Argyra pingwuensis, 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 pingwuensis sp. n. Figs 3-4, 10-11

Diagnosis.

First flagellomere 2.1 times longer than wide; arista with basal segment 0.18 times as long as apical segment. All coxae black; basal 1/3 of fore and mid femora black, apical 1/3 of hind femur black; apical 1/4 of hind tibia black, av absent. CuAx ratio 0.43. Abdominal tergites 1-2 with yellow lateral spot. Surstylus deeply incised apically; dorsal lobe basally thin, apically inflated obviously; ventral lobe finger-like, ventrally with one protuberance.

Description.

Male (Fig. 3). Body length 6.2-6.5 mm. Wing length 5.3-5.5 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. 10) brown; scape with black hairs, pedicel with circlet of black hairs; first flagellomere elongated, 2.1 times longer than wide, apically slightly sharp; arista brown, indistinctly pubescent, basal segment 0.18 times as long as apical segment. Proboscis brown with brown hairs; palpus black with black 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 with all coxae black; basal 1/3 of fore and mid femora black, apical 1/3 of hind femur black; fore and mid tibiae yellow, apical 1/4 of hind tibia black; fore and mid tarsi from tip of tarsomere 1 onward black, hind tarsus entirely black. Hairs and bristles on legs black. Fore coxa with two bristles, mid coxa with five bristles, hind coxa with two black outer bristles. All femora with two rows of long black ventral bristles, twice as long as width of femur. Fore tibia with one ad, two pd, and three apical bristles; mid tibia with two ad, four pd, three av, and five apical bristles; hind tibia with eight ad, eight pd, av absent and three apical bristles. Relative lengths of tibia and 5 tarsomeres LI 3.2: 2.3: 0.5: 0.4: 0.2: 0.3; LII 5.2: 3.1: 1.2: 1.0: 0.6: 0.4; LIII 6.7: 2.4: 1.7: 1.2: 0.7: 0.5. Wing hyaline, veins black; costal callus indistinct; M bent medially, M and R4+5 parallel apically; CuAx ratio 0.43. Squama yellow with brown hairs. Halter yellow.

Abdomen metallic green with pale gray pruinescence, except tergites 1-2 with yellow lateral spot. Hairs and bristles on abdomen black. Male genitalia (Fig. 11): Surstylus deeply incised apically; dorsal lobe brown, basally thin, apically inflated obviously, with one long bristle; ventral lobe yellow, except dorsal surface brown, finger-like, basally wide, with two bristles, ventrally with protuberance. Cercus long, basally wide, apically slightly acute with distinct bristles. Hypandrium yellow, long and slightly bent medially.

Female (Fig. 4). Body length 5.4-5.6 mm. Wing length 5.4-5.6 mm. Similar to male except: Fore coxa yellow except basally black and all femora yellow. Abdomen tergite 2 with yellow lateral spot.

Types.

Holotype male, CHINA, Sichuan, Pingwu, Wanglang National Nature Reserve; 2930m; collected by sweeping nets in grassland; 2016.VIII.3, Yuqiang Xi. Paratypes: three males, four females, same data as holotype; four males, one female, CHINA, Sichuan, Pingwu, Wanglang National Nature Reserve; collected by yellow pan traps in grassland; 2016.VIII.5, Yuqiang Xi.

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: fore and mid femora black at base 1/3, hind femur black at apical 1/3, hind tibia black at apical 1/4; dorsal lobe of surstylus with one long 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 has 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, Pingwu.