Chrysotimus ancistrus Yang, Saigusa and Masunaga

Yang, Ding, Saigusa, Toyohei & Masunaga, Kazuhiro, 2008, Species of Chrysotimus Loew from Nepal (Diptera: Empidoidea, Dolichopodidae), Zootaxa 1917, pp. 29-37 : 30

Chrysotimus ancistrus Yang, Saigusa and Masunaga , sp. nov.

( Figs. 1–4 )

Diagnosis. Palpus yellow. All coxae yellow. All femora yellow. Cercus with outer process hook-like apically. Hypandrium short and broad with indistinct apical incision.

Description. Male. Body length 1.3–1.6 mm, wing length 2.1–2.2 mm.

Head metallic green with pale gray pollen. Hairs and bristles on head yellow. Ocellar tubercle weak, with 2 very long oc and 2 very short posterior hairs. Antenna ( Fig. 1 ) black; pedicel with circlet of yellow apical hairs; first flagellomere rather short, about 0.5x as long as wide; arista dorsal, black, with very short pubescence. Proboscis brownish black, with blackish hairs; palpus yellow, with yellow hairs and 2 yellow apical bristles.

Thorax metallic green with pale gray pollen. Hairs and bristles on thorax yellow; 5 strong dc, 6 irregularly paired acr short and hair-like; scutellum with 2 pairs of bristles, outer pair about 0.25x as long as inner pair. Propleuron with 1 yellowish hair and 1 yellowish bristle on lower portion. Legs including coxae yellow with 5th tarsomeres brown. Hairs and bristles on legs brown; coxae with yellowish hairs and bristles; coxa I with 2 long bristles. Femora II and III each with 1 av at apex. Tibia I apically with 2 short bristles; tibia II with 2 ad and 2 pd, apically with 3 bristles; tibia III with 1 ad and 1–2 pd, apically with 3 bristles. Relative lengths of tibia and 5 tarsomeres of legs LI 1.2: 0.7: 0.4: 0.2: 0.15: 0.15; LII 1.5: 0.9: 0.45: 0.25: 0.25: 0.15; LIII 1.9: 0.7: 0.5: 0.4: 0.25: 0.15. Wing hyaline; veins brownish, R4+5 and M parallel apically; CuAx ratio (length of m-cu / length of distal portion of CuA) 0.25. Squama brownish yellow with pale hairs. Halter yellow.

Abdomen metallic green with pale gray pollen. Hairs and bristles on abdomen yellow. Male genitalia ( Figs. 2–4 ): epandrium distinctly longer than wide; surstylus not distinctly separated from epandrium, somewhat acute apically, with 1 long apical bristle; cercus long and rather narrow apically, with long outer process hook-like apically; hypandrium short and broad with indistinct apical incision.

Female. Unknown.

Type material. Holotype male, Nepal: Gupa Pokali (2900 m) - Chouki (2700 m), 16. vi. 1972, J. Emoto. Paratypes: 2 males, same data as holotype.

Distribution. Nepal.

Etymology. The specific name refers to the cercus with outer process hook-like apically.

Remarks. This new species is somewhat similar to Chrysotimus sanjiangyuanus Wang, Yang and Grootaert from Yunnan of China and C. curvispinus sp. nov. in having the triangular first flagellomere and elongated cercus, but may be separated from sanjiangyuanus by the yellow palpus and short surstylus. In C. sanjiangyuanus , the palpus is dark brown, and the surstylus is very long and thin ( Wang, Yang & Grootaert, 2005). In C. curvispinus , coxae II and III are blackish.

Figures

FIGURES 1 – 4. Chrysotimus ancistrus sp. nov., male. 1. Antenna (excluding scape and pedicel), lateral view; 2. genitalia, lateral view; 3. surstylus, ventral view; 4. hypandrium, ventral view. Scale 0.25 mm.