Blacus (Hysterobolus) yunnanensis, Lu & Achterberg & Tang & Chen, 2023

Lu, Qian-Yu, Achterberg, Cornelis Van, Tang, Pu & Chen, Xue-Xin, 2023, The discovery of the subgenus Hysterobolus Viereck, 1913 (Hymenoptera, Braconidae, Brachistinae, Blacini, Blacus) in China, with description of nine new species, Zootaxa 5293 (3), pp. 472-498 : 495-497

Blacus (Hysterobolus) yunnanensis sp. nov.

( Figs. 11–12 )

Material examined. Holotype: ♀, China, Yunnan, Ruili (24º1′N, 97º51′E), 29. IV.1981, He Junhua, NO. 812372 ( ZJUH).

Description. Female. Length of body 2.6 mm, length of fore wing 2.5 mm.

Body setosity. Body with long setae, mesopleuron and side of pronotum glabrous, propodeum denser setose than head and mesonotum.

Head. Antenna with at least 18 antennomeres (apex missing); length of first flagellomere 1.8 × second flagellomere; length of first and second flagellomere 4.9 and 2.7 × their width, respectively; length of maxillary palp 1.1 ×height of head; OOL:diameter of posterior ocellus:POL=20:8:11;frons with sparse setae and a deep longitudinal groove in upper second; eyes with short setose, sparse; length of eye in dorsal view 1.2 × temple; occiput slightly concave; face almost entirely smooth; temple smooth; clypeus convex, slightly punctate, smooth; width of clypeus 2.5 × its medial height; tentorial pits large, distance between pits 2.7 × distance from pit to eye; malar suture present, length of malar space 2.0 × basal width of mandible, mandible with long setae.

Mesosoma. Length of mesosoma 1.35 × its height; side of pronotum largely smooth dorsally; precoxal sulcus narrow, with a few short striae, far from the anterior edge of mesopleuron ( Fig. 18G ); notauli complete, wide and crenulate; mesoscutal lobes rather convex, with long and soft pubescence; scutellar sulcus with median carina; scutellum (superficially) rugulose, its lateral carina lamelliform, distinctly protruding apically; propodeal tubercles small, acute apically, lateral apical angle slightly more than 90°; surface of propodeum rugulose.

Wings. Fore wing: parastigma small; length of pterostigma 3.75 × its maximum width; length of vein r 1.2 × width of pterostigma; vein r arising from apical of pterostigma; 1-CU1:2-CU1 = 12:13. Hind wing: 1r-m:1-M = 20:27; M+CU almost subequal to 1-M; 2-1A absent.

Legs. Hind coxa slightly rugose dorsally, with distinct dorsal carina; length of femur, tibia and basitarsus of hind leg 5.9, 11.5 and 7.1 × their width, respectively, fore tarsal claws with blackish bristles.

Metasoma. Length of first tergite 1.6 × its apical width, widened apically, longitudinally rugose, dorsal carinae distinct in basal 0.7; remainder of tergites smooth; length of ovipositor sheath 0.14 × length of fore wing.

Colour. Reddish-brown; dorsal head black; palpi, tegulae, parastigma, fore and middle legs yellow; medial flagellomeres lighter in colour; mandible yellow, apex red; veins, pterostigma, ovipositor sheath, and metasomal tergite (except first) brown; ovipositor, hind legs coxa, femur and telotarsus yellowish-brown, tibia brown; all apical basitarsus (basal yellow) and claws brown; wing membrane slightly infuscate.

Male. Unknown.

Biology. Unknown.

Distribution. China (Yunnan)

Etymology. The specific name refers to the locality of the holotype.

Notes. The new species is similar to B. (H.) nixoni Haeselbarth, 1973 because the malar suture is present, the scutellum (superficially) rugulose, the propodeal tubercle comparatively small, length of first tergite 1.6 × its apical width, flagellomeres long setose, and face almost entirely smooth, but differs by having the eighth flagellomere 2.2 × longer than wide (about 1.7 × in B. nixoni ), length of malar space of 2.0 × basal width of mandible (1.5 ×), dorsal carinae distinct in basal 0.7 (0.9 ×), precoxal sulcus with less striae (with more striae), and body reddish-brown (black).

Figures

FIGURE 11. Hysterobolus niger sp. nov. (body, lateral aspect). Scale bar: 1 mm

FIGURE 12. Hysterobolus niger sp. nov. A. head, dorsal aspect; B. head, anterior aspect; C. antenna; D. mesopleuron; E. mesosoma, dorsal aspect; F. propodeum and metasoma, dorsal aspect; G. propodeum, dorsal aspect; H. wings; I. fore claw; J. ovipositor and ovipositor sheath; K. hind leg.

FIGURE 18. Hysterobolus yunnanensis sp. nov. A. head, dorsal aspect; B. head, anterior aspect; C. antenna; D. mesosoma, dorsal aspect; E. propodeum and metasoma, dorsal aspect; F. wings; G. mesopleuron; H. hind leg; I. fore claw; J. ovipositor and ovipositor sheath.