_Diagnosis._--Size large (see measurements). Color relatively dark, entire dorsal surface between (_16''_) Pinkish Cinnamon and Cinnamon-Buff, purest on sides and flanks, upper parts washed with black; arietiform markings, pinnae of ears, dorsal and ventral stripes of tail, plantar surfaces of hind feet, blackish. Skull large; auditory bullae well inflated; interorbital width relatively narrow; rostrum long and narrow; nasals long and slightly flared distally; pterygoid fossae ovoid; external auditory meatus small and ovoid; jugal light and relatively straight. _Comparisons._--From _Dipodomys ordii chapmani_, _D. o. cupidineus_ differs in: Size larger; color lighter in all pigmented areas; skull larger; rostrum shorter and wider; nasals shorter; auditory bullae more inflated, particularly median tympanic portion; least interorbital width less. From _Dipodomys ordii nexilis_, _D. o. cupidineus_ differs as follows: Size smaller; color lighter in all pigmented areas; skull smaller; rostrum relatively longer and narrower; least interorbital width less; auditory bullae less inflated; breadth across maxillary arches less; foramen magnum circular as opposed to ovoid; cutting edge of upper incisors narrower; zygomatic arches lighter. For comparisons with _Dipodomys ordii cinderensis_, _Dipodomys ordii panguitchensis_ and _Dipodomys ordii longipes_ see accounts of those subspecies. _Remarks._-This subspecies is prevented from intergrading, to the east, with _D. o. longipes_ by the deep canyons of the Colorado River, with _D. o. cinderensis_ by the Virgin River and with _D. o. panguitchensis_ by a series of high mountain ranges. Intergradation does, however, occur with _D. o. sanrafaeli_ in animals from Escalante, Garfield County, Utah, but they are referable to _D. o. cupidineus_. The Colorado River, farther to the north, again serves as a barrier in preventing intergradation between _D. o. nexilis_ and _D. o. cupidineus_. _Specimens examined._--Total, 122, distributed as follows: =Utah=: _Garfield County_: Mouth of Calf Creek, Escalante River, 3 (BYU); Ten Mile Spring, 3 (BYU); Escalante, 3 (BYU). _Washington County_: near Short Creek road, south of town of Virgin, 18 (RH). _Kane County_: near Paria, 1 (UU); Willow Tank Springs, 7 (BYU); 8 mi. NW Kanab, 4800 ft., 1 (UU); near Sand Dunes, 7 (RH); Kanab, 15 (12 MVZ; 2 BYU; 1 UU); 1 mi. S Kanab, 4400 ft., 2 (UU).