Trachyusa vasilisk Belokobylskij, 1998

Zhu, Jiachen, Achterberg, Cornelis Van & Chen, Xuexin, 2025, A revision of five genera of Alysiini (Hymenoptera, Braconidae, Alysiinae) from China, with description of five new species, Zootaxa 5569 (3), pp. 401-438 : 419

Trachyusa vasilisk Belokobylskij, 1998

Figs 13–14

Trachyusa vasilisk Belokobylskij, 1998: 293 ; Yao et al. 2015: 581.

Material. 1♀ ( ZJUH), “ [SE. China:] Guizhou, Mt. Leigong , 1.vi.2005, Liu Jingxian, No. 200606658” ; 1♀ ( NWUX), NW China: Shaanxi, Qinling Mts, Taiping Nat. Park , 600–1500 m, 31.v.2015, 34°55’40”N 108°39’28”E, Jiangli Tan ; 1♀ 1♂ ( RMNH), NW China: Shaanxi, Qinling Mts, Luonan, Luoyuan , c. 1350 m, 28.v.2016, swept, N34°12’, E109°50’, Jiangli & Qingqing Tan ; 2♂ ( NWUX, RMNH), NW China: Shaanxi, Xunyangba, Ningshan , c. 1300 m, vii.2014 & 30.ix.2014, 33°33’N 108°32’N, Jiangli Tan ; 1♂ ( NWUX), NW China: Shaanxi, Liping Nat. Forest Park, along road between Hongchenxia-Sicheng , 32°47’N 106°40’E, c. 1490 m, 21.vi.2015, J-L. Tan ; 1♂ ( NWUX), NW China: Shaanxi, Huanghualing, Zhashui , 1408 m, yellow [Malaise] trap, 20.v.–1.vii.2016, N33.80°, E108.88°, J-L & Q-Q Tan .

Short redescription. Body dark brown ( Fig. 13 ); ♀, length of body 3.1 mm, of fore wing 3.3 mm; eye in lateral view 1.3 × higher than wide; frons flat and smooth; vertex rather convex; OOL:diameter of ocellus:POL= 7:4:5; face 1.3 × wider than high, rather evenly convex, with some long setae and punctures ( Fig. 14I ); clypeus semicircular and medium-sized, rather flat, with some punctures ( Fig. 14J ); length of malar space 0.35 × basal width of mandible; first and third teeth of mandible small, middle tooth wide and acute, distinctly longer than lateral teeth and with orthogonal protuberance on upper margin ( Figs 14L–M ); notauli only impressed anteriorly on disc, crenulated and narrow ( Fig. 14D ); medio-posterior depression of mesoscutum medium-sized to long; middle lobe of mesoscutum with medium-sized setae, lateral lobes largely glabrous ( Fig. 14D ); mesoscutum slender and 1.1 × longer than wide; surface of propodeum densely and coarsely reticulate-rugose, areola absent ( Fig. 14E ); pterostigma elliptical; vein r 0.6 × width of pterostigma; cu-a postfurcal ( Fig. 14A ); hind coxa smooth or rugulose ( Fig. 14D ); setose part of ovipositor sheath 0.05 × as long as fore wing (total 0.09 times), flattened and setose basally and 0.2 × as long as hind tibia ( Fig. 14G ).

Variation. Length of body 2.4–3.4 mm and of fore wing 2.6–3.3 mm; antenna of ♀ with 30(3) antennomeres; pterostigma of ♂ strongly enlarged and antenna with 28(1), 29(2), 30(1), 32(1) antennomeres.

Figures

FIGURE 13. Trachyusa vasilisk Belokobylskij, ♀, China, Guizhou. habitus, lateral aspect.

FIGURE 14. Trachyusa vasilisk Belokobylskij, ♀, China, Guizhou. A, fore wing; B, hind wing; C, mesosoma, lateral aspect; D, mesosoma, dorsal aspect; E, propodeum and metasoma, dorsal aspect; F, propodeum and first–third metasomal tergites, dorsal aspect; G, ovipositor sheath, lateral aspect; H, basal antennomeres of antenna, lateral aspect; I, head, dorsal aspect; J, head, anterior aspect; K, head, lateral aspect; L, mandible, full view on first and second teeth; M, mandible, full view on third tooth.