Five species of Muscidifurax Girault & Sanders (Hymenoptera: Pteromalidae) are studied from mainland China, of which three new species, M.similadanacus Xiao & Zhou, sp. n., M.sinesensilla Xiao & Zhou, sp. n., M.neoraptorellus Xiao & Zhou, sp. n., and one newly recorded species, M.adanacus Doganlar, are reported. All species have been reared from pupae of Muscadomestica Linnaeus. A key to Chinese Muscidifurax and illustrations of external features of the species are provided.
Keywords: Muscidifurax; Pteromalidae; China mainland; key; new species; taxonomy.