Blacus (Ganychorus) tricolor, Lu & Chai & Achterberg & Tang & Chen, 2025

Blacus (Ganychorus) tricolor sp. nov.

( Figs 39–40 View FIGURE 39 View FIGURE 40 )

Material examined. Holotype: ♀, China, Yunnan, Bazhai, Yudongmen , near reservoir, 2017, No. 202021665 ( ZJUH) . Paratypes: 1♀, China, Zhejiang, Lishui, Jingning, Wangyangdong , 8.VIII.2016, Tian Hongwei, No. 201601781 ; 1♀, China, Yunnan, Bazhai, Yudongmen , near reservoir, 2017, No. 202021545 ( ZJUH) .

Diagnosis. The new species is similar to B. (G.) apaches van Achterberg, 1976 because the ♀ -antenna has 20 antennomeres, frons sparsely setose, lateral carina of scutellum distinctly protruding posteriorly, length of third antennomere 1.2–1.3 × fourth antennomere, first discal cell of fore wing truncate anteriorly, middle claws with blackish bristles, notauli only crenulate anteriorly, propodeal tubercles absent, and propodeum without areola, but differs by having propodeum between carinae partly rugose (smooth in B. (G.) apaches ), notauli rugose posteriorly (smooth posteriorly), length of penultimate antennal segment of 1.7–1.8 × its width (2.0 ×), length of first tergite 2.6–2.7 × its apical width (2.0–2.1 ×), most of mesopleuron with long rugulae (only precoxal sulcus with long rugulae), and length of malar space 2.0 × basal width of mandible (1.5 ×).

Description. Female. Length of body 2.2 mm, length of fore wing 2.15 mm.

Head. Antennomeres 20 ( Fig. 40C View FIGURE 40 ); length of first flagellomere 1.3 × length of second flagellomere; length of first, second and penultimate flagellomere 4.25, 3.7 and 2.0 × their width, respectively; length of maxillary palp 1.1 × height of head; occipital carina complete, narrowly crenulate; frons smooth and sparsely setose, frontal suture present; OOL: OD: POL = 9: 3: 4; length of eye in dorsal view 1.1 × length of temple; face with weak transverse rugae; malar suture present, length of malar space 2.0 × basal width of mandible.

Mesosoma. Length of mesosoma 1.5 × its height; side of pronotum smooth dorsally, rugose ventrally; mesopleuron with long rugae ( Fig. 40D View FIGURE 40 ); precoxal sulcus wide and striate-rugose; notauli narrow, crenulate anteriorly and rugose posteriorly ( Fig. 40E View FIGURE 40 ); mesoscutal middle lobe and notauli setose; scutellum largely smooth, with short rugae near lateral carinae, strongly protruding dorsally; propodeal tubercles absent; surface of propodeum rugose, medial area absent ( Fig. 40F View FIGURE 40 ).

Wings. Fore wing: first discal cell widely truncate anteriorly; 1-CU1: 2-CU1 = 4: 9 ( Fig. 40H View FIGURE 40 ).

Legs. Hind coxa with several carinae dorsally; length of femur, tibia and basitarsus of hind leg 6.75, 11.0 and 9.0 × their width, respectively; fore and middle claws with blackish bristles, hind claws simple.

Metasoma. Length of first tergite 2.6 × its apical width, rugose, slightly widened apically, nearly parallel-sided ( Fig. 40F View FIGURE 40 ); base of second tergite with very weak and short sculpture laterally ( Fig. 40G View FIGURE 40 ); length of ovipositor sheath 0.22 × length of fore wing.

Colour. Brown; several subapical antennomeres, palpi, parastigma, base of pterostigma and basal half of metasoma ventrally pale yellow; apical antennomere and scape brown; remainder of antennomeres and hind leg dark yellow; face and mesonotum yellowish brown; tegulae, fore and middle legs (but all telotarsi brown) yellow; colour of vein 3-SR+SR1 of fore wing and veins M+CU and 1-1A of hind wing paler than other veins; wing membrane hyaline.

Variation. Length of first tergite 2.6–2.7 × its apical width.

Male. Unknown.

Biology. Unknown.

Distribution. China (Zhejiang, Yunnan).

Etymology. The specific name tricolor refers to the tricoloured antenna.