Indabracon albogilvus sp. nov.

Figs 1, 2

Type material.

Holotype. ♀, China, Yunnan Prov., Xishuangbanna Meng’a, 1050-1080m, 17.X.1958, Chen Zhizi, No. IOZ(E)1964562 (IZCAS). Paratypes: 1♀, China, Yunnan Prov., Xishuangbanna Yunjinghong, 900m, 28.VI.1958, Zhang Yiran, No. IOZ(E)1964578 (IZCAS). 1♀, China, Yunnan Prov., Xishuangbanna Damenglong, 650m, 10.IV.1958, Hong Chunpei, No. IOZ(E)1964560 (IZCAS).

Diagnosis.

This new species is very similar to I. trimaculatus (Cameron, 1900), but can be separated from the latter by the following characters: scutellum black (pale yellowish brown in I. trimaculatus); fore wing vein cu-a curved basally, slightly postfurcal (straight and interstitial in I. trimaculatus); fore wing vein 1-SR+M strongly curved basally (more or less straight, or weakly curved in I. trimaculatus); smooth postero-lateral areas of T3 small (large in I. trimaculatus); ovipositor sheath 0.4-0.5 times as long as fore wing (about 0.8 times in I. trimaculatus).

Description.

Holotype, ♀, length of body 6.4 mm, of fore wing 6.6 mm, of ovipositor sheath 2.4 mm.

Head. Antenna with 42 segments; apical antennal segment strongly acute, 2.1 times longer than its maximum width (Fig. 2l); third segment 1.1 and 1.2 times longer than fourth and fifth, respectively, the latter 1.3 times longer than wide; length of maxillary palp 0.8 times height of head; malar suture present, and with sparse, short setae (Fig. 2i); clypeus height: inter-tentorial distance: tentorio-ocular distance = 3: 5: 3; clypeus with sparse, long setae; eye hardly emarginated (Fig. 2g); face with some punctures, especially laterally (Fig. 2g); eye height: shortest distance between eyes: head width = 20: 18: 41; frons largely smooth except for a few weak punctures, with a strong narrow median groove (Fig. 2h); vertex largely smooth except for a few weak punctures, and with some sparse short setae; POL: OD: OOL = 4: 4: 11; length of malar space 1.6 times basal width of mandible; length of eye 2.4 times temple in dorsal view; temples largely glabrous except for a few short setae, and directly narrowed behind eyes (Fig. 2h).

Mesosoma. Length of mesosoma 1.8 times its height (Fig. 2c); notauli impressed anteriorly half (Fig. 2d); mesoscutum smooth, with sparse long setae (Fig. 2d); scutellar sulcus wide, deep, and with crenulae (Fig. 2d); scutellum distinctly convex, sparsely punctate, and with dense short setae posteriorly; metanotum strongly convex medially, and with a short median carina anteriorly (Fig. 2d); propodeum largely smooth except for some crenulae posteriorly, and with sparse setae medially, and dense, long setae laterally (Fig. 2d).

Wings. Fore wing (Fig. 2a): SR1: 3-SR: r = 12: 9: 2; 1-SR+M weakly curved after arising from 1-M, and 1.5 times longer than 1-M; 2-SR: 3-SR: r-m = 8: 18: 5; CU1b 0.8 times as long as 3-CU1; cu-a weakly postfurcal, and slightly bent basally towards base of wing. Hind wing (Fig. 2b): 1r-m more or less straight; SC+R1: 2-SC+R: 1r-m = 19: 5: 7.

Legs. Length of fore femur: tibia: tarsus = 18: 21: 25; length of hind femur: tibia: basitarsus = 25: 37: 12; length of femur, tibia and basitarsus of hind leg 3.8, 6.7 and 4.0 times their maximum width, respectively.

Metasoma. Length of T1 0.9 times its apical width, median area convex and striate-rugose, lateral areas largely smooth but anteriorly striate-rugose (Fig. 2j); lateral grooves of T1 sparsely and weakly crenulate anteriorly (Fig. 2j); T2 largely coarsely sculptured, but medio-basal area smooth (Fig. 2e); antero-lateral grooves of T2 developed and crenulate (Fig. 2e); second suture deep and crenulate, wide and straight medially, narrow laterally (Fig. 2e); T3-4 with antero-lateral grooves, and latero-posterior corner small; T3-5 coarsely sculptured, and with crenulate transverse subposterior groove (Fig. 2e); T6-7 largely smooth, and with spare long setae posteriorly; hypopygium acute apically, not reaching level of apex of metasoma; ovipositor sheath 0.4 times as long as fore wing.

Colour. Largely black (Fig. 1); head yellow, but antenna, eyes, and mandible apically black; prothorax, notaulic area, median mesoscutal lobe posteriorly and tegulae yellow (Fig. 2c, d, g, h); fore legs (except for first segment of tarsus posteriorly, second-fifth segment of tarsus, and claws black) yellow; T1 whitish yellow, T6-7 pale yellow posteriorly (Fig. 2e, j); wing membrane fuscate, pterostigma (except basal yellow patch) and veins dark brown (Fig. 2a, b).

Variation. Length of body of female 6.4-8.3 mm, of fore wing of female 6.5-7.6 mm, and of ovipositor sheath 2.4-3.1 mm; antenna of female with 40-44 segments; length of mesosoma 1.6-1.8 times its height; fore wing vein CU1b 0.6-0.8 times as long as vein 3-CU1; tegulae sometimes black, and pterostigma sometimes uniformly black.

Biology.

Unknown.

Distribution.

China (Yunnan).

Etymology.

Named after the whitish yellow colour of the T1: " Indabracon albogilvus " is Latin for "whitish yellow".