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 ) rufiabdominus sp. nov. ( Figs 23–24 ) Material examined. Holotype : ♀ , China , Zhejiang , Deqing , Fatou , 27.V.1995 , He Junhua, No. 957342 ( ZJUH ). Description. Female. Length of body 2.2 mm , length of fore wing 1.8 mm . Head. Antennomeres 17, slender ( Fig. 24C ); length of first flagellomere 1.25 × length of second flagellomere; length of first, second and penultimate flagellomere 5.0, 4.0 and 1.7 × their width, respectively; maxillary palp approx. 1.0 × height of head; occipital carina complete ( Fig. 24A ); frontal suture absent; OOL: OD: POL = 8: 3: 5; length of eye in dorsal view 0.7 × length of temple; face smooth ( Fig. 24B ); malar suture absent, length of malar space 1.8 × basal width of mandible. Mesosoma. Length of mesosoma 1.8 × its height; side of pronotum rugose ventrally, smooth dorsally ( Fig. 24F ); precoxal sulcus complete, wide and reticulate-rugose ( Fig. 24F ); notauli complete and narrow, nearly smooth ( Fig. 24D ); mesoscutal lobes largely glabrous ( Fig. 24D ); scutellum largely smooth, its lateral carina complete, slightly protruding apically; propodeal tubercles absent; surface of propodeum reticulate-rugose, medial area absent ( Fig. 24E ). 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 = 3: 14; vein 2-M absent ( Fig. 24G ). Legs. Hind coxa slightly rugose; hind femur swollen apically, length of femur, tibia and basitarsus of hind leg 4.7, 12.25 and 10.0 × their width, respectively. Metasoma. Length of first tergite 2.1 × its apical width, nearly parallel-sided, reticulate-rugose ( Fig. 24E ); remainder of tergites smooth ( Fig. 24E ); length of ovipositor sheath 0.30 × length of fore wing, 1.3 × length of hind femur, 0.9 × length of hind tibia. Colour. Blackish; 4 basal antennomeres, palpi, tegulae, pterostigma, parastigma, veins and all legs yellow; pronotum, mandible, hind coxa and hind trochanter yellowish-red; basal half of metasoma reddish; ovipositor and sheath reddish-brown; wing membrane slightly infuscated. Male. Unknown. Biology. Unknown. FIGURE 23. Blacus rufiabdominus sp. nov. (body, lateral aspect). FIGURE 24. Blacus rufiabdominus sp. nov. A. head, dorsal aspect; B. head, anterior aspect; C. antenna; D. mesosoma, dorsal aspect; E. propodeum and metasoma, dorsal aspect; F. mesosoma, lateral aspect; G. wings; H. hind leg; I. ovipositor and ovipositor sheath. Distribution. China ( Zhejiang ). Etymology. The specific name rufiabdominus refers to the reddish metasoma and derived from “ rufus ” (Latin for red and reddish) 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 ovipositor sheath 0.30 × length of fore wing, and basal half of metasoma reddish, but differs by having narrow and nearly smooth notauli (wide and distinctly crenulate in B. ( B. ) inopinus ), length of first metasomal tergite 2.1 × its apical width (1.7 ×), posterior surface of propodeum less reticulate (more reticulate), antenna equally wide overall (narrowed medially and widened apically), and length of malar space 1.8 × basal width of mandible (1.2 ×). This new species is also similar to B. ( B. ) adustiabdominus sp. nov. , but differs by having more slender antenna (more robust in B. ( B. ) adustiabdominus ), frontal suture absent (present), vein 2-1A of fore wing long (short), length of first metasomal tergite 2.1 × its apical width (1.7 ×), basal half of metasoma reddish ventrally (yellow), hind coxa and hind trochanter yellowish-red (yellow), length of ovipositor sheath 0.30 × length of fore wing (0.21–0.22 ×).