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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.
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Lafontaine et al. (2010) studied this question.
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