Rhaphium shaliuhense, Qilemoge,, Wang, Mengqing & Yang, Ding, 2019

Qilemoge,, Wang, Mengqing & Yang, Ding, 2019, Three new species of Rhaphium from China, with an updated key to Chinese Rhaphium (Diptera, Dolichopodidae, Rhaphiinae), ZooKeys 840, pp. 87-99 : 87

Rhaphium shaliuhense sp. n. Figures 3, 6, 7

Diagnosis.

First flagellomere much elongated, about 7.0 times longer than wide; arista basal segment 0.5 times as long as apical segment. All coxae black, all femora mainly black except hind femur yellow ventrally at base. Fore and mid coxae with yellow bristles, mid coxa apically with a bunch of yellow bristles, hind coxa with one yellow outer bristle. CuAx ratio 0.4. Surstylus finger-like, curved apically and rounded, without distinct bristle. Cercus bifoliate, outer lobe strip-like; inner lobe thick, strip-like, apically with three long and strong bristles.

Description.

Male (Fig. 3). Body length 2.5 mm. Wing length 2.7 mm.

Head metallic green with pale gray pruinescence. Frons with white pruinescence. Face black with pale pruinescence, not as wide as first flagellomere (length). Upper postocular bristles black, middle and lower postocular bristles yellow. Two oc, two vt, two pvt. Antenna (Fig. 6) black; first flagellomere elongated, about 7.0 times longer than wide, apically sharp; arista black, apical position, basal segment 0.5 times as long as apical segment. Proboscis brown with yellow hairs. Palpus brown with black apical bristle and hairs.

Thorax metallic green with pale gray pruinescence. Mesonotum without dark spot. Hairs and bristles on thorax black. Five strong dc, four irregular pairs of acr, two strong npl, one strong sa, two strong pa; scutellum with two pairs of sc, medial pair pubescent, lateral pair strong.

Legs black; all coxae black, all femora mainly black except hind femur yellow ventrally at base. Hairs and bristles on legs black. Fore and mid coxa with yellow bristles, mid coxa apically with a bunch of yellow bristles, hind coxa with one yellow outer bristle. Mid and hind femora each with one preapical bristle. Fore tibia with one ad, one pd, one av, and two apical bristles; mid tibia with two ad, two pd, one av, and three apical bristles; hind tibia with three ad, four pd, two av, and four apical bristles. Relative lengths of tibia and 5 tarsomeres of fore leg 2.7: 1.4: 0.6: 0.5: 0.3: 0.4; mid leg 4.0: 2.1: 1.0: 0.5: 0.4: 0.5; hind leg 5.0: 1.5: 1.3: 1.0: 0.6: 0.5. Wing hyaline, veins black; M bent medially, M and R4+5 parallel apically; CuAx ratio 0.4. Squama yellow with yellow hairs. Halter yellow.

Abdomen entirely metallic green with pale gray pruinescence. Hairs and bristles on abdomen black. Male genitalia (Fig. 7): epandrium black, nearly as long as wide. Surstylus finger-like, curved apically and rounded, without distinct bristle. Cercus bifoliate, outer lobe strip-like, apically with long strong bristles; inner lobe thick, strip-like, apically with three long strong bristles.

Female. Unknown.

Types.

Holotype male, CHINA, Qinghai, Gangchaxian, Shaliuhe, 3,200 m, collected by sweep net in grassland, 2015.VIII.06, leg. Liang Wang.

Distribution.

Palaearctic: China (Qinghai).

Remarks.

The new species is somewhat similar to R. daqinggouense Tang, Wang & Yang, 2016, but the two species can be separated by several features. In R. shaliuhense , there are four pairs of acr, all coxae are black, and the surstylus is finger-like, curved apically (Fig. 7). In R. daqinggouense , there are eight pairs of acr, the all coxae are yellow, except mid coxa is black at basal half, the surstylus is oblanceolate, not curved apically ( Tang et al. 2016: 587, fig. 14).

Etymology.

The specific name refers to the type locality, Shaliuhe.