Argyra sichuanensis, Qilemoge,, Wang, Mengqing & Yang, Ding, 2018

Qilemoge,, Wang, Mengqing & Yang, Ding, 2018, Three new species of Argyra from China (Diptera, Dolichopodidae, Diaphorinae), ZooKeys 772, pp. 141-151 : 141

Argyra sichuanensis sp. n. Figs 5-6, 12-13

Diagnosis.

First flagellomere 1.92 times longer than wide; basal segment of arista 0.18 times as long as apical segment. All coxae black; all femora black, except apical 1/4 of fore femur yellow; hind tibia without av; fore tarsomere II slightly thickened with short thick bristles. CuAx ratio 0.48. Abdominal tergite 2 with large yellow lateral spot. Surstylus deeply incised apically; dorsal lobe nearly strip-like, ventral lobe finger-like, basally wide.

Description.

Male (Fig. 5). Body length 6.9-7.1 mm. Wing length 5.4-5.6 mm.

Head metallic green with pale gray pruinescence. Hairs and bristles on head black. Face brown with pale gray pruinescence, width of face equal to length of first flagellomere. Upper postocular bristles black, middle and lower postocular bristles yellow. Two oc, two vt, two pvt. Antenna (Fig. 12) black; scape with black hairs, pedicel with circlet of black hairs; first flagellomere elongated, 1.92 times longer than wide, apically slightly sharp; arista black, indistinctly pubescent, basal segment 0.18 times as long as apical segment. Proboscis black with brown hairs; palpus black with brown hairs.

Thorax metallic green with pale gray pruinescence. Hairs and bristles on thorax black. Five strong dc, six acr, two strong npl, one strong sa, two strong pa; scutellum with two pairs of sc. Propleuron with one pale bristle. Legs mostly black. All coxae black; all femora black except apical 1/4 of fore femur yellow; all tibiae yellow except apical 1/3 of hind tibia black; fore and mid tarsi from tip of tarsomere I onward black, hind tarsus entirely black. Hairs and bristles on legs black. Fore coxa with eight bristles, mid coxa with six bristles, hind coxa with four outer bristles. All femora with two rows of long ventral bristles, twice as long as width of femur. Fore tibia with one ad, four pd, and three apical bristles; mid tibia with one ad, three pd, three av, and three apical bristles; hind tibia with five ad, six pd, av absent and four apical bristles. Fore tarsomere II slightly thickened with short thick bristles. Relative lengths of tibia and 5 tarsomeres LI 2.5: 1.7: 0.4: 0.4: 0.2: 0.3; LII 3.0: 1.4: 0.7: 0.5: 0.3: 0.2; LIII 2.8: 1.0: 0.5: 0.4: 0.3: 0.2. Wing hyaline, veins black; costal callus indistinct; M bent medially, M and R4+5 parallel apically; CuAx ratio 0.48. Squama yellow with black hairs. Halter yellow.

Abdomen metallic green with pale gray pruinescence. Abdominal tergite II with large yellow lateral spot. Hairs and bristles on abdomen black. Male genitalia (Fig. 13): Surstylus deeply incised apically; dorsal lobe brown, nearly strip-like, with one apical bristle; ventral lobe yellow, finger-like, basally wide, with two bristles. Cercus long, medially wide, with distinct bristles. Hypandrium yellow, long, medially bent, apically rounded.

Female (Fig. 6). Body length 5.4-5.6 mm. Wing length 5.4-5.6 mm. Fore coxa yellow except basally black. Hind femur black apically; hind tibia yellow except apical 1/5 black. Fore tarsomere II normal without short thick bristles. Abdomen without yellow lateral spot.

Types.

Holotype male, CHINA, Sichuan, Pingwu, Wanglang National Nature Reserve, Baixionggou; 2857 m; collected by sweeping nets in grassland; 2016.VIII.06, Yuqiang Xi. Paratypes: 17 males, 448 females, same data as holotype.

Distribution.

Oriental realm: China (Sichuan).

Remarks.

The new species is somewhat similar to A. beijingensis Wang & Yang, but can be separated from the latter by the following features: all femora black, only fore femur yellow at apical 1/4; hind tibia apically black; fore tarsomere II slightly thickened with short thick bristles; dorsal lobe of surstylus apically unobviously inflated, nearly strip-like, with one apical bristle. In A. beijingensis , the ventral surface of the fore and mid femora are black at base, the hind femur is black at apical 1/5; the dorsal lobe of the surstylus is wide, apically distinctly inflated with three bristles (Wang et al. 2004: 386, fig. 2; Yang et al. 2011: 1106, fig. 714).

Etymology.

The specific name refers to the type locality, Sichuan province.