Diplonevra pachycera (Schimitz)

(Figs. 19, 20, 42, 58)

Dohrniphora concinna var. pachycera Schmitz, 1918: 110 (♂). Dohrniphora pachycera: Schmitz, 1920: 99 .

Diploneura pachycera: Schmitz, 1927b: 71 .

Male: Head. Frons brown, subshining, with 100–120 scattered hairs. Mean frontal width 0.57 of head width. First row of bristles slightly convex, antials further apart than either is from an antrolateral. Second row of bristles slightly concave, all four bristles are equidistant. Supra-antennal bristles well below antials and close each other. Postpedicel dark brown, spherical with pointed tip. Palpus brown and 3 times as long as its breadth, with 4–5 bristles on ventral apex. Proboscis pale yellow. Thorax. Scutum and scutellum dark brown, Notopleuron with 3 bristles. Scutellum with 4 bristles. Legs brown. Front tibia with a dorsal bristle and 6–7 differentiated hairs. Mid tibia with 2 longitudinal hair palisades, anterodorsal one sharply deflected onto anterior face and extending to 2/3 (0.65) of tibia. Posterior face of hind trochanter with 6 stout and short bristles and several fine hairs. Ventral region of posterior face of hind femur with 4 bristles in a row, lacking ascending process. Hind tibia with 2 hair palisades, 1 anteroventral bristle, lacking anterodorsal bristles. Wing 1.66 mm long. Costal index 0.56. Costal ratios 4.1:1.1:1. Costal cilia 0.08 mm long. Vein M1 curved. Axillary ridge with 3 axillary bristles. All veins brown and membrane yellowish brown. Haltere brown. Abdomen. Tergites dark brown Venter dark grey. Hypopygium dark brown. Left side of epandrium narrow with 8–10 long hairs. Right side of epandrium broad, triangular, with about 10–12 long hairs toward posterior margin; ventral apex with an incurved hook. Hypandrium tomentose, without bristles. Circus dark brown and stalk of circus pale brown. Body length 1.6–2.3 mm.

Female. Head similar to male except as follows. Frons black, shinning. Postpedicel orange yellow. Proboscis pale yellow, elongate, extending beyond postpedicel. Wing 2.27 mm long. Costal index 0.5. Costal ratios 5.5: 1.5:1. Costal cilia 0.05 mm long. Body length 2.30 mm.

Distribution. China (Jilin, Liaoning); Russia, United Kingdom, Holland, Germany.

Specimens examined. 1♂, Jilin, Changbai Mountain (42°02′N, 127°46′E), 30–Jul–2008, Lixin Su ; 2♂, Jilin, Changbai Mountain (42°23′N, 129°41′E), 27–Jul–2003, Hong Fang ; 1♀, Jilin, Daxinggou (43°25′N, 129°40′E), 20–Jul–2005, Hong Fang ; 1♂, Liaoning, Laotie Mountain (38°45N, 121°11E), 11–Jun–2010, Jianfeng Wang.

Remarks. The species differs from its congeners by 4–5 bristles on posterior face of hind femur and absence of ascending process.