Geographic Distribution and Taxonomy of the Chipmunks of Wyoming

by John A. White

Remarks.—Only a few specimens of this subspecies have ever been taken in Wyoming. Little is known about the habits of this chipmunk, which normally is shy and wary.

Specimens examined.—Total number, 6.

Sweetwater Co.: W side Green River, 1 mi. N Utah border, 6.

Additional records (Howell 1929:134): Sweetwater Co.: Green River, 4 mi. NE Linwood, Utah.

Fig. 3. Known occurrences and probable geographic distribution of the subspecies of Eutamias umbrinus in Wyoming. See figure 1 for explanation of symbols.

1. E. u. umbrinus

2. E. u. fremonti

3. E. u. montanus

[ Eutamias umbrinus (J. A. Allen) ]

Diagnosis.—Size large; general tone of upper parts dark; base of baculum widened; outermost dorsal dark stripe barely discernible or lacking; skull rarely shorter than 34.0 mm.

Comparisons.—For comparisons with the other species of Eutamias in Wyoming, see the accounts of E. minimus, E. amoenus, and E. dorsalis.