Irepacma flaviptera Wang, sp. nov.

(Figs 4, 12)

Type material. CHINA, Zhejiang: Holotype ♁, Qianjiangyuan (30.39°N, 119.49°E), Mt. Tianmu, 866 m, 8.VII.2014, leg. AH Yin et al., slide No. LiSR16263.

Paratypes: 1♁, same data as holotype, slide No. XZX20376; Guizhou: 1♁, Xiannvtang, Mt. Leigong, 1553 m, 30.VII.2018, leg. ML Zheng et al., slide No. XZX20508 .

Diagnosis. The new species can be distinguished in the male genitalia by the costa with a short subquadrate process at the base, the sacculus distinctly narrowed at distal 1/3, the ventral margin of the valva roundly produced at basal 1/3, and the aedeagus with denticles and long thorns distally.

Description. Adult (Fig. 4). Wingspan 14.0 – 14.5 mm.

Head yellow. Labial palpus and antenna yellow.

Thorax. Mesonotum and tegula yellow, with scattered yellowish brown scales at apex. Forewing yellow, covered with brown scales; discal, discocellular and plical stigmata dark brown; terminal dots brown; fringe yellow. Hindwing and fringe gray, tinged with yellow. Legs yellow, with brown scales.

Male genitalia (Fig. 12). Uncus triangular, with setae medially. Gnathos circular, narrowly banded. Valva narrowed near base, subparallel medially, slightly narrowed from distal 1/4 to obtusely rounded apex, densely setose; ventral margin obtusely produced at basal 1/3; costa with subquadrate process at base, concave semicircularly beyond this process, widened at basal 2/5, then narrowed to before dorso-apex of valva. Sacculus about 2/5 length of valva, narrowed from wide base to basal 2/3, then distinctly narrowed, distal 1/3 triangular, narrowed to apex, with short setae. Saccus subtriangular, apex rounded. Aedeagus slightly shorter than valva, basal 1/4 slenderly clubbed, distal 3/4 wider, bifurcated from its half, forming two branches: one branch slender, clubbed, obtusely rounded at apex; the other branch gradually narrowed to its middle, then widened to apex, with teeth and spines distally.

Female unknown.

Distribution. China (Guizhou, Zhejiang).

Etymology. The specific epithet is derived from the Latin flavus and - pterus, referring to the color of the forewing.