Measurements.—Fifteen males and 10 females from western Washington average, respectively: total length 254.7, 258.6; length of tail 116, 122; hind foot 36.7, 37.1; ear 20.5, 20.4; weight 72, 81.2 grams.
Distribution.—The humid coastal belt of western Washington, from the western base of the Cascade Mountains to the Pacific, exclusive of the Olympic Mountains. When A. H. [Howell] revised the chipmunks in 1929, he employed a concept of a subspecies different from the writer's own. The locality records listed by [Howell] (1929: 109-112) for Tamias townsendii townsendii and T. t. cooperi are not in agreement with [Howell]'s own distribution map (op. cit.: 107). When the localities listed by [Howell] are plotted on a map of Washington, the ranges of the two races overlap in some critical areas. Not all of the material examined by [Howell] was seen by the writer, and, consequently, the ranges shown in Fig. 83 are plotted, in part, on geographic grounds.
Marginal localities on the east, so plotted, for T. t. townsendii, are: Hamilton (U. S. N. M.), 5 mi. E. Monroe (W. W. D.), Redmond (W. W. D.), Roy (U. S. N. M.), and Vancouver (U. S. N. M.).
Tamias townsendii cooperi [Baird]
Tamias cooperi [Baird], Proc. Acad. Nat. Sci. Philadelphia, 7:334, 1855.
Tamias townsendii var. cooperi [Baird], Mamm. N. Amer., p. 737, 1857.
Eutamias cooperi Lyon, Smithsonian Misc. Coll., 50:89, June 27, 1907.
Eutamias townsendii cooperi [Howell], Jour. Mamm., 3:184, August 4, 1922.
Type.—Cotypes obtained at Klickitat Pass, 4,500 ft., Skamania County, Washington, by J. S. Cooper in July, 1853; in United States National Museum.
Racial Characters.—Similar to T. t. townsendii but paler with pale stripes whitish rather than cinnamon.