and 1 [F] | 21.9 | 14.4 | 17.3 | 12.2 | 4.9 | 5.2 | 8.2 | 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 [F] 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 [F] 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 [M] | | | | | | | | | and 4 [F] | 23.1 | 15.1 | 18.0^8| 12.9^8| 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 -----------+-------+-------+-------+-------+-----+-----+------+-----+----- [Footnote 1: Basal length was taken from the anteriormost inferior border of the foramen magnum to the anteriormost projections of the incisors.] 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 ecological distribution of the buffy plains pocket mouse (Perognathus flavescens flavescens), with description of a new subspecies from Nebraska. Missouri Valley Fauna, 3:1-8, June 5. _University of Kansas Museum of Natural History, Lawrence, Kansas. Transmitted, April 20, 1953._ 24-7673