Chrysotimus songshanus Wang, Yang and Grootaert, 2005

Wang, Mengqing, Yang, Ding & Grootaert, Patrick, 2005, Chrysotimus Loew from China (Diptera: Dolichopodidae), Zootaxa 1003 (1), pp. 1-32 : 24-26

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

( Figs. 47–49 )

Diagnosis. Four dc, acr absent. Hind tibia with 3 ad and 5–6 pd; fore tarsomere 1 with row of about 7–8 v; hind tarsomere 1 with 3–4 short black spine­like ventral bristles at base and row of 8–9 pv.

Description. Male. Body length 1.8–1.9 mm, wing length 2.05–2.2 mm.

Head metallic green with pale 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. 48 ) blackish; first flagellomere blackish, rather short, about 0.5 times as long as wide; arista sub­apical, with basal segment very short. Proboscis blackish, with brown hairs; palpus brown, with 2 yellow apical bristles.

Thorax metallic green with pale gray pollen, mesonotum and scutellum brilliant. Hairs and bristles on thorax yellow; 4 strong dc, acr absent; scutellum with 2 pairs of bristles. Propleuron with 1 yellow hair on lower portion. Legs including coxae yellow with all tarsomere 5 brown. Hairs and bristles on legs yellow; coxae with yellowish hairs and bristles; fore coxa with 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 2 av and 1–2 pv apically. Mid tibia with 2 ad and 4 pd, apically with 3 bristles; hind tibia with 3 ad and 5–6 pd, apically with 4 bristles. Fore tarsomere 1 with row of about 7–8 v; hind tarsomere 1 with 3–4 short black spine­like ventral bristles at base, and row of 8–9 pv. Relative lengths of tibia and 5 tarsomeres of legs. LI 3.3: 1.9: 0.9: 0.8: 0.5: 0.5; LII 4.5: 2.6: 1.1: 0.8: 0.5: 0.4; LIII 5.3: 2.0: 1.3: 0.9: 0.6: 0.5.

Wing hyaline ( Fig. 47 ), veins brownish; R 4+5 and M parallel apically, CuAx ratio 0.26. Squama yellow with pale yellow hairs. Halter yellow.

Abdomen brown with pale gray pollen, dorsum dark brown. Hairs and bristles on abdomen yellow.

Male genitalia ( Fig. 49 ). Epandrium distinctly longer than wide, apically with short lateral process; surstylus with short dorsal lobe, thick and curved ventral lobe; cercus somewhat round with moderate long hairs; aedeagus long and thick, with bifurcated apex.

Female. Body length 1.7–2.2 mm, wing length 2.2–2.3 mm. Similar to male, but fore tarsomere 1 without rowed v, and hind tarsomere 1 without black ventral bristles at base.

Type material. Holotype male, BEIJING: Yanqing, Songshan, 15.VII. 2003, M. Wang ( CAU, Beijing) . Paratypes 3 males and 5 females, same data as holotype .

Etymology. The specific epithet derives from the type locality Songshan (Beijing).

Comments. This new species is similar to Chrysotimus shennongjianus Yang and Saigusa from Hubei, but may be separated from the latter by the hind tibia with 3 ad, 5–6 pd, and fore tarsomere 1 with row of 7–8 v. In C. shennongjianus , the hind tibia has 2 ad, 2 pd, and fore tarsomere 1 has no distinct v ( Yang and Saigusa, 2001a).

Distribution. Beijing.

Figures

FIGURES 47–49. Chrysotimus songshanus sp. nov. (male). 47. Wing; 48. first flagellomere, lateral view; 49. genitalia, lateral view.