Nasimyia nigripennis sp. nov.

(Figs 11–20)

Diagnosis. Body more slender, head only slightly broader than thorax (Fig. 11); last flagellomere swollen toward apex (Fig. 17); wing brownish infuscate, darker anterior margin not interrupted by contrasting hyaline area (Fig. 12); posterior margin of male genital capsule slightly emarginated in middle (Fig. 20), aedeagal complex with short proximal part (Fig. 19).

Descriptions. Male. Body length 4.0–5.0 mm, wing length 3.5–4.2 mm.

Head (Figs 11, 13–14) hemispherical, width of head equal to thoracic width at wing base, about 0.6 times as long as broad in dorsal view and 0.8 times longer than high in profile. Other characters as in preceding species but scape and pedicel rather yellow and last flagellomere distinctly swollen. Relative length of antennal scape, pedicel and flagellomeres as 1.5:1.6:1.8:1.5:1.2:1.2:1.7:1.5:1.5:2.3, they relative width of antennal scape, pedicel and flagellomeres 0.7:0.7:0.7:0.8:0.8:0.8:1.0:0.8:0.8:1.4. Face shining black, with blackhairs on facial projection, remaining part with white hairs. Palpus dark brown to black.

Thorax (Fig. 11) relatively stout, approximately 1.7 times longer than wide, yellow line between postpronotal callus and wing base not visible. Legs yellow, each tarsus darkened apically, with yellowish brown short hairs. Wing (Fig. 7) brown infuscated with dark brown anterior margin.

Abdomen (Fig. 11) narrower than the thorax, approximately 3.0 times longer than wide. Coloration and pubescence as in N. megacephala . Male genitalia (Figs. 18–20) yellowish brown to dark brown; epandrium (Fig. 18) trapezoid, broader than proctiger; each original gonocoxite (Figs. 20) with a dark elliptical spot near basis of gonostylus; aedeagal complex (Fig. 19) tripartite in distal part, lobes twice as long as length of undivided proximal part.

Female. Body length 5.0–6.0 mm, wing length 4.0–5.0 mm. Head (Figs 15–16) with separated eyes, about 0.7 times as long as broad in dorsal view and 0.8 times longer than high in profile; frons shining black, bare in central area, without longitudinal median groove, broadened toward anterior margin; upper frons with lateral longitudinal line consisting of short white hairs along each eye margin; the narrowest width of frons occupying about one third of head width. Abdominal cercus two-segmented.

Specimens examined. Holotype 3, China, Yunnan Province, Mt. Laifengshan, 1400m, Tengchong, 6.vi.2009, Zaihua Yang & Bin Li legs. Paratypes: 123, 6ƤƤ, with same labels as holotype; 13, 2ƤƤ, Mts. Gaoligong, 1800–2400m, Baoshan, Yunnan Province, 29.v. – 3.vi. 2009, Zaihua Yang & Bin Li legs.

Etymology. The specific name is composed from the Latin words “niger” (= black) and penna (= wing) referring to the blackish wing.

Remarks. This new species is similar to P. megacephala sp. nov., but it can be distinguished by the more slender body, the head only slightly broader than the thorax, the distinctly swollen last flagellomere and the brownish infuscate wing without any contrasting hyaline spots although the anterior margin is distinctly darker than the rest of the membrane.