Baiomys True, 1894 . Proc. U. S. Natl. Mus. (1893), 16:758 [1894].

TYPE SPECIES: Hesperomys taylori Thomas, 1887 .

COMMENTS: Peromyscine. Revised by Packard (1960). Relegated to a subgenus of Peromyscus by Osgood (1909) but reinstated as a separate genus by Miller (1912b). Relationship to South American forms (e.g., Calomys) advanced by Packard (1960) but other studies have disclosed cognate affinity to Scotinomys (Carleton, 1980; Carleton et al., 1975; Hooper, 1960; Hooper and Musser, 1964a). Karyology evaluated by Yates et al. (1979) and biochemical variation by Calhoun et al. (1989). Hershkovitz (1962) transferred the form hummelincki, erroneously described under Baiomys, to the phyllotine genus Calomys .