Phenacomys Merriam, 1889 . N. Am. Fauna, 2:32.

TYPE SPECIES: Phenacomys intermedius Merriam, 1889 .

COMMENTS: Placed by Gromov and Polyakov (1977) as Arvicolinae incertae sedis; by Zagorodnyuk (1990) as tribe Phenacomyini, including Arborimus; by Repenning et al. (1990) as Arvicolini, including Arvicola and certain extinct genera. Revised by Howell (1926b) and Hall and Cockrum (1953), then including species assigned to Arborimus (see that account).