A Taxonomic Review of the Gall Wasp Genus Dalla-Torre and Kieffer and other Oak Cynipid Inquilines (Hymenoptera: Cynipidae) from Mainland China, with Updated Keys to Eastern Palaearctic and Oriental Species.

After the examination of the oak cynipid inquilines deposited in the Parasitic Hymenoptera Collection of the Agriculture and Forestry University of Zhejiang (ZAFU, China), we provide a revision of the species of , , (Hymenoptera: Cynipidae: Synergini) and (Hymenoptera: Cynipidae: Ceroptresini) found in mainland China. Two new species of are described: Lobato-Vila and Pujade-Villar, sp. nov. and Lobato-Vila and Pujade-Villar, sp. nov. Four species ( Melika and Schwéger, 2015, Schwéger and Tang, 2015, Melika and Schwéger, 2015, and Tang, Schwéger and Melika, 2015) are new records for this region. We also provide new data on the biology and distribution, redescriptions, illustrations and corrections to some of the species, as well as updated keys to Eastern Palaearctic and Oriental species of and . Three species of are considered to have an uncertain status: (Ashmead, 1885) from the USA, (Kieffer, 1904) from India, and Belizin, 1968 from China. The validity of in the Nearctic region as well as the current status of Weld, 1926 from the Philippines and Weld, 1944 from the USA are discussed.