Four new species and four newly recorded species of Omphale Haliday (Hymenoptera, Eulophidae) from China, with a key to Chinese species

In this paper, four species of Omphale Haliday, O.longigena Li & Li, sp. nov., O.longitarsus Li & Li, sp. nov., O.rectisulcus Li & Li, sp. nov., and O.xanthosoma Li & Li, sp. nov., are described as new to science; four species, O.brevibuccata Szelényi, O.connectens Graham, O.melina Yefremova & Kriskovich, and O.obscura (Förster) are reported from China for the first time; and the male of O.melina is reported for the first time in the world. A key to all known species of the genus Omphale in China is provided.