Tamias umbrinus J. A. Allen, 1890 . Bull. Am. Mus. Nat. Hist., 3:96.

TYPE LOCALITY: "Uintah Mountains, south of Ft. Bridger" Restricted by Howell (1929:94) to Blacks Fork, about 8,000 ft. [2,438 m], Summit Co., Utah [USA] .

DISTRIBUTION: E California and N Arizona to N Colorado, SE and NW Wyoming, and extreme SW Montana (USA).

SYNONYMS: adsitus (J. Allen, 1905); fremonti (White, 1953); inyoensis (Merriam, 1897); montanus (White, 1953); nevadensis (Burt, 1931); sedulus (White, 1953).

COMMENTS: Subgenus Neotamias . Bergstrom and Hoffmann (1991) found species-specific vocalizations, habitats, and bacular characters in sympatric umbrinus and quadrivittatus, but convergence in electromorphs.