Remarks.—This subspecies of Dipodomys ordii is paler than either of the subspecies with adjoining geographic ranges. Measurements of the skull, in proportion to external measurements, are larger than in any other subspecies of Dipodomys ordii. Cranially, this new subspecies is more closely allied to Dipodomys ordii fuscus but in color appears to be much closer to Dipodomys ordii attenuatus from which it differs markedly in cranial features.
Specimens examined.—Total, 3, all from Durango, distributed as follows: San Juan, 12 mi. W Lerdo, 3 (UM).
Dipodomys ordii priscus Hoffmeister
Dipodomys ordii priscus Hoffmeister, Proc. Biol. Soc. Washington, 55:167, December 31, 1942.
Perodipus longipes, Allen, Bull. Amer. Mus. Nat, Hist., 8:246, November, 1896 (part—the part from Kinney Ranch, Wyoming).
Perodipus montanus richardsoni, Cary, N. Amer. Fauna, 33:141, August 17, 1911 (part—the part from Lay, Colorado).
Periodipus [Dipodomys] ordii luteolus, Svihla, Journ. Mamm.; 12:262, August, 1931 (part—the part from Linwood, Utah).
Type.—Male, no. 89119, Mus. Vert. Zool., Univ. California; Kinney Ranch, 21 mi. S Bitter Creek, 7100 ft., Sweetwater County, Wyoming; obtained on September 16, 1939, by Donald T. Tappe, original no. 766.
Range.—Southwestern Wyoming, extreme northeastern Utah and northwestern Colorado; marginal occurrences are: in Wyoming, 7 mi. N Ft. Washakie and 10 mi. SW Granger; in Colorado, Lay and Snake River south of Sunny Peak.