align="center">6.9

3.4 min. 21.4 14.0 17.1 11.8 4.9 4.9 8.0 6.7 3.3 max. 22.4 14.9 17.4 12.6 5.0 5.4 8.5 7.1 3.5 P. f. litus, topotype ♀ 160599 USBS 22.2 14.7 17.4 11.9 5.0 5.0 8.7 7.0 3.3 8 mi. SE Lost Soldier, 6700 ft., Wyoming ♀ 166866 USBS 22.1 14.6 17.4 12.0 5.2 4.5 8.4 7.1 3.3 P. f. callistus, Sweetwater County, Wyoming 10, 6 ♂ and 4 ♀ 23.1 15.1 18.0⁸ 12.9⁸ 5.2 4.5 8.7 7.6 3.4 min. 22.7 14.7 17.5 12.7 5.0 4.1 8.5 7.3 3.3 max. 24.4 15.9 18.9 13.1 5.4 4.9 8.9 7.8 3.5

LITERATURE CITED

Cary, M.
1911. A new pocket mouse from Wyoming. Proc. Biol. Soc. Washington, 24:61, March 22. 1917. Life Zone investigations in Wyoming. N. Amer. Fauna, 42:1-95, October 3.

Durrant, S. D. 1952. Mammals of Utah, taxonomy and distribution. Univ. Kansas Publ., Mus. Nat. Hist., 6:1-549, August 10.

Goldman, E. A. 1918. Five new mammals from Arizona and Colorado. Proc. Biol. Soc. Washington, 31:21-26, May 16.

Moore, J. E. 1953. Notes on three additions to the rodent fauna of Alberta. Canadian Field Nat., 66:142-143, February 28.

Osgood, W. H. 1900. Revision of the pocket mice of the genus Perognathus. N. Amer. Fauna, 18:1-72, September 20.

Swenk, M. H. 1940. A study of the geographical and