Type.—Obtained at White Salmon, Klickitat County, Washington, by J. A. Loring on June 26, 1897; type in United States National Museum.
Racial characters.—Similar to immunis but darker with smaller, shorter skull.
Measurements.—One male and 13 female topotypes average, respectively: total length 210, 198; length of tail 55, 56; hind foot 30, 28.
Distribution.—The lower Columbia River Valley, from the type locality east to the Columbian Plateau.
Thomomys talpoides douglasii (Richardson)
Geomys douglasii Richardson, Fauna Boreali-American, 1:200, 1829.
Geomys fuliginosus Schinz, Syn. Mamm., 2:136, 1846 (type from "Habitat ad fluvium Columbia").
Thomomys douglasii [Allen], Bull. Amer. Mus. Nat. Hist., 5:66, April 28, 1893.
Thomomys douglasi douglasi [Bailey], N. Amer. Fauna, 39:116, November 15, 1915.
Thomomys talpoides douglasii [Goldman], Jour. Mamm., 20:234, May 15, 1939.