Microtus montanus (Peale, 1848) . Mammalia and Ornithology in U.S. Expl. Exped..., 8: 44.

REVIEWED BY: R. E. Barry, Jr. (REB).

TYPE LOCALITY: U.S.A., California, Siskiyou Co., headwaters of Sacramento River, near Mt. Shasta .

DISTRIBUTION: British Columbia (Canada) and C. Montana south to New Mexico and Arizona, west through the Cascade Mtns, and Sierra Nevada (U.S.A.).

COMMENT: Subgenus Microtus; see Anderson, 1960:204; two karyotypically different forms are known, which may represent distinct species; see Judd et al., 1980, J. Mammal., 61: 109- 113. Revised by Anderson, 1959, Univ. Kans. Publ. Mus. Nat. Hist., 9:415-511.

ISIS NUMBER: 5301410008080027001.