Chrysotimus sanjiangyuanus Wang, Yang and Grootaert, 2005

Wang, Mengqing, Yang, Ding & Grootaert, Patrick, 2005, Chrysotimus Loew from China (Diptera: Dolichopodidae), Zootaxa 1003 (1), pp. 1-32 : 20-22

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

( Figs. 38–40 )

Diagnosis. Six dc, 3–4 irregularly paired acr. Hairs and bristles on thorax and abdomen brown. Hind tarsomere 1 with group of 5 sparse erect short black ventral bristles on basal 1/4 and row of 7–8 pv.

Description. Male. Body length 2.0– 2.05 mm, wing length 2.2–2.35 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. 39 ) blackish; first flagellomere blackish, about 0.7 times as long as wide; arista dorsal, with basal segment very short. Proboscis blackish, with brown hairs; palpus dark brown, with 2 brown apical bristles.

Thorax metallic green with pale gray pollen, mesonotum and scutellum brilliant. Hairs and bristles on thorax brown; 6 strong dc, 3–4 irregularly paired acr short and hair­like; scutellum with 2 pairs of bristles. Propleuron with 1 blackish bristle on lower portion. Legs including coxae yellow, with all tarsomere 5 brown. Hairs and bristles on legs brownish; fore and mid coxae with yellow hairs and bristles; fore coxa with 2–3 anterior and apical bristles, mid coxa with 3–4 anterior bristles, hind coxa with 1 brown outer bristle near middle. Mid femur with 1 av and 1 short pv apically; hind femur with 1 av and 1 pv apically. Mid tibia with 2 ad and 1 pd, apically with 4 bristles; hind tibia with 1 ad at basal 1/3 and 2–3 pd, apically with 4 bristles. Hind tarsomere 1 with 5 sparse erect short black ventral bristles on basal 1/4, and row of 7–8 pv. Relative lengths of tibia and 5 tarsomeres of legs. LI 3.4: 1.8: 0.8: 0.6: 0.4: 0.4; LII 4.3: 2.5: 1.1: 0.9: 0.4: 0.4; LIII 5.0: 2.0: 1.5: 1.0: 0.6: 0.5.

Wing hyaline ( Fig. 38 ), veins brownish; R 4+5 and M parallel apically, CuAx ratio 0.25. Squama yellow with pale yellow hairs. Halter brownish with yellow knob.

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

Male genitalia ( Fig. 40 ). Epandrium about as long as wide, somewhat square, apically with broad lateral process, and with long and slender process at middle; surstylus long and broad, furcated apically; cercus long, with broad base and long apex, apically with long and strong bristles.

Female. Unknown.

Type material. Holotype male, GUANGXI: Mao’ershan, Sanjiangyuan (1900m), 30. VI. 2003, X. Liu ( CAU, Beijing) . Paratype male, Mao’ershan, Sanjiangyuan (1900m), 30. VI. 2003, Sh. An ( CAU, Beijing) .

Etymology. The specific epithet derives from the type locality Sanjianyuan (Guangxi).

Comments. This new species is similar to Chrysotimus yunlonganus Yang and Saigusa from Yunnan, but may be separated from the latter by hind tarsomere 1 with 5 sparse erect short black ventral bristles on basal 1/4 and row of 7–8 pv, and furcated surstylus. In C. yunlonganus , the hind tarsomere 1 has 8 short black ventral bristles on basal 1/4, and no row of pv; and the surstylus is not furcated apically ( Yang and Saigusa, 2001b).

Distribution. Guangxi.

Figures

FIGURES 38–40. Chrysotimus sanjiangyuanus sp. nov. (male). 38. Wing; 39. first flagellomere, lateral view; 40. genitalia, lateral view.