The first report of subgenus Blacus Nees, 1819 (Hymenoptera, Braconidae, Brachistinae) from China Author Lu, Qian-Yu 0000-0001-9551-2380 State Key Lab of Rice Biology, Zhejiang University, Hangzhou 310058, China. & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Zhejiang University, Hangzhou 310058, China. & Zhejiang Provincial Key Laboratory of Biology of Crop Pathogens and Insects, Zhejiang University, Hangzhou 310058, China. & Institute of Insect Sciences, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China. qylu@zju.edu.cn Author Chai, Hong-Fei 0009-0007-2672-7418 Institute of Insect Sciences, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China. zjuchai@163.com Author Achterberg, Cornelis Van 0000-0002-6495-4853 Institute of Insect Sciences, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China. kees@vanachterberg.org Author Tang, Pu 0000-0003-2296-9544 State Key Lab of Rice Biology, Zhejiang University, Hangzhou 310058, China. & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Zhejiang University, Hangzhou 310058, China. & Zhejiang Provincial Key Laboratory of Biology of Crop Pathogens and Insects, Zhejiang University, Hangzhou 310058, China. & Institute of Insect Sciences, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China. ptang@zju.edu.cn Author Chen, Xue-Xin 0000-0002-9109-8853 State Key Lab of Rice Biology, Zhejiang University, Hangzhou 310058, China. & Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Zhejiang University, Hangzhou 310058, China. & Zhejiang Provincial Key Laboratory of Biology of Crop Pathogens and Insects, Zhejiang University, Hangzhou 310058, China. & Institute of Insect Sciences, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China. xxchen@zju.edu.cn text Zootaxa 2024 2024-06-21 5471 5 501 535 http://dx.doi.org/10.11646/zootaxa.5471.5.1 journal article 298867 10.11646/zootaxa.5471.5.1 5485ca3b-9572-4bbf-a216-054cf1e0494b 1175-5326 12207563 3D7BA3AC-A3BE-4F89-9178-D200841F052F Blacus ( Blacus ) adustiabdominus sp. nov. ( Figs 1–2 ) Material examined. Holotype : ♀ , China , Fujian , Wuyi Mtn , Xingcun Town , 20.IV.2009 , Tan Jiangli, No. 201605131 ( ZJUH ) . Paratypes : 3♀♀ , China , Guangdong , Shixing , Chebaling , 19.IV.2002 , Xu Zaifu , Nos. 20050568, 20051005; 21.VIII.2003 , Xu Zaifu, No. 20052130 ( ZJUH ) . Description. Female. Length of body 1.9 mm , length of fore wing 2.0 mm. FIGURE 2. Blacus adustiabdominus sp. nov. A. head, dorsal aspect; B. head, anterior aspect; C. antenna; D. mesosoma, lateral aspect; E. mesosoma, dorsal aspect; F. propodeum, dorsal aspect; G. metasoma, dorsal aspect; H. hind leg, ovipositor and ovipositor sheath; I. fore wing. Head. Antennomeres 17, slender ( Fig. 2C ); length of first flagellomere 1.1 × length of second flagellomere; length of first, second and penultimate flagellomere 4.8, 4.0 and 1.6 × their width, respectively; maxillary palp 1.1 × height of head; occipital carina complete ( Fig. 2A ); frontal suture present; OOL: OD: POL = 7: 2: 5; length of eye in dorsal view 0.9 × length of temple; face smooth ( Fig. 2B ); malar suture absent, length of malar space 1.75 × basal width of mandible. Mesosoma. Length of mesosoma 1.5 × its height; side of pronotum rugose ventrally, smooth dorsally ( Fig. 2D ); precoxal sulcus complete, wide and reticulate-rugose ( Fig. 2D ); notauli complete and narrow, nearly smooth ( Fig. 2E ); mesoscutal lobes glabrous ( Fig. 2E ); scutellum largely smooth, its lateral carina complete, not protruding apically; propodeal tubercles absent; surface of propodeum reticulate-rugose, medial area absent ( Fig. 2F ). Wings. Fore wing: parastigma slightly differentiated from vein C+SC+R, first discal cell acute anteriorly; vein 3-SR+SR1 of fore wing nearly straight; vein CUla of fore wing nearly at same level as vein 2-CU1; 1-CU1: 2-CU1 = 1: 4; vein 2-M absent ( Fig. 2I ). Legs. Hind coxa slightly rugose; hind femur swollen apically, length of femur, tibia and basitarsus of hind leg 4.6, 12.5 and 9.5 × their width, respectively. Metasoma. Length of first tergite 1.7 × its apical width, widened apically, reticulate-rugose ( Fig. 2G ); remainder of tergites smooth ( Fig. 2G ); length of ovipositor sheath 0.21 × length of fore wing, 1.1 × length of hind femur, 0.7 × length of hind tibia. Colour. Dark reddish-brown; base of antenna, clypeus, mandible, palpi, tegulae, pterostigma, parastigma, veins and all legs yellow; side of pronotum, metasoma (except first tergite), ovipositor and sheath brown; wing membrane infuscated. Variation. Length of first metasomal tergite 1.7–1.8 × its apical width; length of fore wing 1.9–2.0 mm; length of ovipositor sheath 0.21–0.22 × length of fore wing; side of pronotum yellowish-brown to brown. Male. Unknown. Biology. Unknown. Distribution. China ( Fujian , Guangdong ). Etymology. The specific name adustiabdominus refers to the brown metasoma and is derived from “ adustus ” (Latin for brown) and “ abdomen ” (Latin for abdomen). Notes. The new species is similar to B. ( B. ) inopinus van Achterberg, 1976 because parastigma is small and narrow, slightly differentiated from vein C+SC+R, first discal cell of fore wing acute anteriorly, scutellum largely smooth, ovipositor sheath somewhat longer than hind femur, vein CUla of fore wing nearly at same level as vein 2-CU1, vein 2-M of fore wing absent, propodeal tubercle absent, length of first metasomal tergite 1.7 × its apical width, and malar space longer than basal width of mandible, but differs by having narrow and nearly smooth notauli (wide and distinctly crenulate in B. ( B. ) inopinus ), posterior surface of propodeum less reticulate (more reticulate), antenna equally wide overall (narrowed medially and widened apically), length of malar space 1.75 × basal width of mandible (1.2 ×), and length of ovipositor sheath 0.21–0.22 × length of fore wing (0.27 ×).