Blacus ( Blacus ) hebeiensis, Lu & Chai & Achterberg & Tang & Chen, 2024

Blacus ( Blacus) hebeiensis sp. nov.

( Figs 9–10 View FIGURE 9 View FIGURE 10 )

Material examined. Holotype: ♀, China, Hebei, Xiaowutai Mtn, Dongling Mtn , alt. 2100m, 21.VIII.2005, Shi Min, No. 200607915 ( ZJUH)

Description. Female. Length of body 3.0 mm, length of fore wing 2.5 mm.

Head. Antennomeres 17, third–ninth antennomeres widened apically, tenth-sixth antennomeres not widened apically and moniliform ( Fig. 10C View FIGURE 10 ); length of first flagellomere 1.4 × length of second flagellomere; length of first, second and penultimate flagellomere 2.75, 2.0 and 1.3 × their width, respectively; length of maxillary palp 0.7 × height of head; occipital carina complete ( Fig. 10A View FIGURE 10 ); frontal suture absent; OOL: OD: POL = 9: 4: 5; length of eye in dorsal view 0.9 × length of temple; face rugose; malar suture present, length of malar space 1.6 × basal width of mandible.

Mesosoma. Length of mesosoma 1.5 × its height; side of pronotum reticulate-rugose ( Fig. 10E View FIGURE 10 ); precoxal sulcus wide and reticulate-rugose ( Fig. 10E View FIGURE 10 ); notauli complete, wide and rugose ( Fig. 10D View FIGURE 10 ); mesoscutal lobes densely setose ( Fig. 10D View FIGURE 10 ); scutellum smooth, its lateral carina complete, not protruding apically; propodeal tubercles small, indistinct; surface of propodeum reticulate-rugose, medial area distinct ( Fig. 10F View FIGURE 10 ).

Wings. Fore wing: parastigma distinctly differentiated from vein C+SC+R, first discal cell widely truncate anteriorly; vein 3-SR+SR1 of fore wing distinctly curved; vein CUla of fore wing distinctly bent basally, distinctly below level of vein 2-CU1; 1-CU1: 2-CU1 = 1: 1; vein 2-M present ( Fig. 10I View FIGURE 10 ).

Legs. Hind coxa rugose; length of femur, tibia and basitarsus of hind leg 5.4, 9.6 and 9.3 × their width, respectively.

Metasoma. Length of first tergite 1.5 × its apical width, widened apically, rugose ( Fig. 10G View FIGURE 10 ); remainder of tergites smooth ( Fig. 10G View FIGURE 10 ); length of ovipositor sheath 0.24 × length of fore wing, 1.0 × length of hind femur, 0.7 × length of hind tibia.

Colour. Black; mandible and tegulae dark yellow; palpi and all legs yellow; clypeus and hind coxae blackishbrown; metasoma (first tergite black), pterostigma, parastigma, veins, ovipositor and sheath brown; wing membrane subhyaline.

Male. Unknown.

Biology. Unknown.

Distribution. China ( Hebei).

Etymology. The specific name hebeiensis refers to the collection site of holotype, Hebei Province.

Notes. The new species is similar to B. ( B.) imitator Papp, 1985 because antenna is slender and unicoloured, hind femur slender, parastigma distinctly differentiated from vein C+SC+R, first discal cell widely truncate anteriorly, vein CUla of fore wing distinctly bent basally, distinctly below level of vein 2-CU1, and propodeal tubercle minute, but differs by having vein 2-M of fore wing present (absent in B. ( B.) imitator ), vein 3-SR+SR1 of fore wing distinctly curved (straight), 1-CU1: 2-CU1 = 1: 1 (1-CU1 distinctly shorter than 2-CU1), antennomeres not widened apically and moniliform (widened apically), length of first metasomal tergite 1.3–1.5 × its apical width (1.9 ×), length of ovipositor sheath 0.20–0.24 × length of fore wing (approx. 0.43 ×) and 0.7 × shorter than length of hind tibia (about 1.2 × longer than hind tibia).