The genus Megastylus Schiødte (Hymenoptera, Ichneumonidae, Orthocentrinae) in China with a key to the species of China and Oriental Region

Three new species of Megastylus Schidte, 1838 (Ichneumonidae, Orthocentrinae), M. (Dicolus) mentouense Sheng Li, sp. nov. collected from Mentougou, Beijing, M. (D.) flavicornis Sheng Li, sp. nov. from Shennongjia National Natural Reserve, Hubei and M. (Megastylus) yindianense Sheng Li, sp. nov. from Minquan, Henan, are described and illustrated. A taxonomic key to the species of Megastylus known from China and the Oriental Region is provided.