Chelonus (Microchelonus) adiazetos sp. nov.

Figs 5–6

Material examined. Holotype: female, Tianmu Mt., Zhejiang Prov., China, 29.VII.1984, Xiaojin Wu, No. 844305 (ZJUH) . Paratype: 1 female, Tianmu Mt., Zhejiang Prov., China, 18.VIII.1999, Xiaojin Wu, No. 997801 .

Diagnosis. This new species is similar to C. (M.) indericus (Tobias, 2003), both having the metasomal carapace widest at middle and with the same length: width ratio, body black and most of legs yellowish brown, but the two species can be separated by the following characters: apex of metasomal carapace distinctly incurved (Fig. 6D) (versus slightly incurved in C. (M.) indericus); hind femur 2.7 × longer than wide (versus 1.7 ×); length of 3 rd antennomere 2.2 × longer than wide (Fig. 6H) (versus 3.0 ×).

Description. Holotype, female, length of body 3.1 mm, of fore wing 2.4 mm.

Head. Head transverse, width of head 1.8 × its dorsal length, occiput hardly excavated; antennomeres 16, antenna filiform, slightly widened after middle, length of 3 rd and penultimate antennomeres 2.2 × and 1.5 × their width, respectively (Fig. 6H); eye in dorsal view 2.1 × longer than temple; OOL: OD: POL=17: 6: 13; temple narrowed behind eyes; frons and vertex very coarsely transverse-rugose (Fig. 6G); face flat, concentric reticulate-rugose, width of face 1.9 × its height; eyes about parallel; clypeus densely punctate, interspaces shiny, clypeus 2.1 × wider than high, apical margin truncate medially, shiny; distance between tentorial pits 1.7 × distance between pits and eyes (Fig. 6F).

Mesosoma. Length of mesosoma 1.4 × its height; side of pronotum finely punctate, mesopleuron reticulate-rugose (Fig. 6B); notauli slightly impressed, mesoscutum uniformly and entirely coarsely reticulate-rugose; scutellum evenly convex, rugose; scutellar suture comparatively deep, narrow, with carinae; propodeum coarsely rugose, tubercles small and weak (Fig. 6C).

Wings. Vein r slightly arched; marginal cell 0.9 × as long as pterostigma; pterostigma 3.4 × longer than wide; r: 3-SR: SR1=12: 14: 51; SR1 slightly sinuate; marginal cell 2.7 × longer than second submarginal cell; 1-CU1: 2- CU1=13: 24; 2-R1 absent (Fig. 6A).

Legs. Hind coxa mainly smooth, shiny and setose; length of hind femur, tibia and basitarsus 2.7 ×, 3.9 × and 3.6 × their maximum width, respectively; length of inner hind tibial spur 0.5 × hind basitarsus.

Metasoma. Length of carapace 1.7 × its maximum width in dorsal view, widest at middle, apically rounded; carapace irregularly reticulate-rugose up to middle, rugose apically (Fig. 6E); length of carapace in lateral view 2.7 × its height, posterior height of metasoma 1.5 × its anterior height (Fig. 6D); carapace apically distinctly incurved.

Colour. Black; antenna brown but scapus yellowish; mandibles light brown but tip darkened; palpi light brown; pterostigma brown; middle of wing and its veins dark brown, wing base and its veins light brown; legs almost entirely yellow but hind coxa, femur and apex of tibia black; basal 1/3 of carapace with yellowish regular-edged band.

Male. Unknown.

Biology. Unknown.

Distribution. China (Zhejiang).

Etymology. Named “ adiazetos ” (Greek for unpolished) because the frons and vertex are very coarsely transverse-rugose.