Abstract
Diagnostic characters for the Western Palaearctic genus Chilaspis and a key for its separation from closely related genera, Biorhiza, Cynips, Plagiotrochus, and Dryocosmus are given. Dryocosmus mayri is transferred to the genus Chilaspis. Chilaspis nitida spp. israeli is considered as a valid species: Chilaspis israeli Sternlicht, 1968, n. stat. Lectotypes of Chilaspis nitida, Ch. loewii, Ch. israeli n. stat. and Ch. mayri n. comb. are designated. Redescriptions, diagnostic characters and a species key are also given. Chilaspis tivoni and Ch. miriami (Sternlicht, 1968b, in litt.) are nomina nuda. Cynipid inquilines and parasitoids reared from galls of Chilaspis mayri are given for the first time. Cynips ampullaeformis Méhes, 1953, C. cadiformis Méhes, 1953, C. dissimilis Méhes, 1953, and Dryocosmus confusus Méhes, 1953 are nomina nuda; Biorhiza weldi Yasumatsu and Matsuda, 1955 is a n. syn. of B. nawai (Ashmead, 1904).
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