Blacus (Ganychorus) latiacis sp. nov.

(Figs 19–20)

Material examined. Holotype: ♀, China, Xizang, Yalu Tsangpo River, Grand Canyon, 12.VI.2009, Tan Jiangli, No. 200906264 (ZJUH) . Paratypes: 4♀♀, China, Yunnan, Bao Mtn, Lujiangba, Gaoligong Mtn Nature Park, 10– 11. V.2009, Zeng Jie, Nos. 200902968, 200902973; Wang Manman, No. 200903030; 11. V.2009, Wang Manman, No. 200904554 ; 1♀, China, Yunnan, Xianggelila, Hutiaoxia, 7. VI.2009, Tan Jiangli, No. 200906288; 2♀♀, China, Yunnan, Dali, Cang Mtn, 5. VI.2009, Tan Jiangli, Nos. 200906297, 200906300 (ZJUH) ; 1♀, China, Fujian, Chongan, Xingcun, Sangang–Jianyang, Aotou, alt. 740–1170m, 20. V.1960, Ma Chenglin, IOZ (E) 2059931 (IZCAS) .

Diagnosis. The new species is similar to B. (G.) hadrolophus van Achterberg, 1988 because the ♀ -antenna has 20 antennomeres, second tergite smooth, first discal cell of fore wing widely truncate anteriorly, frons sparsely setose, antenna slender submedially, propodeum without areola, fore claws with blackish bristles, hind claws simple, telotarsi brown, length of first metasomal tergite 2.1 × its apical width, and widened apically, but differs by having yellow legs (brown in B. (G.) hadrolophus), malar suture present (only near eye shallowly impressed), middle claws with blackish bristles (simple), hind basitarsus normal (robust compared with remainder of tarsus), and hind femur slender (robust).

Description. Female. Length of body 2.05 mm, length of fore wing 2.1 mm.

Head. Antennomeres 20, densely setose (Fig. 20C); length of first flagellomere 1.6 × length of second flagellomere; length of first, second and penultimate flagellomere 4.8, 3.0 and 1.4 × their width, respectively; length of maxillary palp equal to height of head; occipital carina complete; frons smooth and sparsely setose, frontal suture present; OOL: OD: POL = 16: 6: 9; length of eye in dorsal view equal to length of temple; face smooth; malar suture present, length of malar space 1.75 × basal width of mandible.

Mesosoma. Length of mesosoma 1.5 × its height; side of pronotum rugose ventrally and smooth dorsally; precoxal sulcus very wide, with long striae (Fig. 20D); notauli narrow and slightly rugose superficially (Fig. 20E); mesoscutal lobes glabrous; scutellum smooth, protruding dorsally; propodeal tubercles absent; surface of propodeum smooth between carinae, medial area absent (Fig. 20G).

Wings. Fore wing: first discal cell widely truncate anteriorly; 1-CU1: 2-CU1 = 7: 15 (Fig. 20F).

Legs. Hind coxa with two oblique carinae dorsally; length of femur, tibia and basitarsus of hind leg 6.3, 9.7 and 12.0 × their width, respectively; fore and middle claws with blackish bristles (Fig. 20I); hind claws simple.

Metasoma. Length of first tergite 2.1 × its apical width, widened apically, spaced rugose (Fig. 20G); second tergite smooth; length of ovipositor sheath 0.24 × length of fore wing.

Colour. Reddish brown; basal half of antenna, clypeus, mandible, palpi, tegulae and all legs (but telotarsi brown) yellow; apical half of antenna, metasoma (except first tergite), pterostigma, parastigma, veins, ovipositor and its sheath brown; wing membrane infuscated.

Variation. Several basal antennomeres or basal half of antenna yellow.

Male. Unknown.

Biology. Unknown.

Distribution. China (Fujian, Yunnan, Xizang).

Etymology. The specific name refers to the very wide precoxal sulcus and is derived from “ latus ” (Latin for wide) and “- acis ” (Latin for furrow).