Taxonomy of the Chipmunks, Eutamias quadrivittatus and Eutamias umbrinus

by John A. White

Comparisons.—From Eutamias umbrinus adsitus, the subspecies to the south on the Wasatch Range, E. u. umbrinus differs in: Sides lighter; rump browner; hairs around outermost edge of tail tawnier (in freshly molted tails); shorter inner mandibular length.

From E. u. inyoensis, the subspecies to the west in central and northeastern Nevada and in northwestern Utah, E. u. umbrinus differs in: General tone of upper parts lighter; sides lighter; total length more; interorbital region broader.

For comparisons with E. u. sedulus, E. u. fremonti, and E. u. montanus, see the accounts of those subspecies.

Specimens examined.—Total number, 55.

Wyoming: Uinta Co.: 9 mi. S Robertson, 8,000 ft., 15; 10 mi. S and 1 mi. W Robertson, 8,700 ft., 5; 11½ mi. S and 2 mi. E Robertson, 9,200 ft., 1; 2 mi. E and 12 mi. S Robertson, Ashley Nat. For., 1; 13 mi. S and 2 mi. E Robertson, 9,200 ft., 1.

Utah: Rich Co.: Monte Cristo, 18 mi. W Woodruff, 8,000 ft., 2 UU. Summit Co.: 13½ mi. S and 2 mi. E Robertson [Wyoming], 4; 1 mi. N Bridger Lake R. S., 9,400 ft., 4. Wasatch Co.: Snake Creek Canyon, 3 mi. NW Midway, 6,000 ft., 1 UU. Uintah Co.: Paradise Park, 21 mi. W and 15 mi. N Vernal, 10,050 ft., 20.

Eutamias umbrinus adsitus J. A. Allen

Eutamias adsitus J. A. Allen, Brooklyn Institute Mus. Sci. Bull. 1:118, March 31, 1905.

Type.—Unsexed adult, skull and skin, No. 28728 Amer. Mus. Nat. Hist.; from Briggs Meadow, 10,000 ft., Beaver Mountains, Utah; obtained on August 20, 1904, by George P. Engelhardt.