Specimens examined.—Total, 34, all from Utah, distributed as follows: Tooele County: Old Lincoln Highway, 18 mi. SW Orr's Ranch in Skull Valley, 4400 ft., 9 (UU). Juab County: Fish Springs, 4400 ft., 4 (UU); 7 mi. S Fish Springs, 4400 ft., 4 (UU). Millard County: 1 mi. N Lynndyl, 4768 ft., 5 (UU); Lynndyl, 4768 ft., 1 (UU); Hinckley, 4600 ft., 11 (UU).
Dipodomys ordii nexilis [Goldman]
Dipodomys ordii nexilis [Goldman], Journ. Washington, Acad. Sci., 23:470, October 5, 1933.
Perodipus longipes, [Warren], Mammals of Colorado, p. 77, 1910 (part—the part from Coventry, Colorado).
Dipodomys ordii longipes, Moore, Journ. Mamm., 10:260, August, 1929 (part—the part from Monticello, Utah).
Type.—Male, adult, no. 149938, U. S. Nat. Mus. Biol. Surv. Coll.; 5 mi. W Naturita, Montrose County, Colorado; obtained on July 20, 1907, by Merritt Cary, original no. 1068.
Range.—West-central Colorado, southwest into San Juan County, Utah, north of the San Juan River; northwest into Grand County, Utah, to the Colorado River; and westward probably as far as the Colorado River; marginal occurrences are: in Utah, Cisco, 18 mi. NE Moab, and Blanding; in Colorado, 5 mi. W Naturita, and Coventry.
Diagnosis.—Size medium (see measurements). Color dark, entire dorsal surface between (a) Cinnamon-Buff and Clay Color, purest on sides and flanks, upper parts strongly suffused with black; arietiform markings, pinnae of ears, plantar surfaces of hind feet, dorsal and ventral tail-stripes blackish. Lateral white stripes of tail less than one fourth of diameter of tail. Skull large; rostrum long and narrow; nasals long; auditory bullae strongly inflated; braincase not inflated; pterygoid fossae ovoid.
Comparisons.—From Dipodomys ordii sanrafaeli, D. o. nexilis differs in: Color darker; skull smaller in all measurements taken; auditory bullae noticeably smaller; width across zygomatic processes of maxillae less.
From Dipodomys ordii longipes, D. o. nexilis differs in: Size smaller; color darker in all respects; rostrum wider; breadth across auditory bullae less; interorbital width greater; breadth across zygomatic processes of maxillae less; cutting edge of upper incisors wider; zygomatic arch lighter and more nearly straight.