Chrysotimus zhui, 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 : 127-128

Taxon classification Animalia Diptera Dolichopodidae

Chrysotimus zhui sp. n. Fig. 16

Diagnosis.

Antenna brown; first flagellomere subtriangular, about as long as wide; acr 9-10 irregular pairs; tarsomere III1 with 2 short black ventral bristles on long kidney-shaped black spot; abdominal dorsum brilliant metallic green; epandrium with long and curved surstylus; cercus long with wide basal part, with long hairs and bristles.

Description.

Male. Body length 1.9-2.0 mm, Wing length 2.2-2.4 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 brown; first flagellomere subtriangular, about as long as wide; arista dorsal, with basal segment very short. Proboscis blackish, with brown hairs; palpus yellow, with yellow hairs and 2 brownish apical bristles.

Thorax metallic green with pale gray pollen, mesonotum and scutellum brilliant. Hairs and bristles on thorax yellow; 6 dc, 9-10 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 4-6 anterior and apical bristles, coxa III with 1 brown outer bristle near middle. Femur II with 1 av and 1 pv apically, femur III with 1 av apically. Tibia II with 2 ad and 2 pd, apically with 3 bristles; tibia III with 2 ad, 2 pd, and row of pv, apically with 3 bristles. All tarsomere 1 each with row of v. Tarsomere III1 with long kidney-shaped black spot at base, with 2 short black ventral bristles at black spot. Relative lengths of tibia and 5 tarsomeres of legs. LI 4.4: 2.8: 1.0: 0.8: 0.5: 0.5; LII 6.0: 3.6: 1.4: 1.0: 0.6: 0.6; LIII 6.4: 2.0: 1.4: 1.0: 0.7: 0.6.

Wing hyaline; veins brownish, R4+5 and M parallel apically; CuAx ratio 0.25. Squama yellow with pale hairs. Halter pale yellow.

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

Hypopygium (Fig. 16) metallic green (except pale hypandrium): Epandrium distinctly longer than wide, apically with 3 epandrial bristles and round short finger-like lateral epandrial process; long and curved surstylus with long bristles; cercus long with wide basal part, with long hairs and bristles; hypandrium short, pale.

Female.

Body length 2.0 mm, Wing length 2.8 mm. Similar to male, with whole abdomen metallic green.

Specimens examined.

Holotype ♂, Tibet: Linzhi Sejila Mountain Kouxi, alt. 3780m, 2012. VIII. 15-18 (M), leg. Chaodong Zhu; Paratype, 1♂ 1♀, same data as holotype. These specimens were collected from the monsoon rainforest with a Malaise trap and are deposited in EMCAU.

Distribution.

Known only from the type locality in Tibet.

Remarks.

This new species is similar to Chrysotimus ningxianus Wang, Yang & Grootaert, but may be separated from the latter by the black spot at tarsomere III1 base, and the epandrium with 1 single finger-like lateral epandrial process. In ningxianus, it has no black spot at tarsomere III1 base, and the epandrium has 2 lateral epandrial processes ( Wang et al. 2005).

Etymology.

The specific epithet derives from the collector of types Dr. Chaodong Zhu (Beijing).