_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. The geographic range of the species is west of the Great Plains from central British Columbia to central California. There are twelve races, six of them occurring in Washington. The yellow-pine chipmunk is a small animal, being but little larger than the least chipmunk, and much smaller than _townsendii_. Externally it may be separated from the Townsend chipmunk by its small size, sleek, appressed pelage and brighter color. Separation from _minimus_ is more difficult but, in the Washington races of _minimus_, the colored fur of the underside of the tail is pale yellowish while in _amoenus_ it is more ochraceous or buffy. So far as is known, the two species do not occur together in Washington. The yellow-pine chipmunks live in open woods, brushy areas, clearings, and rocky outcrops. Suitable conditions are abundant in mountainous areas and the distribution of mountain ranges affects the distribution of these chipmunks. Where yellow pine forests descend to relatively low altitudes, the chipmunks enter the lowlands. Such conditions are present in some places along the eastern base of the Cascades, the inter-mountain river valleys of northeastern Washington, and along the central-eastern border of the state.