16. Cothornobata uniseta sp. nov.

(Fig. 21)

Diagnosis. Frontal vitta brown but yellow at anterior half. Palpus dark brown. Wing lightly infuscated, discal band nearly indistinguishable. Arms of genital fork strongly divergent basally and convergent on distal 1/3, widest point across arms almost twice as wide as base at midpoint; basal tubercle finger-like, contiguous; medial tubercle strong.

Description. Male. Body length 7.0–9.0 mm, wing length 4.0–6.0 mm.

Head mostly subshiny blackish with very thin gray pollinosity. Frontal vitta brown but yellow at anterior half, densely microsetulose, about 2/3 width of frons; lower orbital plate dull pollinose; ocellar triangle black; median occipital sclerite with a small dark yellow spot at middle; lunule reddish orange; face pale yellow, densely microsetulose; gena yellow, lightly pollinose; clypeus uniformly blackish, shiny. Setae and setulae on head black; postgena with 1 strong seta at lower margin. Antenna orange; first flagellomere 1.6X as long as broad; pedicel with 1 ventral apical seta nearly length of first flagellomere; arista nearly 3.6X length of first flagellomere, brown except base orange, long pubescent with distal half bare. Proboscis dark yellow with brown apex, setulae brown to black. Palpus dark brown, setulae black.

Thorax mostly blackish-brown, except notum darker, proepisternum black posteroventrally; lightly pollinose. Scutellum slightly convex, angled dorsally (Fig. 21 I). Setae on thorax black, setulae blackish; katepisternum with 3 to 4 strong setae.

Legs mostly yellow, except hind coxa brown, fore femur blackish on apical 1/3, mid and hind femora with blackish-brown apex; fore tibia blackish, mid and hind tibiae yellow to brown with darker base and apex; tarsi blackish-brown, except mid basitarsus dark yellow with brown tip.

Wing light brown; distal band brown, basal to middle of distal section of M1; discal band nearly indistinguishable, along M1 but posterior to R4+5. Bm-cu in line with CuA2, A1+CuA2 2.8X as long as CuA2; distance between apex of R2+3 and R4+5 0.6X as long as M1 beyond dm-cu (Fig. 21 C). Halter pale yellow with brown base.

Abdomen blackish-brown, lightly pollinose, except tergites 2–4 pale, pale yellow with pale gray pollinosity apically. Pleuron dark gray. Epandrium brownish-yellow. Genital fork brownish-yellow to brown, with blackishbrown to black setulae; arms strongly divergent basally and convergent on distal 1/3, widest point across arms almost twice as wide as base at midpoint; basal tubercle finger-like, contiguous; medial tubercle strong, broadly convex (Fig. 21 D). Distiphallus inflated apically, glans present. Pregonite long and expanded apically. Postgonite narrow and directed posteriorly (Fig. 21 GH).

Female. Unknown.

Type material. HOLOTYPE: CHINA, Yunnan Province: Xishuangbanna, Menlun, No. 55, 630 m, 6.v.2009, Tingting Zhang (♂, CAU). PARATYPE: CHINA, Yunnan Province: Xishuangbanna, Mengla, Menglun, 800 m, 11.iv.1981, Qikun Yang (2 ♂, CAU); Xishuangbanna, Menlun, No. 55, 24.iv.2007, Hui Dong (1 ♂, CAU); Xishuangbanna, Menlun, No. 55, 24.iv.2007, Wenliang Li (1 ♂, CAU); Xishuangbanna, Mengla, Bubeng Village, 10.v.2009, Tingting Zhang (1 ♂, CAU); Xishuangbanna, Mengla, Bubeng Village, 10.v.2009, Xiushuai Yang (1 ♂, CAU); Xishuangbanna, Mengla, Bubeng Village, 11.v.2009, Tingting Zhang (2 ♂, CAU); Xishuangbanna, Mengla, Bubeng Village, 11.v.2009, Xiushuai Yang (1 ♂, CAU).

Distribution. Oriental: China (Yunnan).

Remarks. Cothornobata uniseta is similar to C. atra sp. nov. and C. elegantula sp. nov., but differs as follows: frontal vitta brown on posterior half and yellow on anterior half; width across arms of the genital fork twice the width of the base. In C. atra sp. nov. and C. elegantula sp. nov. the frontal vitta is yellow only at apex and the maximum width of the genital fork is close to 1.5X the width of the base at midpoint.

Etymology. The specific name refers to the single fronto-orbital seta.