Animals from that part of the range of _D. o. sanrafaeli_ west of the Green River are typical while those to the east of the river are all intergrades. Animals from 16 miles northwest of Moab, Utah, and from three localities in Colorado, even though intergrades with _D. o. nexilis_, are all referable to _D. o. sanrafaeli_. It appears that the Green River does not act as a complete barrier in this area since in the winter it occasionally freezes over, thus allowing the animals to cross. It is thought that kangaroo rats do not hibernate but remain more or less active throughout the winter. Man-made conveniences, such as bridges, might also serve as means of dispersal, permitting these animals to cross otherwise prohibitive barriers. Where there are no bridges across the Green River, farther to the south, the rats apparently do not cross the river; steep, rocky canyon-walls and the lack of ice on the water in winter lessen the chances of small mammals crossing from one side to the other. _Specimens examined._--Total, 30, distributed as follows: =Utah=: _Carbon County_: 12 mi. NE Price, 2 (CM); 3 mi. NE Price, 1 (RH); 1-1/2 mi. N Price, 2 (1 RH; 1 UU); Wellington, 1 (RH). _Emery County_: "San Rafael, 21 mi. out," 1 (USAC); 12 mi. SW Green River, 2 (CM). _Grand County_: 1 mi. E Green River, 1 (MVZ); 16 mi. NW Moab, 2 (CM). _Wayne County_: Notom, 1 (BYU). _Garfield County_: King's Ranch, 4800 ft., 3 (2 UU; 1 USAC). =Colorado=: _Mesa County_: State Line, 11 (MVZ); Fruita, 1 (USBS); Grand Junction, 2 (USBS). =Dipodomys ordii panguitchensis= Hardy _Dipodomys ordii panguitchensis_ Hardy, Proc. Biol. Soc. Washington, 55:90, June 25, 1942. _Type._--Male, adult, no. 4375, Museum of Zoology, University of Utah; one mile south of Panguitch, 6666 ft., Garfield County, Utah; obtained on August 31, 1940, by Ross Hardy, original no. 2151. _Range._--Known only from the type locality. _Diagnosis._--Size small (see measurements). Color dark, entire dorsal surface near Olive-Brown, purest on sides and flanks, upper parts strongly suffused with black; cheeks white; arietiform markings, pinnae of ears, plantar surfaces of hind feet, dorsal and ventral stripes of tail which are wider than white lateral stripes, blackish. Skull small; rostrum relatively short and wide; interorbital region wide; interparietal region wide; foramen magnum elongate dorsoventrally; pterygoid fossae ovoid. _Comparisons._--From _Dipodomys ordii utahensis_, which it closely resembles, _D. o. panguitchensis_ differs in: Size larger; color darker; interparietal region wider; foramen magnum elongate dorsoventrally as opposed to nearly round; pterygoid fossae ovoid as opposed to nearly round.