The genus Orchestomerus Dietz contains four species in the USA: O. wickhami Dietz, O. eisemani Yoshitake and Anderson, new species, O. marionis (Fall), resurrected species and new combination, and O. whiteheadi Colonnelli. Orchestomerus ulkei Dietz, previously considered the valid name for O. marionis, is a new junior subjective synonym of Auleutes epilobii (Paykull), which in turn makes Platymeristes Dietz a new junior synonym of Auleutes Dietz. Diagnostic features of Orchestomerus, illustrations of the four species, and a key to separate them are presented. Orchestomerus species are associated with Vitaceae: Cissus trifoliata (l.) L. for O. wickhami in Texas; Parthenocissus quinquefolia (L.) Planch. for O. eisemani in Indiana, Maryland, Massachusetts, and North Carolina, Vitis sp. for O. marionis in Georgia and Missouri, and Vitis arizonica Engelm. for O. whiteheadi in Arizona.