Two new species of the Euxoa westermanni species-group from Canada (Lepidoptera, Noctuidae, Noctuinae)

Two new species of Euxoa Hubner are described from northern and western Canada: Euxoa apopsis Troubridge & Lafontaine, related to E. macleani McDunnough, and E. muldersi Lafontaine & Hensel, related to E. churchillensis McDunnough. Euxoa chimoensis Hardwick, stat. rev., is recognized as a valid species rather than as a subspecies of Euxoa macleani. A diagnosis of the E. westermanni species-group is given with descriptions and illustrations of the new species and their relatives.