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

COMMENT: Revised by Howell, 1926, N. Am. Fauna, 48:66 pp. Formerly included Arborimus; see Johnson, 1973, J. Mammal., 54:239-244, and Johnson and Maser, in press, Northwest. Sci. Placed by Gromov and Polyakov, 1977:336, as genus incertae sedis.

ISIS NUMBER: 5301410008084000000.