The genus Ismarus Haliday are rarely collected parasitoids in the small family Ismaridae. In this study, two new species are described from China's Yunnan Province: Ismarusrobustus Chen & Yan, sp. nov. and Ismarusunisulcus Chen & Yan, sp. nov. An updated key to the Chinese species of the genus is provided.
Keywords: Diaprioidea; hyperparasitoid; key; new species; taxonomy; wasp.
Cheng-Jin Yan, Yan-Qiong Peng, Hua-Yan Chen.