Chrysotimus xiaohuangshanus Wang, Yang and Grootaert, 2005

Wang, Mengqing, Yang, Ding & Grootaert, Patrick, 2005, Chrysotimus Loew from China (Diptera: Dolichopodidae), Zootaxa 1003 (1), pp. 1-32 : 27-28

Chrysotimus xiaohuangshanus Wang, Yang and Grootaert , sp. nov.

( Figs. 52–54 )

Diagnosis. Six dc, 6–7 irregularly paired acr. Fore and mid tarsomere 1 each with row of 5–6 v; hind tarsomere 1 with about 20 erect short black ventral bristles on basal 1/5 and row of 7–8 pv. Epandrium apically with long and broad process.

Description. Male. Body length 2.2 mm, wing length 2.5 mm.

Head metallic green with pale gray pollen; frons and face brilliant. Hairs and bristles on head brown. Ocellar tubercle weak, with 2 very long oc and 2 very short posterior hairs. Lower postocular bristles (including ventral hairs) pale. Antenna ( Fig. 53 ) blackish; first flagellomere blackish, rather short, about 0.7 times as long as wide; arista dorsal, with basal segment very short. Proboscis brown, with yellow hairs; palpus yellow, with yellow hairs and 2 yellow apical bristles.

Thorax metallic green with pale gray pollen, mesonotum and scutellum brilliant. Hairs and bristles on thorax yellow; 6 strong dc, 6–7 irregularly paired acr short and hair­like; scutellum with 2 pairs of bristles. Propleuron with 1 pale short bristle on lower portion. Legs including coxae yellow with all tarsomere 5 brown. Hairs and bristles on legs yellow; fore and mid coxae with yellow hairs and bristles; fore coxa with 2–3 anterior and apical bristles, mid coxa with 1–2 anterior bristles, hind coxa with 1 brownish outer bristle near middle. Fore femur with 1 short pv apically; mid femur with 1 av apically; hind femur with 1 av and 1 pv apically. Mid tibia with 2 ad, 2 pd, and 1 pv, apically with 4 bristles; hind tibia with 2 ad and 2 pd, apically with 4 bristles. Fore and mid tarsomere 1 each with row of 5–6 yellow v; hind tarsomere 1 with about 20 erect short black ventral bristles on basal 1/5, and row of 7–8 pv. Relative lengths of tibia and 5 tarsomeres of legs. LI 3.2: 2.0: 0.9: 0.7: 0.5: 0.5; LII 4.2: 2.7: 1.1: 0.8: 0.5: 0.5; LIII 5.3: 2.3: 1.4: 1.0: 0.6: 0.5.

Wing hyaline ( Fig. 52 ), veins brownish; R 4+5 and M parallel apically, CuAx ratio 0.28. Squama yellow with pale yellow hairs. Halter yellow.

Abdomen metallic green with pale gray pollen, dorsum brilliant. Hairs and bristles on abdomen brownish.

Male genitalia ( Fig. 54 ). Epandrium about as long as wide, apically with long and broad lateral process, which bearing 4 spine­like apical bristles; surstylus broad, with obtuse process at corner, apically with 3 bristles; cercus round with somewhat acute apex.

Female. Unknown.

Type material. Holotype male, GUANGDONG: Nanling National Natural Reserve, Xiaohuangshan , 9.V.2004, Y. Xu ( CAU, Beijing).

Etymology. The specific epithet derives from the type locality Xiaohuangshan (Guangdong, Nanling).

Comments. This new species is similar to Chrysotimus setosus Yang and Saigusa from Shaanxi, but may be separated from the latter by fore and mid tarsomere 1 each with row of 5–6 v, and epandrium basally with long and broad process. In C. setosus , the fore and mid tarsomere 1 each has no distinct v, and the epandrium has short apical process ( Yang and Saigusa, 2005).

Distribution. Guangdong.

Figures

FIGURES 52–54. Chrysotimus xiaohuangshanus sp. nov. (male). 52. Wing; 53. first flagellomere, lateral view; 54. genitalia, laterial view.