Blacus (Hysterobolus) baishanzuensis, 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 : 473-476

Blacus (Hysterobolus) baishanzuensis sp. nov.

( Figs. 1–2 )

Material examined. Holotype: ♀, China, Zhejiang, Qingyuan, Baishanzu , 18.VII.1994, Wu Hong, No. 946835 ( ZJUH).

Description. Female. Length of body 2.3 mm, length of fore wing 2.35 mm.

Body setosity. Body with dense pubescence, pubescence on propodeum denser than on remainder.

Head. Antennomeres 19; length of first flagellomere 1.6 × second flagellomere; length of first, second, penultimate and terminal flagellomere 4.75, 3.0, 1.3 and 2.2 × their width, respectively; length of maxillary palp 0.9 × height of head; OOL: diameter of posterior ocellus: POL = 11:3:5; frons smooth, with a very shallow longitudinal groove in upper half; eyes with short sparse setae; length of eye in dorsal view 1.0 × temple; occiput slightly concave; face transversely rugose; temple smooth; clypeus convex, slightly punctate, smooth; width of clypeus 3.0 × its medial height; tentorial pits large, distance between pits 2.3 × distance from pit to eye; malar suture absent, length of malar space 2.0 × basal width of mandible, mandible with setae.

Mesosoma. Length of mesosoma 1.4 × its height; side of pronotum smooth dorsally, remainder coarsely reticulate; precoxal sulcus wide, with some long striae, reaching the anterior edge of mesopleuron; notauli complete, wide and crenulate; mesoscutal lobes rather convex; scutellar sulcus with distinct median carina and four weakly developed carinae; scutellum convex, reticulate, its lateral carina lamelliform, distinctly protruding apically; propodeal tubercles small, the left acute apically, the right obtuse apically, lateral apical angle slightly less than 90°; surface of propodeum rugulose.

Wings. Fore wing: parastigma small; length of pterostigma 4.7 × its maximum width; length of vein r 1.3 × width of pterostigma; vein r arising slightly from apical of pterostigma; 1-CU1:2-CU1 = 11:15. Hind wing: 1r-m:1- M = 17:23; M+CU about subequal to 1-M; 2-1A present and short, branched posteriorly.

Legs. Hind coxa coarsely rugose dorsally, with distinct dorsal carina; length of femur, tibia and basitarsus of hind leg 5.0, 9.2 and 7.7 × their width, respectively; fore tarsal claws with brownish bristles.

Metasoma. Length of first tergite 1.8 × its apical width, widened apically, longitudinally rugose, dorsal carinae distinct in basal 0.5; remainder of tergites smooth; length of ovipositor sheath 0.18 × length of fore wing.

Colour. Brown; scape, head (dorsal and frontal) dark brown, palpi, labrum, mandible, tegulae, all legs (except hind coxa and tibia, all basitarsi) yellow; flagellomeres dark brown, but medial flagellomeres yellow; parastigma and base of pterostigma white; side of pronotum and mesopleuron reddish-brown; mesoscutum yellowish-brown; propodeum and first metasomal tergite black; remainder of metasoma, ovipositor and sheath, veins and pterostigma brown; hind tibia apically dark brown; all basitarsi dark brown; wing membrane slightly infuscate.

Male. Unknown.

Biology. Unknown.

Distribution. China (Zhejiang).

Etymology. The specific name refers to the name of the collection site.

Notes. The new species is similar to B. (H.) robustus Haeselbarth, 1973 because the scutellum is coarsely rugose, the malar suture absent, length of eye in dorsal view as long as temple, length of the penultimate flagellomere 1.3 × its width, and the hind tibia darkened apically, but differs by having a more setose body (sparser setose in B. robustus ), the temples more narrowed behind eyes in dorsal view and also in anterior view, the notauli completely crenulate (at least partly simple), the fore claw with brownish bristles (blackish), length of the malar space 2.0 × basal width of mandible (1.7 ×), length of the first tergite 1.8 × its apical width (1.4–1.5 ×), and dorsal carinae of first tergite distinct in basal 0.5 (in basal 0.3).

Figures

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

FIGURE 2. Hysterobolus baishanzuensis sp. nov. A. head, dorsal aspect; B. head, anterior aspect; C. antenna; D. mesopleuron; E. mesosoma, dorsal aspect; F. wings; G. propodeum, dorsal aspect; H. metasomal tergite, dorsal aspect; I. hind leg; J. fore claw; K. ovipositor and ovipositor sheath; L. part of fore wing; M. part of hind wing.