Sorex nanus Merriam, 1895 . N. Am. Fauna, 10:81.

TYPE LOCALITY: USA, "Estes Park [Larimer Co.], Colorado " .

DISTRIBUTION: Rocky Mountains from Montana to New Mexico; South Dakota; Arizona (USA).

COMMENTS: Subgenus Otisorex . Very similar to, and perhaps conspecific with, tenellus, see review by Hoffmann and Owen (1980, Mammalian Species, 131); but George (1988) retained both as distinct species.