A revision of Xyalaspis Hartig, 1843 (Hymenoptera: Anacharitinae) in the Western Palaearctic region is given. Xyalaspis spinigera Reinhard, 1860 and Xyalaspis subulifera (Thomson, 1862) are synonymized with Xyalaspis laevigata Hartig, 1843 and Xyalaspis rugosa Hartig, 1843 respectively, and their distribution areas are extended. A new species Xyalaspis pseudolaevigata n. sp. is described from France. One species previously assigned to the genus Xyalaspis, X. laevis (Hedicke, 1914), is transferred to Aegilips Haliday, 1835. Diagnostic characters are illustrated and data about biology, distribution and morphological variability of the studied species are presented and discussed. A key to differentiate the Western Palaearctic species of Xyalaspis is included.
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