Blacus ( Contochorus ) capillosus, Lu & Achterberg & Tang & Chen, 2023

Blacus ( Contochorus) capillosus sp. nov.

( Figs 1–2 View FIGURE 1 View FIGURE 2 )

Material examined. Holotype: ♀, China, Shaanxi, Qinling, Tiantai Mtn , 4.IX.1999, Chen Xuexin, No. 991398 ( ZJUH) . Paratype: 1♀, China, Shaanxi, Qinling, Tiantai Mtn , 3.IX.1999, He Junhua, No. 990176 ( ZJUH) .

Description. Female. Length of body 2.4 mm, length of fore wing 2.35 mm.

Body setosity. Body with dense setae, although sparser on mesopleuron.

Head. Width of head in dorsal view 1.4 × its length ( Fig. 2A View FIGURE 2 ); antennomeres 16 ( Fig. 2C View FIGURE 2 ); length of first flagellomere 1.3 × length of second flagellomere; length of first, second and penultimate flagellomeres 4.6, 4.2 and 1.6 × their width, respectively; length of maxillary palp 1.0 × height of head; OOL: diameter of posterior ocellus: POL = 22:9:11; eyes with short dense setae ( Fig. 2A View FIGURE 2 ); length of eye in dorsal view 0.85 × length of temple; occiput almost level ( Fig. 2A View FIGURE 2 ); face with dense setae; temple with dense setae; malar suture present, length of malar space 1.75 × basal width of mandible.

Mesosoma. Length of mesosoma 1.45 × its height; pronotal sides coarsely reticulate ventrally, dorsally smooth; area behind prepectal carina less conspicuously crenulate ( Fig. 2E View FIGURE 2 ); precoxal sulcus narrow, with a few very short crenulae ( Fig. 2E View FIGURE 2 ); notauli absent ( Fig. 2D View FIGURE 2 ), without transverse carinae anteriorly; scutellar sulcus with medio-longitudinal carina ( Fig. 2D View FIGURE 2 ); scutellum smooth, its lateral carina present, not protruding apically; surface of propodeum smooth between carinae, its medial area rectangular ( Fig. 2F View FIGURE 2 ).

Wings. Fore wing: first discal cell widely truncate anteriorly ( Fig. 2H View FIGURE 2 ); vein r 1.2 × longer than maximum width of pterostigma; 1-CU1:2-CU1 = 13:21 ( Fig. 2H View FIGURE 2 ).

Legs. Hind coxa smooth, but with a distinct carina dorsally ( Fig. 2F View FIGURE 2 ); length of femur, tibia and basitarsus of hind leg 6.2, 9.9 and 11.0 × their width, respectively; fore and mid claws with bristles ( Figs 2I, 2J View FIGURE 2 ).

Metasoma. Length of first tergite 2.6 × its apical width, almost parallel-sided, its surface rugulose, dorsal carinae complete ( Fig. 2F View FIGURE 2 ); second tergite rugose; length of ovipositor sheath 0.10 × as long as fore wing.

Colour. Body reddish-brown; palpi, mandible, tegulae, fore and middle legs, hind coxa and trochanter yellow; pterostigma, parastigma, veins, ovipositor, ovipositor sheath and all basitarsus brown; bristles of fore and mid claws blackish; wing membrane slightly infuscate.

Variation. Length of first tergite 2.4–2.6 × its apical width.

Male. Unknown.

Biology. Unknown.

Distribution. China ( Shaanxi).

Etymology. The specific name capillosus refers to the setose body and is derived from “ capillosus ” (Latin for hairy).

Notes. The new species is similar to B. ( C). turbidus Papp, 1985 . Both species have medial area of propodeum rectangular, first discal cell of fore wing widely truncate anteriorly, and area behind prepectal carina less conspicuously crenulate than B. ( C). mellitarsis and B. ( C). epomidus but B. ( C). capillosus differ by having 16 antennomeres of female ( 21–23 in B. ( C). turbidus ), lateral carina of scutellum not protruding apically (strongly protruding apically in B. ( C). turbidus ), mid claws of female with blackish bristles (only setose in B. ( C). turbidus ), length of eye of ♀ in dorsal view 0.85 × temple (1.3–1.6 × in B. ( C). turbidus ) and notauli absent (complete in B. ( C). turbidus ).