Blacus (Hysterobolus) longiapicalis, 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 : 481-483

Blacus (Hysterobolus) longiapicalis sp. nov.

( Figs. 7–8 )

Material examined. Holotype: ♀, China, Liaoning, Laotudingzi National Nature Reserve (41º22′N, 124º57′E), 16-19.VII.2011, Chen Huayan, NO. 202027906 ( ZJUH).

Description. Female. Length of body 3.2 mm, length of fore wing 2.7 mm.

Body setosity. Body with dense setae, setae on head sparser than on mesosoma.

Head. Antennomeres 19; length of first flagellomere 1.6 × second flagellomere; length of first, second, penultimate and terminal flagellomere 4.8, 3.0, 1.2 and 3.0 × their width, respectively; length of maxillary palp 1.1 × height of head; OOL: diameter of posterior ocellus: POL = 12:4:7; frons smooth, with a deep longitudinal groove in upper half; stemmaticum with a distinct furrow from triangle centre to occipital carina; eyes with short sparse setae; length of eye in dorsal view 0.9 × temple; occiput concave; face transversely rugose; temple smooth; clypeus convex, slightly punctate, smooth; width of clypeus 2.3 × its medial height; tentorial pits large, distance between pits 2.4 × distance from pit to eye; malar suture absent, length of malar space 2.0 × basal width of mandible, mandible with long setae.

Mesosoma. Length of mesosoma 1.5 × its height; side of pronotum smooth dorsally, remainder coarsely reticulate; precoxal sulcus wide, with some long striae, reaching anterior edge of mesopleuron; notauli complete, wide and crenulate; mesoscutal lobes rather convex, densely pubescence; scutellar sulcus with distinct median carina and two weakly developed carinae; scutellum reticulate, its lateral carina lamelliform; propodeal tubercles large ( Fig. 8H and 8K ), obtuse apically, lateral apical angle slightly less than 90°; surface of propodeum rugulose.

Wings. Fore wing: parastigma small; length of pterostigma 3.5 × its maximum width; length of vein r 1.1 × width of pterostigma; vein r arising slightly from apical of pterostigma; 1-CU1:2-CU1 = 14:17. Hind wing: 1r-m:1- M = 9:17; 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, 11.25 and 8.75 × their width, respectively; fore tarsal claws with blackish bristles.

Metasoma. Length of first tergite 1.5 × its apical width, widened apically, longitudinally rugose, dorsal carinae distinct in basal 0.5; remainder of tergites smooth; length of ovipositor sheath 0.16 × length of fore wing.

Colour. Black; head (dorsal and frontal) black, palpi, labrum, tegulae, fore and middle legs yellow; scape, clypeus reddish-brown; several basal flagellomeres yellowish-brown, gradually lighten towards apex, but several apical flagellomeres dark brown; mandible yellow, apex reddish-brown; parastigma and base of pterostigma white; side of pronotum reddish-brown, remainder black; edges of mesoscutum reddish-brown, remainder of mesoscutum and scutellum black; mesopleuron, propodeum and first metasomal tergite black; second tergite and sternum yellow, remainder of metasomal tergites and sternum, ovipositor and sheath, veins and pterostigma brown; hind leg yellowish-brown; all basitarsi apically brown; wing membrane slightly infuscate.

Male. Unknown.

Biology. Unknown.

Distribution. China (Liaoning).

Etymology. The specific name refers to the long apical flagellomere is derived from “ longus ” (Latin for long) and “ apex ” (Latin for top).

Notes. The new species is similar to B. (H.) robustus Haeselbarth, 1973 because the scutellum is coarsely rugose, the malar suture absent, the propodeal tubercle rather large, length of eye in dorsal view 0.9 × temple, and fore claw with blackish bristles, but differs by having malar space 2.0 × longer than basal width of mandible (1.7 × in B. robustus ), length of first and second flagellomeres 4.8 and 3.0 × their width, respectively (4.1 and 2.6 ×), dorsal carinae of first tergite distinct in basal 0.5 (in basal 0.3), and hind leg yellowish-brown (femur, tibia and tarsus of hind leg darkened apically, base of hind tibia yellowish).

Figures

FIGURE 7. Hysterobolus longiapicalis sp. nov. (body, lateral aspect). Scale bar: 1 mm

FIGURE 8. Hysterobolus longiapicalis sp. nov. A. head, dorsal aspect; B. head, anterior aspect; C. mesosoma, dorsal aspect; D. antenna; E. metasoma, dorsal aspect; F. mesopleuron; G. fore claw; H. propodeum, lateral aspect; I. hind leg; J. wings; K. propodeum, dorsal aspect; L. ovipositor and ovipositor sheath.