Type.—Obtained 4 miles south of Olympia, Thurston County, Washington, by W. W. [Dalquest], on December 31, 1941; type in United States National Museum.
Racial characters.—Similar to glacialis but underparts not tinged with orange and conspicuous dusky areas present on sides of neck.
Measurements.—Fourteen male and 19 female topotypes average, respectively: total length 223, 205; length of tail 62, 59; hind foot 30, 29; and weight 123, 96 grams.
Distribution.—Known only from the type locality.
Thomomys talpoides tumuli [Dalquest] and [Scheffer]
Thomomys talpoides tumuli [Dalquest] and [Scheffer], Proc. Biol. Soc. Washington, 55:96, August 13, 1942.
Type.—Obtained on Rocky Prairie, 7 miles north of Tenino, Thurston County, Washington, by W. W. [Dalquest] on January 2, 1942; type in United States National Museum.
Racial characters.—Similar to pugetensis but grayer, less yellow.
Measurements.—Eleven male and 14 female topotypes average, respectively: total length 225, 216; length of tail 60, 64; hind foot 31, 30; and weight 140, 118 grams.
Distribution.—Known only from the type locality.