_Racial characters._--Small size, grayish color including rump, and white underparts. _Measurements._--Fourteen males and 7 females from Washington average: total length 201.5; length of tail 86.5; hind foot 31.7; ear 17.2. _Distribution._--The eastern slope of the Cascade Mountains. Marginal records on the west are: Bald Mountain (Howell, 1929:73), Mazama (Howell, 1929:73), Hart Lake (Howell, 1929:73), Lake Wenatchee (W. W. D.), 10 mi. S. Dryden (W. W. D.), Blewett Pass (W. W. D.), 10 mi. N. W. Ellensburg (W. W. D.), Wenas Creek (W. W. D.), Mt. Adams (Howell, 1929:73), and Lyle (Howell, 1929:73). Marginal occurrences on the east are: Mt. Chopaka (Howell, 1929:73), 20 mi. E. Tonasket (W. W. D.) and Omak Lake (Howell, 1929:73). =Tamias amoenus canicaudus= (Merriam) _Eutamias canicaudus_ Merriam, Proc. Biol. Soc. Washington, 16:77, May 29, 1903. _Eutamias amoenus_ canicaudus Howell, Jour. Mamm., 3:184, August 4, 1922. _Tamias amoenus canicaudus_ Ellerman, Fam. and Genera of Living Rodents, British Mus. Nat. Hist., p. 432, June 8, 1940. _Type._--Obtained at Spokane, Spokane County, Washington, by C. P. Streator, on April 11, 1891; type in United States National Museum. _Racial characters._--Large size, pale color, grayish tail, white or buffy underparts. _Measurements._--Thirteen topotypes average: total length 227.2; length of tail 104.4; hind foot 33.7; ear 14. _Distribution._--The pine-covered lowlands along the central-eastern border of the state, ranging, according to Howell (1929: 71), from Spokane County south to Pullman. =Tamias amoenus luteiventris= Allen _Tamias quadrivittatus luteiventris_ Allen, Amer. Mus. Nat. Hist. Bull., 3:101, June, 1890. _Eutamias quadrivittatus luteiventris_ Miller and Rehn, Proc. Boston Soc. Nat. Hist., 30:44, December 27, 1901. _Eutamias amoenus luteiventris_, Howell, Jour. Mamm., 3:179, August 4, 1922. _Tamias amoenus luteiventris_ Ellerman, Fam. and Genera of Living Rodents, British Mus. Nat. Hist., p. 432, June 8, 1940. _Type._--Obtained at Chief Mountain Lake (Waterton Lake), Alberta (3-1/2 mi. N. United States boundary) by Elliott Coues on August 24, 1874; type in United States National Museum. _Racial characters._--Small size, rich color, buffy underparts. _Measurements._--Twelve males and 12 females from the Blue Mountains, Columbia County, average respectively: total length 212, 219; length of tail 96.7, 101; hind foot 31.7, 32.5; ear 17.3, 18; weight 46.5, 52.8 grams.