Holotype, ♀ (ZUH), “S. China: Hunan, Shaoyang, nr Suining, Huangsang N. R., 12-13.VI.2009, 1000 m, Xi-Ying Li, RMNH’09”.

Hind femur slender (Fig. 190); third antennal segment of ♀ about 4.5 times as long as wide (Fig. 186); area between malar suture and clypeus without distinct punctures (Fig. 193); setose part of ovipositor sheath about 0.15 times as long as fore wing, half as long as hind tibia and 1.5 times as long as first tergite (Fig. 186); clypeus flattened; epistomal suture distinctly impressed; pronotum flattened and horizontal medio-anteriorly and with a minute round pronope (Fig. 194); mesopleuron largely chestnut-brown; first tergite comparatively slender (Fig. 189).

Holotype, ♀, length of body 1.7 mm, of fore wing 2.0 mm.

Head. Antenna with 27 segments and 1.2 times as long as fore wing; third segment 1.1 times as long as fourth segment, length of third, fourth and penultimate segments 4.5, 4.0 and 2.6 times their width, respectively (Fig. 191); length of maxillary palp 0.8 times height of head; labial palp segments petiolate, rather moniliform; occipital carina close to hypostomal carina (Fig. 193) and dorsally absent; hypostomal carina medium-sized (Fig. 193); length of eye in dorsal view 2.5 times temple; frons flattened and glabrous, smooth; face smooth, medially weakly elevated; width of clypeus 1.7 times its maximum height and 0.55 times width of face; clypeus flattened, smooth and its ventral margin thin and straight (Fig. 192); hypoclypeal depression slit-like, rather narrow (Fig. 192); malar suture present; without punctures between malar suture and clypeus; mandible gradually widened baso-ventrally, with medium-sized and weakly protruding ventral carina (Fig. 193).

Mesosoma. Length of mesosoma 1.4 times its height; dorsal pronope minute, round and pronotum horizontal anteriorly (Fig. 194); pronotal side smooth and posterior groove absent (Fig. 186); epicnemial area smooth dorsally; precoxal sulcus anteriorly and medially shallowly impressed, smooth as rest of mesopleuron (Fig. 186); pleural sulcus smooth; mesosternal sulcus very narrow and very finely crenulate; notauli absent on disc, only anteriorly with short smooth impressions (Fig. 188); mesoscutum glabrous and strongly shiny; medio-posterior depression of mesoscutum absent (Fig. 188); scutellar sulcus narrow and finely crenulate; scutellum smooth and slightly convex; surface of propodeum smooth, except for some short carinae posteriorly (Fig. 189).

Wings. Fore wing (Fig. 187): pterostigma long elliptical; 1-R1 reaching wing apex and 1.4 times as long as pterostigma; r:3-SR:SR1 = 3:23:53; 2-SR:3-SR:r-m = 14:23:6; r somewhat widened; 1-M straight and SR1 nearly so; m-cu slightly postfurcal; cu-a slightly postfurcal and 1-CU1 widened; first subdiscal cell narrowly open, CU1b obsolescent; M+CU1 nearly completely unsclerotized. Hind wing (Fig. 187): M+CU:1-M:1r-m = 5:5:2; cu-a straight; m-cu absent.

Legs. Length of femur, tibia and basitarsus of hind leg 4.5, 9.2 and 6.5 times as long as wide, respectively; hind femur and tibia with medium-sized setae (Fig. 190).

Metasoma. Length of first tergite 1.2 times its apical width, its surface distinctly convex medially and sparsely rugulose, largely smooth and dorsal carinae developed in basal half of tergite, straight (Fig. 189); second suture absent; second and following tergites smooth; length of setose part of ovipositor sheath 0.15 times fore wing, 1.5 times first tergite and 0.5 times hind tibia (Figs 186, 195).

Colour. Dark brown; scapus and pedicellus ventrally yellowish; palpi pale yellowish; clypeus mandible, humeral plate and legs (but hind tibia apically and hind tarsus and telotarsi slightly darkened) brownish-yellow; propleuron, propodeum, metasoma (except first tergite) and metasoma baso-ventrally yellowish-brown; pterostigma and veins mainly brown; wing membrane subhyaline.

Molecular data. None.

*China (Hunan).

Unknown.

Named in honour of Prof. Dr Ai-Ping Zeng, for his encouragement of and help to the first two authors.

The new species runs in the key by Chen and Weng (2005) to Opius clusilis Weng & Chen, 2005. Opius zengi differs by having the head roundly narrowed behind the eyes in dorsal view (directly narrowed in Opius clusilis), the setose part of the ovipositor sheath 1.5 times as long as the first tergite (0.6 times), length of the first tergite 1.2 times its apical width (1.4 times) and length of the third antennal segment 4.5 times its width (2.6 times).