Dipodomys ordii longipes, Stanford, Journ. Mamm., 12:360, November, 1931 (part—the part from King's Ranch, Utah).
Type.—Female, adult, no. 4612, Museum of Zoology, University of Utah; 1-1/2 mi. N Price, 5567 ft., Carbon County, Utah; obtained on June 5, 1940, by Ross Hardy and H. Higgins, original no. 1901.
Range.—East-central Utah, east into west-central Colorado. Marginal occurrences are: in Utah, 12 mi. E Price, 1-1/2 mi. N Price, Notom, King's Ranch, 12 mi. SW Green River, 16 mi. NW Moab; in Colorado, State Line and Grand Junction.
Diagnosis.—Size large (see measurements). Color dark, entire dorsal surface Cinnamon-Buff, purest on sides and flanks with but slight suffusion of black on upper parts; cheeks white; arietiform markings, pinnae of ears, plantar surfaces of hind feet, dorsal and ventral stripes of tail, brownish-black. Skull large; pterygoid fossae ovoid; lacrimal processes small; width across maxillary arches relatively great; auditory bullae well inflated; diastema short.
Comparisons.—From Dipodomys ordii longipes, D. o. sanrafaeli differs as follows: Size smaller; color lighter, more cinnamon, pinnae of ears lighter; skull smaller; auditory bullae smaller; pterygoid fossae ovoid rather than round; wider across occipital condyles; narrower across zygomatic processes of maxillae.
From Dipodomys ordii cupidineus, D. o. sanrafaeli can be recognized by its larger size, lighter color and larger skull.
For comparisons with Dipodomys ordii nexilis, Dipodomys ordii priscus and Dipodomys ordii uintensis see accounts of those subspecies.
Remarks.—Intergradation between Dipodomys ordii cupidineus and D. o. sanrafaeli is noted in the intermediate size of body in a single specimen from Notom. Intergradation in color and cranial characters occurs between Dipodomys ordii nexilis and D. o. sanrafaeli in specimens from 16 miles northwest of Moab. All these specimens, however, are referable to D. o. sanrafaeli.
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: