Chrysotimus dalongensis Wang, Chen & Yang

Wang, Mengqing, Chen, Hongyin & Yang, Ding, 2012, Species of the genus Chrysotimus Loew from China (Diptera, Dolichopodidae), ZooKeys 199, pp. 1-12 : 5-7

Chrysotimus dalongensis Wang, Chen & Yang sp. n. Figs 1-3

Diagnosis.

Acr 5-6 irregularly paired. Mid and hind tibiae each with 2 ad and 2 pd. Fore, mid and hind tarsomere 1 each with row of 5-7 v. Epandrium apically with long and wide lateral process, trifurcated apically; surstylus long and curved inward apically, with hook curved backwards.

Description.

Male. Body length 2.25-2.45 mm, wing length 2.30-2.45 mm.

Head metallic green with gray pollen; frons and face brilliant. Hairs and bristles on head yellow. Ocellar tubercle weak, with 2 very long oc and 2 very short posterior hairs. Lower postocular bristles (including ventral hairs) pale. Antenna (Fig. 1) black ish; first flagellomere blackish, rather short, about 0.5 times as long as wide; arista dorsal, with basal segment very short. Proboscis brown, with brown hairs; palpus pale yellow, with pale hairs and 2 pale yellow apical bristles.

Thorax metallic green with pale gray pollen, mesonotum and scutellum brilliant. Hairs and bristles on thorax yellow; 6 dc, 5-6 irregularly paired acr short and hair-like; scutellum with 2 pairs of bristles. Propleuron with 1 pale bristle on lower portion. Legs including coxae yellow with 5th tarsomere brown. Hairs and bristles on legs yellow; coxae with yellowish hairs and bristles; fore coxa with 3-4 anterior and apical bristles, mid coxa with 2-3 anterior and apical bristles, hind coxa with 1 brown outer bristle near middle. Mid femur with 1 av apically; hind femur with 1 short av and 1 short pv apically. Mid tibia with 2 ad and 2 pd, apically with 4 bristles; hind tibia with 2 ad and 2 pd, apically with 3 bristles. Fore and mid tarsomere 1 each with row of 6-7 v. Hind tarsomere 1 with 6-8 short and thick black ventral bristles at base, and row of 5-6 pv. Relative lengths of tibia and 5 tarsomeres of legs. LI 2.4: 1.4: 0.6: 0.5: 0.3: 0.3; LII 3.3: 2.1: 0.8: 0.6: 0.4: 0.3; LIII 3.5: 1.4: 0.9: 0.6: 0.4: 0.3.

Wing hyaline; veins brownish, R4+5 and M parallel apically; CuAx ratio 0.3. Squama yellow with pale yellow hairs. Halter pale yellow.

Abdomen metallic green with pale gray pollen, dorsum brilliant, sterna 1-2 yellow. Hairs and bristles on abdomen brown.

Male genitalia (Figs 2-3) dark brown: Epandrium distinctly longer than wide, apically with long and wide lateral process, trifurcated apically; surstylus long and curved inward apically, with curved backwards hook; cercus round, with moderately long hairs; hypandrium indistinct.

Female. Unknown.

Type material.

Holotype ♂, Hubei: Shennongjia, Dalongtan pound (31°75'N, 110°67'E), 30.VI.2009, Qifei Liu. Paratypes, 12♂♂, same data as holotype; 5♂♂, Hubei: Shennongjia, Dapingqian (31°75'N, 110°67'E), 7. VII. 2009, Qifei Liu. Type specimens are stored in 75% ethanol.

Distribution.

Known only from the type locality in Hubei.

Remarks.

This new species is similar to Chrysotimus acutatus Wang, Yang & Grootaert, but may be separated from the latter by 2 ad on hind tibia, and and by the long, wide, trifurcated lateral process on epandrium. In Chrysotimus acutatus , the hind tibia has 1 ad, and the lateral epandrial process is short and bifurcated ( Wang et al. 2005).

Etymology.

The specific epithet is derived from the type locality Dalong (Hubei).