Dolichopus (Dolichopus) ringdahli Stackelberg

Zhang, Lili & Yang, Ding, 2008, New species of Dolichopus Latreille, 1796 from China (Diptera: Dolichopodidae), Journal of Natural History 42 (39 - 40), pp. 2515-2535 : 2530-2532

Dolichopus (Dolichopus) ringdahli Stackelberg

( Figure 5 )

Dolichopus (Dolichopus) ringdahli Stackelberg, 1929, p. 178 .

Material examined

Two males, China: Jilin Prov.: Changbaishan Mt. , 1500–2189 m, 9 August 2004, coll. Liu Xingyue (CAU) .

Diagnosis

Middle and lower postocular bristles pale. Antenna wholly black, first flagellomere 1.1 times longer than wide. Fore coxa yellow, mid and hind coxae black. Cercus nearly triangular.

Redescription

Male. Head metallic green with pale gray pollen. Face nearly as wide as first flagellomere. Hairs and bristles black, middle and lower postocular bristles (including postero-ventral hairs) pale. Antenna ( Figure 5A ) wholly black, first flagellomere 1.1 times longer than wide, obtuse apically; arista black, with basal segment 0.55 times as long as apical segment. Proboscis brown with black hairs; palpus yellow with black hairs and one black apical bristle.

Thorax dark metallic green with pale gray pollen. Hairs and bristles on thorax black. Six strong dc, six to seven paired acr short and hair-like; scutellum with two pairs of bristles (basal pair short and weak) and several pale short marginal hairs. Propleuron pale and black haired, with one black bristle at lower part. Legs yellow, fore coxa yellow with blackish base, mid and hind coxae black except apex. Fore and mid tarsi from apex of tarsomere 1 onward black, apex of hind tibia and hind tarsus black. Hairs and bristles black; mid and hind coxae each with one outer bristle; mid and hind femora each with one preapical bristle. Fore tibia with two ad, two pd and one pv, apically with two bristles; mid tibia with four ad, three pd and one av, apically with four bristles; hind tibia with four ad, four pd and one av, apically with three bristles. Hind tarsomere 1 with two d and one l. Relative lengths of tibia and five tarsomeres LI 1.35 : 0.7: 0.35: 0.25: 0.17: 0.17; LII 1.9 : 1.0: 0.5: 0.45: 0.45: 0.2; LIII 2.0: 0.85: 0.8: 0.55: 0.35: 0.25. Wing hyaline, tinged with grayish, veins brown, M without rudimentary M 2. Costal callus indistinct. CuAx ratio 0.44. Squama yellow with black hairs; halter pale yellow .

Abdomen metallic green with pale gray pollen. Hairs and bristles on abdomen black. Male genitalia ( Figures 5B–D ): Epandrium distinctly longer than wide, inner epandrial lobe short, outer epandrial lobe with two apical bristles; cercus nearly triangular, with finger-like processes and marginal bristles; hypandrium hook-like apically; aedeagus slender.

Female. Unknown.

Measurements of male (mm). Body length 3.4–3.5 mm, wing length 3.2–3.3 mm.

Remarks

The redescription is consistent with the original description except the mid tibia with three pd. In the original description, the mid tibia has two pd ( Stackelberg 1930).

Distribution

China (Jilin), Russia.

Figures

Figure 5. Dolichopus (Dolichopus) ringdahli Stackelberg. (A) antenna; (B) male genitalia (lateral view); (C) cercus; (D) subepandrial lobes and postgonite.