Distribution.—Northeastern Washington from Sherman Creek Pass (W. W. D.) on the west to Pass Creek Pass on the east.
Clethrionomys gapperi idahoensis ([Merriam])
Evotomys idahoensis [Merriam], N. Amer. Fauna, 5:66, July 30, 1891.
Clethrionomys gapperi idahoensis [Whitlow] and [Hall], Univ. California Publ. Zoöl., 40:265, September 30, 1933.
Type.—Obtained at Sawtooth (Alturas) Lake, 7,200 ft., Blaine County, Idaho, by C. H. [Merriam] and V. [Bailey], on October 4, 1890; type in United States National Museum.
Racial characters.—Similar to saturatus but brain case longer and narrower and dorsal area more reddish.
Measurements.—Seven males and 6 females from the Blue Mountains average, respectively: total length 138, 142; length of tail 41, 41; hind foot 18.7, 19.0; ear 13.6, 13.5; weight 20.5, 22.7 grams.
Distribution.—The Blue Mountains of southeastern Washington.