Indabracon semicircularis sp. nov.

Figs 7, 8

Type material.

Holotype. ♀, China, Yunnan Prov., Xishuangbanna Meng’a, 1050-1080m, 13.X.1958, Wang Shuyong, No. IOZ(E)1964518 (IZCAS).

Diagnosis.

This new species is very similar to I. bicolor Yang & Chen, 2006, but can be separated from the latter by the following characters: pterostigma largely yellow (apical half of pterostigma dark brown in I. bicolor); fore wing vein 1-SR+M strongly curved basally (at most weakly curved basally in I. bicolor); T1 black laterally (whitish yellow laterally in I. bicolor); T2 with sub-lateral areas (sub-lateral areas absent in I. bicolor); and ovipositor sheath 0.8 times as long as fore wing (0.6 times in I. bicolor).

Description.

Holotype, ♀, length of body 10.0 mm, of fore wing 8.8 mm, of ovipositor sheath 7.2 mm.

Head. Antenna with 54 segments; apical antennal segment acute, 2.1 times longer than its maximum width (Fig. 8l); third segment 1.2 and 1.3 times longer than fourth and fifth, respectively, the latter 1.1 times longer than wide; length of maxillary palp 0.8 times height of head; malar suture moderately developed, sculptured and with dense, short setae (Fig. 8i); clypeus height: inter-tentorial distance: tentorio-ocular distance = 5: 12: 10; clypeus with sparse, long setae; eye weakly emarginated (Fig. 8g); face punctate, and with dense. short setae (Fig. 8g); eye height: shortest distance between eyes: head width = 18: 18: 37; frons largely smooth except for a few weak punctures, with a strong median groove (Fig. 8h); vertex largely smooth except for some sparse punctures, and with some sparse short setae; POL: OD: OOL = 4: 5: 14; length of malar space 1.7 times basal width of mandible; length of eye 1.5 times temple in dorsal view; temples smooth, with some long setae, and rather weakly narrowed behind eyes (Fig. 8h).

Mesosoma. Length of mesosoma 1.7 times its height (Fig. 8c); anterior half of notauli impressed (Fig. 8d); mesoscutum smooth, with sparse long setae (Fig. 8d); scutellar sulcus moderately wide, deep, and with crenulae (Fig. 8d); scutellum distinctly convex, smooth, and with some short setae posteriorly; metanotum strongly convex medially, and with a short median carina anteriorly (Fig. 8d); propodeum largely smooth except for some crenulae posteriorly, and with sparse setae medially, and dense, long setae laterally (Fig. 8d).

Wings. Fore wing (Fig. 8a): SR1: 3-SR: r = 22: 16: 3; 1-SR+M distinctly bent after arising from 1-M, and 1.7 times longer than 1-M; 2-SR: 3-SR: r-m = 7: 16: 6; CU1b 0.7 times as long as 3-CU1; cu-a subinterstitial, and nearly straight basally. Hind wing (Fig. 8b): 1r-m more or less straight; SC+R1: 2-SC+R: 1r-m = 6: 2: 3.

Legs. Length of fore femur: tibia: tarsus = 19: 22: 28; length of hind femur: tibia: basitarsus = 30: 47: 17; length of femur, tibia and basitarsus of hind leg 3.7, 9.4 and 4.9 times their maximum width, respectively.

Metasoma. T1 as long as its apical width, median area convex and strongly coarsely rugose, with a few carinae, medio-longitudinal carina only present posteriorly, lateral areas relatively narrow and smooth (Fig. 8j); lateral grooves of T1 distinctly crenulate (Fig. 8j); T2 largely coarsely striate-rugose except for smooth medio-basal area (Fig. 8e); antero-lateral grooves of T2 wide but rather shallow, weakly crenulate (Fig. 8e); second suture deep and crenulate, wide and more or less straight medially, narrow laterally (Fig. 8e); T3-4 with antero-lateral grooves, and latero-posterior corner medium-size; T3-4 striate-rugose (T4 relatively weak so); T3-5 with crenulate transverse subposterior groove (Fig. 8e); T5-7 largely smooth, and with some long setae posteriorly; hypopygium acute apically, not reaching level of apex of metasoma; ovipositor sheath 0.8 times as long as fore wing.

Colour. Largely black (Fig. 7); head largely yellow, but antenna, eyes, stemmaticum and apex of mandible black (Fig. 8g, h); prothorax, notaulic area, median mesoscutal lobe posteriorly, tegulae, and scutellum yellow (Fig. 8c, d); fore (but claws black) and middle legs (but tarsi and claws blackish) yellow; T4-5 yellow, but T4 black medially (except for posterior margin) and T5 with a half-rounded black spot medio-basally (Fig. 8e); posterior margins of T6-7 pale yellow (Fig. 8e); wing membrane yellowish, pterostigma (except for apical dark brown spot) yellow, veins largely yellow, hind wing vein 2-M dark brown (Fig. 8a, b).

Biology.

Unknown.

Distribution.

China (Yunnan).

Etymology.

Named after the shape of the black spot on the T5: “semi” and “circularis” are Latin for “half” and “round”, respectively.