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

Blacus ( Blacus) rugifacialis sp. nov.

( Figs 25–26 View FIGURE 25 View FIGURE 26 )

Material examined. Holotype: ♀, China, Zhejiang, Anji, Longwang Mtn , 26.VI.1996, Hu Yilian, No. 963687 ( ZJUH).

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

Head. Antennomeres 17, slender ( Fig. 26D View FIGURE 26 ); length of first flagellomere 1.3 × length of second flagellomere; length of first, second and penultimate flagellomere 4.2, 3.2 and 1.6 × their width, respectively; maxillary palp incomplete; occipital carina complete ( Fig. 26A View FIGURE 26 ); frontal suture present; OOL: OD: POL = 13: 4: 6; length of eye in dorsal view 0.9 × length of temple; face distinctly rugose; malar suture absent, length of malar space 2.0 × basal width of mandible.

Mesosoma. Length of mesosoma 1.8 × its height; side of pronotum rugose ventrally, smooth dorsally ( Fig. 26F View FIGURE 26 ); precoxal sulcus complete, wide and reticulate-rugose ( Fig. 26F View FIGURE 26 ); notauli complete, wide and distinctly crenulate ( Fig. 26D View FIGURE 26 ); mesoscutal middle lobe sparsely pubescence, lateral lobes glabrous ( Fig. 26D View FIGURE 26 ); scutellum rugose, its lateral carina complete, slightly protruding apically; propodeal tubercles absent; surface of propodeum reticulate-rugose, medial area present ( Fig. 26H View FIGURE 26 ).

Wings. Fore wing: parastigma distinctly differentiated from vein C+SC+R, first discal cell acute anteriorly; vein 3-SR+SR1 of fore wing straight; vein CUla of fore wing distinctly bent basally, distinctly below level of vein 2-CU1; 1-CU1: 2-CU1 = 1: 4; vein 2-M present and long ( Fig. 26E View FIGURE 26 ).

Legs. Hind coxa rugose dorsally; length of femur, tibia and basitarsus of hind leg 5.5, 10.75 and 9.7 × their width, respectively.

Metasoma. Length of first tergite 1.7 × its apical width, slightly widened apically, reticulate-rugose ( Fig. 26H View FIGURE 26 ); second tergite punctate basally, remainder of tergites slightly punctate ( Fig. 26H View FIGURE 26 ); length of ovipositor sheath 1.5 × length of fore wing, 5.0 × length of hind femur, 3.5 × length of hind tibia ( Fig. 26I View FIGURE 26 ).

Colour. Black; half basal of antenna, mandible, clypeus, palpi and all legs yellow; propodeum and first metasomal tergite reddish-brown; remainder of metasoma, tegulae, apical half of antenna, pterostigma, parastigma, veins, ovipositor and sheath brown; wing membrane infuscated.

Male. Unknown.

Biology. Unknown.

Distribution. China ( Zhejiang).

Etymology. The specific name rugifacialis refers to the rugose face and is derived from “ ruga ” (Latin for wrinkle).

Notes. The new species is similar to B. ( B.) longicaudatus Tobias, 1976 because notauli are wide and distinctly crenulate, ovipositor sheath approx. as long as the body, parastigma distinctly differentiated from vein C+SC+R, vein CUla of fore wing distinctly bent basally, distinctly below level of vein, length of first metasomal tergite 1.7 × its apical width, and vein 3-SR+SR1 of fore wing straight, but differs by having scutellum rugose (mainly smooth in B. ( B.) longicaudatus ), vein 2-M of fore wing comparatively long (comparatively short), medial area of propodeum present (absent), first discal cell acute widely anteriorly (truncate), scutellar sulcus with about 4 carinae (about 7 carinae), antenna comparatively slender apically (less slender), length of ovipositor sheath 1.5 × length of fore wing (0.97 ×), and face distinctly rugose (superficially rugose).