Abstract
The North American species of the genusAcidotaStephens are revised. Three species are recognized, the Holarctic speciesquadrata(Zetterstedt) andcrenata(Fabricius) and the eastern North American speciessubcarinataErichson. All major generic and specific characters are illustrated with line drawings and scanning electron photomicrographs. A key is included to aid in identifying the species.Olophrum crenulatumHatch is placed in synonymy withA. quadrata.