Type.—Obtained 5 miles east of Warm Lake, 7,000 feet elevation, Valley County, Idaho, by W. B. [Davis]; type in Museum of Vertebrate Zoölogy.
Racial characters.—Similar to kootenayensis but brighter in color, more ochraceous. Similar to oregonus but paler, more yellowish.
Measurements.—[Davis] (1939:339) gives the measurements of six adult topotypes as: total length 240; length of tail 144; hind foot 31.
Distribution.—A single specimen in the Charles R. Conner Museum from Kamiak Butte, Whitman County, is referable to this race.
Zapus princeps oregonus Preble
Zapus princeps oregonus Preble, N. Amer. Fauna. 15:24, August 8, 1899.
Type.—Obtained at Elgin, Union County, Oregon, by E. A. Preble, on May 29, 1896; type in United States National Museum.
Racial characters.—Small size, pale color.
Measurements.—Three males and 3 females from the Blue Mountains average, respectively: total length 233, 234; length of tail 138, 139; hind foot 31.8, 31.8; ear 16, 16; weight 29, 33 grams.
Distribution.—The Blue Mountains of southeastern Washington.