Measurements.—Five male and three female topotypes average, respectively: total length 213, 209; length of tail 60, 58; hind foot 29, 28.
Distribution.—Walla Walla County, between the Snake River and the Oregon boundary and from the Columbia River east to the Columbia County line.
Thomomys talpoides aequalidens [Dalquest]
Thomomys talpoides aequalidens [Dalquest], Murrelet, 23:3, May 14, 1942.
Type.—Obtained at Abel Place, 2,200 ft., 6 miles south-southeast of Dayton, Columbia County, Washington, by S. H. Lyman, on April 6, 1934; type in Museum of Vertebrate Zoölogy.
Racial characters.—Large size, very dark color.
Measurements.—The average of four male topotypes and the measurements of one female topotype are, respectively: total length 202, 201; length of tail 57, 59; hind foot 26, 27.
Distribution.—Southeastern Washington east of the range of columbianus and north of the higher parts of the Blue Mountains.
Thomomys talpoides wallowa [Hall] and [Orr]
Thomomys quadratus wallowa [Hall] and [Orr], Proc. Biol. Soc. Washington, 46:41, March 24, 1933.