Chrysosoma nanlingense, Zhu & Yang, 2005

Zhu, Yajun & Yang, Ding, 2005, New species of Chrysosoma Guérin-Méneville (Diptera: Dolichopodidae), with a key to Chinese species, Zootaxa 1029 (1), pp. 47-60 : 50-51

Chrysosoma nanlingense sp. nov.

( Figs. 1–3 )

Diagnosis. Antenna black; frons with 1 pale curved hair on postero­lateral slope; coxae black; FI with row of long ventral hairs (the longest hair twice as long as width of FI).

Description. Male body length 5.8–8.5 mm, wing length 6.0– 8.3 mm.

Head metallic green with pale gray pollen; vertex distinctly excavated, frons subshining. Hairs and bristles on head black; middle and lower postocular bristles (including postero­ventral hairs) pale; frons with 1 strong pvt and 1 pale curved hair on postero­lateral slope, ocellar tubercle with 2 long strong oc. Antenna black; scape somewhat swollen; pedicel with circlet of apical bristles (including 1 long dorsal bristle); first flagellomere triangular, as long as wide; arista apical, black, simple, 1.6 times longer than head + thorax. Proboscis brownish with blackish hairs; palpus blackish with brown hairs and 2 black bristles.

Thorax metallic green with pale gray pollen. Hairs and bristles on thorax black; 2 strong posterior dc and 3 anterior hairs; 3–4 long irregularly paired acr; scutellum with 2 pairs of sc, basal pair short and weak. Legs brownish yellow; coxae and trochanters black; It 1 brown, It 2­5 and IIt dark brown, III t blackish. Hairs and bristles on legs black; coxae with pale hairs. CI with 2 spine­like apico­lateral bristles; CII with 1 spine­like apico­lateral bristle at apical 1/5. Femora with pale ventral hairs: FI with row of long ventral hairs (the longest hairs twice as long as width of FI); FII and FIII with row of short hair­like av and pv on basal half (as long as width of corresponding FII and FIII). TI with 1 ad at basal 1/6, 1 pd at middle and 2 pv, apically with 3 bristles; TII with 3 ad, apically with 3 bristles; TIII with 10–14 pd and 1–3 av, apically with 3 bristles. It 1 apical 4/5 and It 2­5 somewhat flattened with very short dense ventral pubescence ( Figs. 1–2 ). Relative lengths of tibia and tarsomeres: LI 4.0: 3.4: 0.9: 0.7: 0.5: 0.3; LII 6.9: 5.3: 1.3: 1.0: 0.6: 0.4; LIII 8.3: 3.2: 1.5: 0.9: 0.5: 0.3. Wing hyaline, tinged with brown, veins dark brown; M 1 concave, crossvein m­cu moderately sinuate. Squama dark yellow with dark brown hairs. Halter yellowish with pale knob.

Abdomen dark metallic green with gray pollen. Hairs and bristles on abdomen black, but sterna 1–2 with pale hairs.

Male genitalia ( Fig. 3 ): Epandrium distinctly longer than wide with 2 short lateral hairs; surstylus rather thick, apically with some weak bristles and basally with a short finger­like lateral process; hypandrium with narrow left lateral arm, nearly reaching apex of aedeagus; cercus furcate, with long pale bristles.

Female. Unknown.

Type material. Holotype male, Guangdong: Nanling, Shumuyuan , 500 m, 23°20’N, 115°23’E, 08. 05. 2004, leg. Ding Yang. Paratype 1 male, same data as holotype .

Distribution. China (Guangdong).

Etymology. The specific name refers to the type locality Nanling.

Remarks. The new species is quite similar to C. cyaneculiscutum in the color of antennae, coxae and legs, but can be easily separated from the latter by the following characters: palpus blackish, 2 strong posterior dc and 3 anterior hairs, It 1 somewhat flattened with very short dense ventral pubescence on basal 4/5; in C. cyaneculiscutum , palpus yellowish, 2 strong posterior dc and 4 anterior hairs, It 1 somewhat flattened with very short dense ventral pubescence on basal 1/3.

Figures

FIGURES 1–3. Chrysosoma nanlingense sp. nov. (Male). 1. Left It1, right lateral view; 2. left It2­5, right lateral view; 3. genitalia, lateral view.