Distribution.—Southeastern Washington, westward as far as 5 miles east of Wallula (M.V.Z.).
Microtus montanus canescens [Bailey]
Microtus nanus canescens [Bailey], Proc. Biol. Soc. Washington, 12:87, April 30, 1898.
Microtus montanus canescens [Hall], Proc. Biol. Soc. Washington, 51:133, August 23, 1938.
Type.—Obtained at Conconully, Okanogan County, Washington, by J. A. Loring, on September 12, 1897; type in United States National Museum.
Racial characters.—Size small; color of upper parts pale brownish gray; sides yellowish gray. This race differs from Microtus m. nanus in generally paler, less brownish coloration. It does not differ from nanus in any distinctive cranial features.
Measurements.—Two male and 2 female topotypes average, respectively: total length 151, 143; length of tail 35, 33.5; hind foot, 19.5, 19.5. A series of 8 males and 6 females from Selah, Yakima County, average, respectively: total length 151.7, 150.5; length of tail 41.5, 40.1; hind foot 19.7, 18.8; ear 12.8, 13.0; weight 47.2, 36.8 grams.
Distribution.—The eastern foothills of the Cascade Mountains from the British Columbian boundary south, probably to the Columbia River. Recorded east to Benton City ([Taylor] and [Shaw], 1929: 24).
Remarks.—A large series from Selah, Yakima County, is somewhat intermediate between nanus and canescens. These specimens from south of the Wenatchee Mountains are, however, more like canescens in color than they are like nanus.
[Bailey] (1900: 32) records a specimen of this race from North Yakima as Microtus canicaudus.