Geographic Variation
in Red-backed Mice (Genus Clethrionomys)
of the Southern Rocky Mountain Region
BY
E. LENDELL COCKRUM and KENNETH L. FITCH
In the course of the preparation of a synopsis of the North American terrestrial microtines by one of us (Cockrum), and the completion of a Master's thesis on the geographical variation of the red-backed mice of Wyoming by the other (Fitch) we had occasion to study the red-backed mice of the southern Rocky Mountain region (see figure 1). Results of these studies are the recognition of two heretofore unnamed subspecies of the red-backed mouse in the southern Rocky Mountain region, and a clarification of the taxonomic status of two additional kinds.
Clethrionomys gapperi galei (Merriam)
1890. Evotomys galei Merriam, N. Amer. Fauna, 4:23, October 8.
1931. Clethrionomys gapperi galei, Hall, Univ. California Publ. Zool., 37:6, April 10.
1897. Evotomys gapperi galei, Bailey, Proc. Biol. Soc. Washington, 11:126, May 13.