Xyeloblacus

Huangfu, Wei-Guo, Chai, Hong-Fei & Chen, Xue-Xin, 2012, The discovery of the rare genus Xyeloblacus van Achterberg, 1997 (Hymenoptera: Braconidae, Blacinae) in China, with description of a new species, Zootaxa 3255, pp. 65-67 : 65

Key to species of genus Xyeloblacus van Achterberg, 1997

1. Area near base of mandible ivory or whitish; first subdiscal cell of fore wing closed apically or nearly so; antennae of Ƥ 17- segmented, rarely 16; third antennal segment of Ƥ 1.1 times fourth segment; Austria, Poland.......................................................................................... X. leucobasis van Achterberg and Altenhofer

- Area near base of mandible dark brown; first subdiscal cell of fore wing distinctly opened apically; third antennal segment of Ƥ as long as fourth segment............................................................................. 2

2. Antennae of Ƥ 15-segmented, length of penultimate segment 0.7 times its width, length of apical segment 4.0 times penultimate segment; vein CU1b of fore wing absent; length of ovipositor sheath 0.55 times fore wing; Japan....................................................................................... X. melanobasis van Achterberg

- Antennal of Ƥ 22-segmented, length of penultimate segment 1.1 times its width, length of apical segment 1.5 times penultimate segment; vein CU1b short; length of ovipositor sheath equal to fore wing; China....... X. longithecus sp. nov.