Thomomys talpoides yelmensis [Merriam]
Thomomys douglasi yelmensis [Merriam], Proc. Biol. Soc. Washington, 13:21, January 31, 1899.
Thomomys douglasii yelmensis [Taylor], Proc. Biol. Soc. Washington, 32:169, September 30, 1919.
Thomomys talpoides yelmensis [Goldman], Jour. Mamm., 20:235, May 15, 1939.
Type.—Obtained at Tenino, Thurston County, Washington, by C. P. Streator on October 24, 1891; type in United States National Museum.
Racial characters.—A rather small, yellowish race with whitish underparts.
Measurements.—Twenty-one male and 21 female topotypes average, respectively; total length 213, 202; length of tail 64, 61; hind foot 29, 28; and weight 121, 101 grams.
Distribution.—Known only from Grand Mound Prairie (type locality), Vail Prairie, near Vail, and Rochester Prairie, near Rochester, all in Thurston County.