Tamias minimus grisescens ([Howell])
Eutamias minimus grisescens [Howell], Jour. Mamm., 6:52, February 9, 1925.
Tamias minimus grisescens [Ellerman], Fam. and Genera of Living Rodents, British Mus. Nat. Hist., p. 431, June 8, 1940.
Type.—Obtained at Farmer, Douglas County, Washington, by J. A. Loring, on July 31, 1897; type in United States National Museum.
Racial characters.—Similar to scrutator but smaller; more grayish, less buffy in color, dark stripes narrower and pale stripes wider.
Measurements.—Seven topotypes and near topotypes average: Total length 177; length of tail 78.7; hind foot 26.8; ear 10.6.
Distribution.—Known only from the Columbian Plateau. This race is rare and though we hunted for it in localities where specimens have been collected, including the type locality, it was found but twice. Ranchers living in the area know the chipmunk but see individuals only occasionally. Marginal occurrences are Douglas ([Howell], 1929: 41), Vantage (V. B. S.) and Pasco ([Howell], 1929: 41).
Remarks.—The geographic range of this race is separated from that of scrutator by the Columbia River and many miles of country uninhabited by chipmunks of this species.
Tamias amoenus [Allen]
Yellow-pine chipmunk
Description.—The yellow-pine chipmunk resembles the least chipmunk but is larger. The underside of the tail is more ochraceous, less yellowish. The color of the sides varies considerably in the various races. The stripes are narrow and sharply delineated, the dorsal one being black. Next lower is a grayish stripe, followed by one of brownish black. The lower stripe is white. The underparts, in most races, are white but in luteiventris are buffy.