Characteristics of the genus Psyllaephagus Ashmead, 1900 with description of a new species from Moscow Province (Hymenoptera, Chalcidoidea: Encyrtidae)

The publication contains many-sided characteristics of the genus Psyllaephagus and a description of P. vereshchagini sp. n. from Moscow Province, Russia. The new species is not related to species of this genus known from the forest zone of the European part of Russia, but is similar to P. nartshukae Trjapitzin, 1986 from Kirghizia. The female of P. vereshchagini differs from that of P. nartshukae in the uniform sculpture of the mesoscutum and scutellum; the marginal vein of the forewing of P. vereshchagini is nearly punctiform, while in P. nartshukae, it is twice as long as wide. The importance of two Australian species of Psyllaephagus for biological control of Psylloidea on eucalypti is emphasized.