Medetera xiquegouensis, Tang, Chufei, Wang, Ning & Yang, Ding, 2016

Tang, Chufei, Wang, Ning & Yang, Ding, 2016, New species of Medetera from Inner Mongolia, China (Diptera, Dolichopodidae, Medeterinae), ZooKeys 604, pp. 117-144 : 138-140

Taxon classification Animalia Diptera Dolichopodidae

Medetera xiquegouensis sp. n. Figs 10, 28-29, 39

Diagnosis.

Width of face about 1.5 times length of first flagellomere. Six biseriate acr. CuAx ratio 1.25. Ventral surstylus slightly waved at middle, straight at apex, dorsal surstylus wide and U-shaped apically, dilated at basal 1/4, thin at middle to apical 1/4, ventral lobe with one preapical bristle, dorsal lobe with three bristles. Cercus strip-like, without specialized bristle, six times longer than wide.

Description.

Male (Fig. 10). Body length 2.6 mm, wing length 2.5 mm. Head: vertex, frons and face dark metallic green with gray pollinosity; eyes separated, face nearly parallel, width of face about 1.5 times length of first flagellomere. Hairs and bristles on head black except postocular bristles and posteroventral hairs pale yellow. Antenna (Fig. 28) black, first flagellomere rounded, shortly brown pubescent; arista apical, black, bare, with basal segment extremely short, less than 0.1 times length of apical segment. Proboscis black with black apical hairs; palpus black with one black apical bristle.

Thorax metallic green with gray pollinosity, two sa. Hairs and bristles on thorax black. With five pairs of dc, six biseriate acr, two sa. Scutellum with two pairs of sc (median long, strong). Legs all black. Hairs and bristles on legs mainly pale yellow. Fore coxa with eight dorsal bristles at apical 1/2; mid and hind coxae each with one outer bristle at middle. Mid femur with four ventral bristles at basal 1/4 to apical 1/4. Hind tibia with four short dorsal bristles at apical 1/5, expanded apically, with five short apical bristles. Relative length of tibiae and five tarsomeres of legs LI: 3.0: 1.3: 1.0: 0.6: 0.3: 0.3; LII: 4.5: 2.2: 1.3: 0.7: 0.5: 0.5; LIII: 5.0: 1.2:2.1: 1.2: 0.5: 0.5. Wing nearly hyaline, tinged brown; veins brown, R4+5 and M1+2 convergent apically. R4+5 and M1+2 arched towards R2+3. CuAx ratio 1.25. Squama pale white with short pale white hairs. Halter pale yellow.

Abdomen dark metallic green with thin gray pollinosity. Hairs and bristles pale yellow. Male genitalia (Figs 29, 39): Mainly black except epandrial lobes, surstylus, cercus and phallus brown. Hairs and bristles yellow to pale white. Epandrium longer than wide; epandrial lobes forming one long digitation with two slender apical bristles. Ventral surstylus slightly waved at middle, straight at apex, with row of eight short apical bristles; dorsal surstylus wide and U-shaped apically, dilated at basal 1/4, thin at middle to apical 1/4, ventral lobe with one preapical bristle, dorsal lobe with three bristles. Cercus strip-like, somewhat invaginated at ventral margin, with a dentation at apical 2/5 on dorsal margin, narrower at tip, without specialized bristle, with long bristles at dorsal margin and short external bristles, six times longer than wide. Hypandrium simple. Phallus thin, hidden within hypandrium.

Female. Unknown.

Types.

Holotype male, CHINA, Inner Mongolia, Helan Mountain, Xiquekou of Yao Bay (N38°57'57.5", E105°50'52.0"), 1340 m, collected by sweeping nets in grass, 2010.VIII.1,Yan Li (CAU). Paratype: one male, same data as holotype (CAU).

Distribution.

Palaearctic: China (Inner Mongolia).

Remarks.

This new species is somewhat similar to Medetera infuscata , 1974 Negrobov because their legs are both mainly black and the shape of their cercus and hypandrium are quite similar, their dc and acr are similar in size but differ in amount, the new species can be distinguished from the latter by the CuAx ratio and the shape of phallus. In Medetera infuscata , the CuAx ratio is 0.75 and the phallus is apically hooked ( Negrobov and Stackelberg 1974: p 307, figs 580-584).

Etymology.

The species is named for the type locality, Xiquekou.