_Remarks._--The characters of this subspecies are stable throughout most of its geographic range. It is not known to intergrade with adjacent forms. One specimen, a male, available from the Snake River, south of Sunny Peak, Colorado, however, is not typical of _D. o. priscus_, in that it has a wider and deeper rostrum than any other specimen from the entire range. Between _D. o. priscus_ and _D. o. luteolus_, the skull, but not the color, provides diagnostic differences. The Red Desert of Wyoming is mostly sandy but there are large exposures of rock and gravel. At the type locality of _D. o. priscus_ rockier soil predominates but is interspersed with stabilized sand dunes where the kangaroo rats are abundant. Traps set on the rocky soils, in a continuous line between the dunes, yielded no kangaroo rats. Kangaroo rats in the area of the Kinney Ranch, Wyoming, apparently form a good source of food for owls, since many bones (jaws and limb elements) were found in owl pellets at the bases of cliffs approximately 5 miles northeast of the ranch buildings. _Specimens examined._--Total, 72, distributed as follows: =Wyoming=: _Fremont County_: 7 mi. N Fort Washakie, 1 (USBS); Fort Washakie, 1 (USBS); Wind River, 1 (USBS). _Sweetwater County_: Eden, 1 (USBS); 5 mi. E Rock Springs, 1 (UM); 10 mi. SW Granger, 13 (UM); Bitter Creek, 9 (6 AMNH; 3 CNHM); Kinney Ranch, 21 mi. S Bitter Creek, 18 (MVZ); Shell Creek, 25 mi. S Bitter Creek, 3 (CM); 30 mi. S Bitter Creek, 3 (KU); 33 mi. S Bitter Creek, 8 (KU). _Carbon County_: 20 mi. W Baggs, 2 (USBS). =Utah=: _Daggett County_: E bank Green River, 4 mi. E Linwood, 4 (CM). =Colorado=: _Moffat County_: Snake River, south of Sunny Peak, 1 (USBS); 20 mi. NW Sunbeam, 4 (CM); Bear River, Lay, 1 (USBS). _Rio Blanco County_: W side White River, 1 mi. N Rangely, 1 (CM). =Dipodomys ordii celeripes= Durrant and Hall _Dipodomys ordii celeripes_ Durrant and Hall, Mammalia, 3:10, March, 1939. _Dipodomys ordii columbianus_, Hall, Univ. California Publ. Zool., 37:5, April 10, 1931. _Type._--Male, adult, no. 1956, Museum of Zoology, University of Utah; Trout Creek, 4600 ft., Juab County, Utah; obtained on May 5, 1937, by Stephen D. Durrant, original no. 1168. _Range._--Eastern Nevada, western and west-central Utah, east to eastern Sevier County, Utah; marginal occurrences are: in Nevada, Tecoma, Cobre and 8 mi. SE Mt. Moriah; in Utah, E side Clear Lake, U. B. (Yuba) Dam, 10 mi. SW Nephi, and Trout Creek.