Chrysotimus huairouensis Wang, Chen & Yang

Wang, Mengqing, Chen, Hongyin & Yang, Ding, 2012, Species of the genus Chrysotimus Loew from China (Diptera, Dolichopodidae), ZooKeys 199, pp. 1-12 : 7-9

Chrysotimus huairouensis Wang, Chen & Yang sp. n. Figs 4-6

Diagnosis.

First flagellomere somewhat trapeziform, about 0.8 times as long as wide. Acr absent. Hind tibia with 1 ad, 3 pd and row of v. Hind tarsomere 1 with 18-20 short and thick black ventral bristles at base. Epandrium apically with wide lateral process, process truncate apically; surstylus curved and somewhat swollen apically.

Description.

Male. Body length 2.1-2.3 mm, wing length 2.0-2.3 mm.

Head metallic green with 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. 4) blackish; first flagellomere blackish, somewhat trapeziform, rather short, about 0.8 times as long as wide; arista dorsal, with basal segment very short. Proboscis dark brown, with blackish hairs; palpus pale yellow, with pale hairs and 2 pale yellow apical bristles.

Thorax metallic green with pale gray pollen, mesonotum and scutellum brilliant. Hairs and bristles on thorax yellow; 6 dc, no acr; scutellum with 2 pairs of bristles. Propleuron with 1 pale bristle on lower portion. Legs including coxae yellow with 5th tarsomere brown. Hairs and bristles on legs brown; coxae with yellowish hairs and bristles; mid and hind coxae each with 1 brown outer bristle. Mid and hind femura each with 1 av apically. Mid tibia with 2 ad and 2 pd, apically with 4 bristles; hind tibia with 1 ad, 3 pd and one row of v, apically with 3 bristles. Hind tarsomere 1 with 18-20 short and thick black ventral bristles at base. Relative lengths of tibia and 5 tarsomeres of legs. LI 3.2: 2.2: 0.9: 0.7: 0.6: 0.6; LII 4.2: 2.6: 0.9: 0.6: 0.4: 0.3; LIII 5.6: 2.4: 1.3: 1.0: 0.7: 0.6.

Winghyaline; veins brownish, R4+5 and M parallel apically; CuAx ratio 0.23. Squama pale yellow with yellow hairs. Halter pale yellow.

Abdomen metallic green with pale gray pollen, dorsum brilliant, sterna 1-4 yellow. Hairs and bristles on abdomen yellow.

Male genitalia (Figs 5-6) dark brown: Epandrium distinctly longer than wide, apically with wide lateral process, process truncate apically; surstylus long and finger-like, curved and somewhat swollen apically; cercus round, with moderately long hairs; hypandrium shorter than epandrium.

Female. Unknown.

Type material.

Holotype ♂, Beijing: Huairou, Labagou (40°32'N, 116°63'E), 29.VII.2009, Yan Li. Paratype 1 ♂, same data as holotype. Type specimens are stored in 75% ethanol.

Distribution.

Known only from the type locality in Beijing.

Remarks.

This new species is similar to Chrysotimus dorsalis Yang, but may be separated from the latter by the single row of v on the hind tibia, and slender surstylus. In Chrysotimus dorsalis , the hind tibia lacks row of v, and the surstylus is wide ( Yang 2001).

Etymology.

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