Chrysosoma zengchengense, Zhu & Yang, 2005

Chrysosoma zengchengense View in CoL sp. nov.

( Figs. 8–10 View FIGURES 8–10 )

Diagnosis. Antenna black; arista with lanceolate apical flag; frons with 1 long pale hair on postero­lateral slope; CI blackish, CII and CIII black; FI with row of spine­like ventral bristles (the longest bristles 3 times as long as width of FI).

Description. Male body length 5.0– 5.2 mm, wing length 5.3–5.5 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 long pvt and 1 long pale 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 thick dorsal and 1 long thick ventral bristles); first flagellomere triangular, nearly as long as wide; arista apical, black, with lanceolate apical flag ( Fig. 8 View FIGURES 8–10 ), much longer than head + thorax. Proboscis yellow with brownish hairs; palpus dark brown 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 long irregularly paired acr; scutellum with 2 pairs of sc, basal pair weak. Legs yellow; CI blackish, CII, CIII and trochanters black; It 2­5 and IIt 2 brown, IIt 3­5 and IIIt 2­5 dark brown. Hairs and bristles on legs black; coxae with pale hairs, CI with lateral hairs and 2 spine­like apico­lateral bristles; CII with lateral hairs, and 2 spine­like apico­lateral bristles; CIII with group of outer long pale hairs. Femora long with pale ventral hairs; FI with row of spine­like ventral bristles (the longest bristles 3 times as long as width of FI); FII and FIII with row of long hair­like av and pv. TI with 2 ad and 1 pv at apical 1/5, apically with 2 short bristles; TII with 1 ad at basal 1/6, 1 long av at basal 1/6 and 2 short av, apically with 1 long and 2 short bristles; TIII with 2 ad, 6 – 7 pv, apically with 2 long and 1 short bristles. It 1 somewhat flattened with very short dense ventral pubescence on basal 4/5 ( Fig. 9 View FIGURES 8–10 ); IIt 2 with 5 av and 5 pv; IIIt 1 with 1 av at extreme base. Relative lengths of tibia and tarsomeres: LI 2.5: 1.6: 0.7: 0.5: 0.3: 0.2; LII 3.9: 2.9: 1.8: 0.7: 0.3: 0.2; LIII 5.5: 2.2: 1.1: 0.8: 0.4: 0.3. Wing: hyaline, tinged with brown; veins dark brown, M 1 concave, crossvein m­cu straight. Squama dark yellow, margin pale with pale hairs. Halter yellowish with yellow knob.

Abdomen dark metallic green with gray pollen. Hairs and bristles on segments 1–4 pale, but sterna 5 – 7 with black bristles.

Male genitalia ( Fig. 10 View FIGURES 8–10 ): Epandrium much longer than wide with 1 lateral hair; surstylus rather thick, basally with a short finger­like lateral process; hypandrium with narrow left lateral arm, nearly reaching apex of aedeagus; cercus furcate, with long black bristles.

Female. Unknown.

Type material. Holotype male, Guangdong: Zengcheng, Nankunshan , 23°18’N, 113°49’E, 14. 07. 2003, leg. Xingyue Liu. GoogleMaps Paratypes 2 males, same data as holotype but leg. Shuwen An GoogleMaps ; 1 male, same data as holotype but 15. 07. 2003, leg. Shuwen An. GoogleMaps

Distribution. China ( Guangdong).

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

Remarks. The new species is very similar to C. hainanum , but can be easily recognized by the following characters: fore coxa blackish, male cercus furcated; in C. hainanum , fore coxa yellow, male cercus long and finger­like.