m, 29.VII.2019, leg. KJ Teng et al., slide No. ZD 21521.

Diagnosis. The new species can be distinguished from its congeners by the forewings with a light greyish brown band from near base to middle along anterior 1/3, and a large elongate black speckle from before middle to near end of fold; in the male genitalia by the subfalcate valvae and the digitate right valvella; and in the female genitalia by the subcircular sterigma.

Description. Adult (Fig. 11). Wingspan 10.0– 11.5 mm.

Head. Vertex and frons white, vertex mixed with pale yellow. Antennae pale yellow, scape white terminally. Labial palpi white, second palpomere mixed with deep brown scales at apex, third palpomere deep brown mixed with yellow at distal 1/4.

Thorax. Dorsum of mesothorax and tegulae white, with yellow scales somewhat forming a yellow stripe along inner margin of tegula. Forewings orange yellow; costal margin with a light greyish brown band from near base to middle along anterior 1/3; black speckle extending from before middle to near end of fold, short cream stripe near its inner margin running to dorsum, small cream spot placed at its outer margin; cream fascia from 1/2 of costal margin extending to dorsum; milky white streak from distal 1/5 of costal margin obliquely inward to termen; white and black scales scattered between cream fascia and milky white streak along dorsal area; fringes yellow, mottled with black. Hindwings and fringes brown. Foreleg with coxa and femur yellowish white mixed with deep brown scales, tibia black, tarsus pale yellow; midleg pale yellow; hindleg with femur yellowish white, tarsus with 1–3 tarsomeres yellow, 4–5 tarsomeres white; tibia of mid- and hindlegs with whorls of bristles yellow basally, black distally.

Male abdomen and genitalia (Fig. 19):

Abdomen. Pleural lobes of eighth segment 3/5 length of valva.

Male genitalia. Socius with right brachium wide at base, narrowed to basal 1/4, uniformly narrow from basal 1/4 to 3/5, distal 2/5 narrower, uniform to near apex, apex narrowly rounded; dorsal process arising from basal 3/5, very short, thorn shaped. Left brachium about half length of right brachium, narrowed from base to basal 1/3, then equally narrow to apex. Valvae subfalcate, distal half slightly wider than basal half, bent outward, with dense setae in distal half ventrally. Left valvella slender, about 3/4 length of phallus, broadened distally; right valvella short, digitate, 1/6 length of phallus. Phallus uniform basally, narrowed to apex distally.

Female genitalia (Fig. 27). Apophyses posteriores twice as long as apophyses anteriores. Sterigma subcircular. Ductus bursae twice as long as apophyses posteriores, membranous. Corpus bursae elliptical, slightly shorter than ductus bursae; entrance at posterior 2/5 of corpus bursae; signum absent.

Distribution. China (Yunnan).

Etymology. The specific epithet of this new species is derived from the Latin subfalcatus and valva, referring to the shape of the valvae in the male genitalia.