Diplonevra spinibotra sp. nov.

(Figs. 31, 32, 48, 64)

Male: Head. Frons dark brown, subshining, with 40–60 scattered hairs. Mean frontal width 0.46 of head width. First row of bristles slightly convex, antials further apart than either is from an anterolateral. Second row of bristles straight, pre-ocellar bristles farther apart than either is from a mediolateral. Postpedicel brown, spherical with pointed tip. Palpus yellow brown and 3 times as long as its breadth, with 4 bristles on ventral apex. Proboscis pale yellow. Thorax. Scutum and scutellum dark brown, Notopleuron with 3 bristles. Scutellum with 4 bristles. Legs dark brown. Front tibia lacking dorsal bristles and differentiated hairs; front tarsomere 5 widened. Mid tibia with 2 longitudinal hair palisades, anterodorsal one straight and extending to 1/4 (0.28) of tibia. Posterior face of hind trochanter with 4 bristles on ventral region. Posterior face of hind femur with a cluster of 12–15 bristles, and with a triangular process bearing 1–3 fine hairs apically. Hind tibia with 2 palisades, lacking anteroventral bristles and anterodorsal bristles. Wing 2.04 mm long. Costal index 0.48. Costal ratios 5.9: 1.3:1. Costal cilia 0.08 mm long. Vein M 1 curved. Axillary ridge with 4 axillary bristles. All veins brown and membrane yellowish brown. Haltere dark brown. Abdomen. Tergites dark brown Venter dark grey. Hypopygium dark brown. Left side of epandrium narrow with 14–16 long hairs. Right side of epandrium broad, with about 18–20 long hairs toward posterior margin. Hypandrium tomentose, without bristles. Circus pale yellow and stalk of circus yellow. Body length 2.4– 2.8 mm.

Female: unknown.

Distribution. China (Ningxia).

Etymology. The specific epithet refers to the arrangement of bristles of posterior face of hind femur.

Holotype: ♂, Ningxia, Liupan Mountain (49°41′N, 119°51′E), 25–Jun–2008, Lixin Su ; Paratypes: 10♂, Ningxia, Liupan Mountain (49°41′N, 119°51′E), 25–Jun–2008, Lixin Su.

Remarks. The species is similar to D. triangulata but it is different by more than 10 bristles on posterior face of hind femur and they are thinner than those on posterior face of hind trochanter.