A revision of Xyalaspis (Hymenoptera: Anacharitinae) in the American continent is presented. This genus is mentioned for the first time from the Neotropical region. Xyalaspis flavipes Ashmead, 1896 is synonymized with Xyalaspis microstyla Kieffer, 1907 and is found in the Neotropical region. Five new species are described: Xyalaspis aberrans n. sp. (from the Neotropic), Xyalaspis alveolata n. sp. (from the Neotropic), Xyalaspis arapahoe n. sp. (from the Nearctic), Xyalaspis hirsuta n. sp. (from both regions), and Xyalaspis pilosa n. sp. (from the Neotropic). Diagnostic characters of each species are illustrated and data on the biology, distribution, and mesoscutum sculpturing of the genus Xyalaspis are discussed. A key for differentiating the America species of Xyalaspis is presented.