Rhaphium daqinggouense, Tang, Chufei, Wang, Ning & Yang, Ding, 2016

Tang, Chufei, Wang, Ning & Yang, Ding, 2016, Rhaphium (Diptera: Dolichopodidae: Rhaphiinae) from China with six new species, Zootaxa 4162 (3), pp. 581-593 : 588-589

Rhaphium daqinggouense sp. nov.

( Figs 4 , 13–14)

Diagnosis. First flagellomere 6.0 times longer than wide; arista black, 0.25 times as long as first flagellomere ( Fig. 13). 5 dc. All coxae yellow except mid coxa with light black spot. Cercus bifoliate, dorsal lobe thin, ventral lobe wide. Hypandrium with 1 small preapical incision, hook-like apically.

Description. Male ( Fig. 4 ). Body length 2.5–2.9 mm, wing length 2.6–2.8 mm. Head: Frons metallic green with grey white pollinosity; face dark metallic green with thick silvery white pollinosity, nearly as wide as first flagellomere; palpus and proboscis black with black hairs, palpus with 1 black apical bristle; bristles and hairs on head black except postocular bristles and posteroventral hairs pale yellow; antenna black; first flagellomere nearly isosceles triangular, somewhat elongated, rounded at tip, 6.0 times longer than wide; arista black, apical, simple, apical portion broken ( Fig. 13). Thorax metallic green with grey white pollinosity; propleuron covered by short pale yellow bristles; metapleuron narrowly yellowish brown at lower portion; hairs and bristles strong and black; 5 strong dc; 8 pairs of short regular acr which distanced wider from the anterior to posterior portion; median sc normal, lateral sc short and weak. Legs mainly yellow, all coxae yellow except mid coxa black at basal half, tarsi brown to dark brown from tip of tarsomere 1 onwards. Hairs and bristles on legs black except hairs on fore coxa, fore coxa with pale yellow hairs, mid coxa with 2 black outer bristles each at middle and apical 1/3, hind coxa with 1 black outer bristle at middle. Fore tibia with 2 ad each at basal 1/5 and apical 1/5; mid tibia with 4 strong ad, 1 av and 4 apical bristles; hind tibia with 2 ad, 3 weak pd and 3 apical bristles. Relative length ratio from tibia to tarsomere 5: LI: 3.2/1.7/0.6/0.6/0.3/0.2, LII: 4.0/2.0/1.0/0.8/0.6/0.5, LIII: 6.0/2.0/?/?/?/? (hind tarsus broken). Wing hyaline, somewhat brownish; veins dark brown, R4+5 and M somewhat convergent apically; CuAx ratio 0.3. Squama yellow, with fan of pale white bristles; halter yellow. Abdomen metallic green with grey white pollinosity. Bristles and hairs black. Segments 1–5 with pale yellow hairs laterally, sternites 1–4 with pale yellow hairs ventrally. Male genitalia ( Fig. 14): epandrium nearly as long as wide. Surstylus oblanceolate, with some pale strong bristles. Cercus bifoliate, dorsal lobe thin, ventral lobe wide. Hypandrium with 1 small preapical incision, hook-like apically. Phallus simple except apex irregular in shape. Female. Body length 3.3 mm, wing length 2.9 mm. Similar to male except first flagellomere small, 1.1 times longer than wide,

Type material. HOLOTYPE, Ƌ labeled: China: Inner Mongolia, Daqinggou, Primeval forest (N42°82′18″ E122°17′41″), 180 m, collected by sweeping net in grass and brushes, 2014. VII.23, N. Wang & D. Yang ( CAU) . PARATYPES: 6 Ƌ 3 ♀, same data as holotype.

Distribution. Palaearctic: China (Inner Mongolia).

Remarks. The new species is somewhat similar to R. xinjiangense Yang, 1998 from Xinjiang province of China, but may be separated from the latter by the shape of the surstylus and the cercus. In R. xinjiangense , the surstylus is large and has the dense long hairs apically; the cercus is long band-like and does not bifoliate ( Yang et al. 2011).

Etymology. The new species is named after the type locality.

Figures

FIGURE 1 – 6. 1. Rhaphium apophysatum sp. nov.; 2. R. bilobum sp. nov.; 3. R. bisectum sp. nov.; 4. R. daqinggouense sp. nov.; 5. R. dorsiseta sp. nov.; 6. R. neimengense sp. nov. All male. Scale bar = 1.0 mm.