Chrysotimus motuoensis, 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 : 122-123

Taxon classification Animalia Diptera Dolichopodidae

Chrysotimus motuoensis sp. n. Figs 9-10

Diagnosis.

Antenna yellow, with both pedicel and 1st flagellomere both with brown dorsal surface; acr absent; abdomen with tergites brilliantly metallic green dorsally and yellow laterally, and with yellow sternites; tarsomere III1 without black ventral spine-like bristles at base.

Dexcription.

Male. Body length 1.9 mm, wing length 1.9 mm.

Head metallic green with gray pollen; frons and face brilliant; eyes separated distinctly; face wide and slightly narrower towards clypeus. Hairs and bristles yellow. Ocellar tubercle weak, with 2 very long oc and 2 very short posterior hairs. Lower postocular bristles (including ventral hairs) pale. Antenna yellow, with both pedicel and 1st flagellomere with brown dorsal surface; first flagellomere (Fig. 9) rather short, about 0.6 times as long as wide; arista apical, with basal segment very short. Proboscis brown, with pale hairs; palpus pale yellow, with pale hairs and 2 brown apical bristles.

Thorax metallic green with pale gray pollen, with pleura yellow. Hairs and bristles yellow; 6 dc, acr absent; scutellum with 2 pairs of bristles. Propleuron with 1 pale bristle on lower part. 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 2 anterior and apical bristles, coxa III with 1 brown outer bristle near middle. Femora II and III each with 1 apical av. Tibia II with 2 ad and 2 pd, apically with 3 bristles; tibia III with 1 ad and 2 pd, apically with 3 bristles. All tarsomere 1 each with row of v. Tarsomere III 1 without black ventral spine-like bristles at base. Relative lengths of tibia and 5 tarsomeres of legs. LI 3.4: 2.2: 1.0: 0.8: 0.6: 0.4; LII 4.0: 2.4: 1.1: 0.9: 0.5: 0.4; LIII 4.7: 1.0: 1.4: 0.9: 0.6: 0.4.

Wing hyaline; veins brownish, R4+5 and M parallel apically; CuAx ratio 0.3. Squama brown with brown hairs. Halter pale yellow.

Abdomen metallic green with pale gray pollen, tergites brilliant, sternites and lateral portion yellow. Hairs and bristles on tergites dark brown, and pale yellow on sternites.

Hypopygium (Fig. 10): Epandrium with truncate apex bearing 2 epandrial bristles, apically with wide lateral epandrial process; long surstylus with inner spine-like process; cercus somewhat round, with moderately long hairs; hypandrium with round apex.

Female. Body length 1.8 mm, wing length 1.7 mm. Similar to male, but antenna entirely yellow.

Specimens examined.

Holotype ♂, Tibet: Motuo county, alt. 1100m, 2012.VIII.26, leg. Xuankun Li. Paratype, 1 ♀ 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 guangxiensis Yang & Saigusa, but may be separated from the latter by brown proboscis, pale yellow palpus, and the tergites metallic green, sternites and lateral portion yellow. In guangxiensis, it has yellow proboscis, brown palpus, and whole abdomen metallic green ( Yang and Saigusa 2001).

Etymology.

The specific epithet derives from the type locality Motuo (Tibet).