Chrysotimus xuankuni, Wang, Mengqing, Chen, Hongyin & Yang, Ding, 2014

Wang, Mengqing, Chen, Hongyin & Yang, Ding, 2014, Review of the genus Chrysotimus Loew from Tibet (Diptera, Dolichopodidae), ZooKeys 424, pp. 117-130 : 125-127

Taxon classification Animalia Diptera Dolichopodidae

Chrysotimus xuankuni sp. n. Figs 14-15

Diagnosis.

Antenna blackish; first flagellomere rather short, about 0.4 times as long as wide; ac 3-4 irregular pairs; tibia I with row of 8-9 d; abdomen whole brilliant metallic green; tarsomere III1 with 5-6 short black ventral bristles at base; epandrium without distinct lateral process; cercus round, with moderate hairs.

Description.

Male. Body length 1.5 mm, Wing length 1.6 mm.

Head metallic green with gray pollen; frons and face brilliant; eyes separated distinctly. 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 blackish; first flagellomere (Fig. 14) rather short, about 0.4 times as long as wide; arista dorsal, with basal segment very short. Proboscis blackish, with brown hairs; palpus brown, with brown hairs and 2 brown apical bristles.

Thorax metallic green with pale gray pollen, mesonotum and scutellum brilliant. Hairs and bristles on thorax yellow; 6 dc, 3-4 irregular paired acr; scutellum with 2 pairs of bristles. Propleuron with 1 pale bristle on lower portion. Legs including coxae yellow with 5th tarsomeres brown. Hairs and bristles on legs pale yellow; coxa I with 3-4 anterior and apical bristles, coxa II with 3-4 anterior and apical bristles, coxa III with 1 brown outer bristle near middle. Femora II and III each with 1 av apically. Tibia I with row of 8-9 d; tibia II with 2 ad and 2 pd, apically with 3 bristles; tibia III with 1 ad, 2 pd, apically with 3 bristles. All tarsomere 1 each with row of v. Tarsomere III1 with 5-6 short black ventral bristles at base. Relative lengths of tibia and 5 tarsomeres of legs. LI 4.2: 2.0: 1.0: 0.8: 0.6: 0.6; LII 5.2: 2.4: 1.6: 1.2: 0.6: 0.6; LIII 5.2: 1.4: 1.4: 0.8: 0.6: 0.6.

Wing hyaline; veins brownish, R4+5 and M parallel apically; CuAx ratio 0.28. Squama yellow with pale hairs. Halter brownish.

Abdomen metallic green with pale gray pollen, tergites and sternites brilliant. Hairs and bristles on abdomen dorsal dark brown.

Hypopygium (Fig. 15): Epandrium with wide apex, apically with invision, bearing 2 epandrial bristles, but no distinct lateral epandrial process; long and thick surstylus with curved apex; cercus round, with moderate hairs; hypandrium shorter than epandrium.

Female.

Body length 1.5-1.6 mm, Wing length 1.5-1.6 mm. Similar to male, with whole abdomen metallic green.

Specimens examined.

Holotype ♂, Tibet: Motuo county, alt. 1100m, 2012. VII. 26, leg. Xuankun Li. Paratype, 2♀♀, same data as holotype. These specimens were collected from the subtropical rainforest with a sweep net and are deposited in EMCAU.

Distribution.

Known only from the type locality in Tibet.

Remarks.

This new species is similar to Chrysotimus guangdongensis Wang, Yang & Grootaert, but may be separated from the latter by the rowed d on tibia I, and the epandrium bearing no distinct lateral process. In guangdongensis, it lacks distinct rowed d on tibia I, and features a lateral process of the epandrium ( Wang et al. 2005).

Etymology.

The specific epithet derives from the collector of type species Xuankun Li.