Nephrotoma nigrohalterata Edwards, 1928

Yang, Qi-Cheng, Liu, Qi-Fei, Pan, Zhao-Hui, Liu, Xiao-Yan & Yang, Ding, 2020, Nephrotoma Meigen (Diptera, Tipulidae) from Xizang Autonomous Region, China, ZooKeys 973, pp. 123-151 : 123

Nephrotoma nigrohalterata Edwards, 1928 Figs 43-45 , 46-51 , 62

Nephrotoma nigrohalterata Edwards, 1928: 700. Type locality: China: Szechwan-Tibet border, Yien-Long-Shien.

Nephrotoma attenuata Alexander, 1935: 135. Type locality: China: Szechwan-Tibet border, Yien-Long-Shien.

Diagnosis.

Vertex with round, dark-brown spot near inner margin of eye; dorsal part of rostrum including nasus brownish black. Antenna black (Figs 43 , 44 ). Tergite 9 distinctly depressed (Fig. 46 ). Sternite 9 with a brown, horn-like projection. Outer gonostylus greatly produced and slender (Figs 47 , 50 ).

Material examined.

12 male (CAU), China: Xizang, Bayi, 2017.VI.2, 2950 m, Qicheng Yang (light trap).

Description.

Male (n = 12): body length 10.5-12.5 mm, wing length 10.5-12.5 mm, antenna length 3.5-5.0 mm.

Head (Figs 43 , 44 ). Mainly yellow. Vertex with round, dark-brown spot near inner margin of eye. Occipital marking dark brown, subtriangular. Face with obvious linear marking. Posterior margin of postgena brown. Dorsal part of rostrum including nasus brownish black. Head with black hairs. Antenna black with dense villi; first flagellomere 1.2 times longer than second one. Proboscis mainly yellow, with brown hairs. Palpus greyish brown, with brown hairs.

Thorax (Figs 43 , 44 ). Mainly yellow. Pronotum mainly yellow, with large, brown spots on lateral side. Prescutum with three black longitudinal stripes, middle stripe extended to scutum, anterior end of lateral prescutal stripe slightly bent outward. Scutum with two black spots. Scutellum dark brown. Mediotergite with a brown longitudinal stripe at middle. Anepisternum and katepisternum each with large black spot, posterior margin of anepisternum and katepisternum black; spot of anepisternum tilted V-shaped. Anepimeron and katepimeron each with small pale brown spot. Meron with black lower portion. Anatergite yellow, katatergite with black lower margin. Parascutellum yellow. Legs yellow, except anterior margin of coxae brown black, tips of tibiae and femora brown; hairs brownish except those on coxae yellow. Wing subhyaline, tinged with light brown; pterostigma greyish brown; vein of cell m1 shortly petiolate, cell d almost as long as cell m1 (Fig. 45 ). Halter with stem brown; knob yellowish brown.

Abdomen (Fig. 43 ). Mainly yellow. Abdominal tergites with three dark-brown longitudinal stripes. Abdomen with yellow hairs.

Hypopygium (Figs 46-51 ) yellow. Posterior extension of tergite 9 depressed, with two pairs of short projections. Posterior margin of sternite 8 depressed, medially with long hairs, produced ventrad into a small, pale, fleshy lobe (Figs 46 , 47 ). Sternite 9 with a brown, horn-like projection (Figs 47 , 50 ). Outer gonostylus greatly produced and slender (Figs 48 , 51 ). Inner gonostylus with sharp beak, posterior crest produced backward; outer basal lobe with three strong, black setae (Fig. 49 ).

Distribution.

China (Sichuan, Xizang)

Remarks.

This species is similar to N. geniculata Yang & Yang, 1987 from China (Hubei, Inner Mongolia, Ningxia, Sichuan), but the latter differs in the following characters: without occipital marking; dorsal part of rostrum including nasus yellow. Posterior margin of sternite 8 undepressed, without fleshy lobe ventrally.

Figures

Figures 43 - 45. Nephrotoma nigrohalterata Edwards, 1928. 43 Male habitus, lateral view 44 head and thorax, dorsal view 45 wing. Scale bars: 1.0 mm.

Figures 46 - 51. Nephrotoma nigrohalterata Edwards, 1928. 46 Tergite 9, dorsal view, softened 47 hypopygium, ventral view 48 outer gonostylus, lateral external view, before softened 49 inner gonostylus, lateral external view 50 hypopygium, lateral view 51 outer gonostylus, lateral external view, softened. Scale bars: 0.5 mm (46, 47, 50); 0.1 mm (48, 49, 51).

Figures 60 - 62. Ecograph. 60 Nephrotoma beibengensis sp. nov. 61 Nephrotoma xizangensis Yang & Yang, 1987 (variation) 62 Nephrotoma nigrohalterata Edwards, 1928 (mating) (60, 61 by Zhenqi Song 62 by Qicheng Yang).