Monilobracon marginatus sp. nov. Figures 25, 26

Material examined.

Holotype: ♀, China, Yunnan Prov., Xishuangbanna, Xiaomengyang, 850 m, 23.VI.1957, Zang Lingchao, No. IOZ(E)1964556 (IZCAS).

Diagnosis.

This new species is very similar to Monilobracon longitudinalis sp. nov., but can be separated from the latter by the following characters: stemmaticum blackish brown (yellow in M. longitudinalis); fore wing without a stigmal spot (with a blackish brown stigmal spot); medio-basal area of T II relatively large and without sub-lateral areas (medio-basal are relatively small, and with large sublateral areas); basal half of T IV with striae (smooth); metasomal tergites blackish brown, but posterior margins of T III-VII whitish yellow (metasomal tergites blackish brown, but sublateral areas of T II partly yellowish); ovipositor sheath 2.0 × longer than fore wing (1.1-1.3 ×).

Description.

Holotype, ♀, length of body 13.6 mm, of fore wing 12.7 mm, of ovipositor sheath 25.0 mm.

Head. Antenna incomplete, with 19 antennomeres remaining; median antennomeres as long as wide; third antennomere 1.2 and 1.3 × longer than fourth and fifth, respectively, the latter 1.2 × longer than wide; maxillary palp incomplete; malar suture with sparse short setae, and finely sculptured (Fig. 26i); clypeus height: inter-tentorial distance: tentorio-ocular distance = 7: 9: 8; clypeus with sparse short setae; eye weakly emarginate (Fig. 26g); face coarsely sculptured (Fig. 26g); eye height: shortest distance between eyes: head width = 19: 25: 48; frons largely smooth, strongly concave behind antennal sockets, with a distinct median groove (Fig. 26h); vertex largely smooth except for a few weak punctures, with some sparse short setae; minimum distance between posterior ocelli: minimum diameter of elliptical posterior ocellus: minimum distance between posterior ocellus and eye = 5: 7: 16; length of malar space equal to basal width of mandible; temples largely glabrous except for a few short setae, and weakly narrowed behind eyes (Fig. 28h); in dorsal view length of eye 1.5 × temple.

Mesosoma. Length of mesosoma 1.5 × its height (Fig. 26c); notauli impressed in anterior half of mesoscutum, shallow posteriorly (Fig. 26d); mesoscutum smooth, with sparse short setae (Fig. 26d); scutellar sulcus rather wide, moderately deep, and with crenulae (Fig. 26d); scutellum with dense short setae posteriorly; metanotum strongly convex medially (Fig. 26d); propodeum smooth, with short medio-longitudinal groove anteriorly, and with few short crenulae posteriorly, with sparse setae medially, and with dense long setae laterally (Fig. 26d).

Wings. Fore wing (Fig. 26a): SR1: 3-SR: r = 36: 26: 7; 1-SR+M weakly and evenly curved, and 1.6 × longer than 1-M; 2-SR: 3-SR: r-m = 11: 26: 7; m-cu straight, and 2.0 × longer than 2-SR+M; cu-a interstitial. Hind wing (Fig. 26b): 1r-m longitudinal; SC+R1: 2-SC+R: 1r-m = 20: 4: 19.

Legs. Length of fore femur: tibia: tarsus = 29: 32: 46; length of hind femur: tibia: basitarsus = 40: 56: 17; length of femur, tibia and basitarsus of hind leg 5.3, 11.2 and 5.7 × their maximum width, respectively (Fig. 26f).

Metasoma. Length of T I 1.2 × its apical width, median area convex and strongly longitudinally rugose, with a medio-longitudinal carina (Fig. 26j); lateral grooves of T I crenulate (Fig. 26j); T II longitudinally rugose including medio-basal area, but smooth posterior-laterally (Fig. 26e); triangular medio-basal area of T II very large, attached with medio-longitudinal carina apically absent near posterior margin of T II; antero-lateral areas of T II absent, anterior grooves moderately impressed and crenulate (Fig. 26e); second suture deep and crenulate, wide and curved medially, narrow laterally (Fig. 26e); T III largely longitudinally rugose except for smooth posteriorly, antero-lateral areas weak and smooth posteriorly; T IV longitudinally rugose medio-anteriorly, and with weak antero-lateral areas; T V-VII smooth and antero-lateral areas absent (Fig. 26e); hypopygium acute apically, reaching level of apex of metasoma; ovipositor sheath 2.0 × as long as fore wing.

Colour. Head and mesosoma largely yellow (Fig. 25); antenna, eye, stemmaticum and mandible apically, black (Fig. 28g, h); fore and middle legs (but tarsus apically and claws black) yellow, hind leg black (coxa infuscate basally) (Fig. 26f); metasoma largely black, posterior margins of T III-VII whitish yellow (Fig. 26e); ovipositor sheath black (Fig. 25); wing membrane yellow, but grey brown apically and hind wing also medio-posteriorly), pterostigma (but apically blackish brown) and veins yellow (Fig. 26a, b).

Biology.

Unknown.

Distribution.

China (Yunnan).

Etymology.

Named after the whitish yellow posterior margins of the T III-VII: marginatus is Latin for margin.