Thomomys idahoensis Merriam, 1901 . Proc. Biol. Soc. Washington, 14:114.

TYPE LOCALITY: USA, Idaho, Clark Co., Birch Creek (10 mi [16 km] S Nicholia [Lemhi Co.], about 6,400 ft. [1940 m]) .

DISTRIBUTION: EC Idaho, adjacent Montana and W Wyoming, and N Utah (USA).

SYNONYMS: confinus Davis, pygmaeus Merriam.

COMMENTS: Subgenus Thomomys . Thaeler (1972, 1977) revised this species. Formerly included in talpoides by Hall and Kelson (1959:441) and Hall (1981:457, 463; but see Hall, 1981: 1179).