Specimens examined.—Total, 91, all from Utah, distributed as follows: Box Elder County: Promontory Point, 1 (USNM). Weber County: Ogden, 4293 ft., 20 (7 BYU; 7 MVZ; 4 USNM); Little Mountain, 1 (USNM). Davis County: Antelope Island, Great Salt Lake, 4250 ft., 5 (USNM). Tooele County: Bauer, 4500 ft., 6 (UU); St. John, 4300 ft., 4 (UU); Little Valley, Sheeprock Mountains, 5500 ft., 1 (UU); Clover Creek, Onaqui Mountains, 5500 ft., 1 (UU). Salt Lake County: Plain, 4 mi. N Draper, 4500 ft., 1 (UU). Utah County: Fairfield, Cedar Valley, 4800 ft., 15 (9 BYU; 6 UU); W Lake Mountains, 9 (BYU); Provo, 4510 ft., 10 (MVZ); Sand Dunes W Curtis Station, 4 (BYU). Juab County: Nephi, 2 (1 USNM; 1 MVZ); 4 mi. W Nephi, 1 (RH). San Pete County: Spring City, 4 (LACM). Sevier County: 1 mi. W Aurora, 5190 ft., 6 (5 UU; 1 USNM).
Dipodomys ordii columbianus (Merriam)
Perodipus ordi columbianus Merriam, Proc. Biol. Soc. Washington, 9:115, June 21, 1894.
Dipodomys phillipii, Baird, U. S. P. R. R. Expl. and Surveys, Gen. Rept., p. 412, 1857 (part—the part from Ft. Walla Walla, O. T.).
Cricetodipus ordii columbianus, Trouessart, Catalogus Mammalium, 1:581, 1897.
Perodipus ordii columbianus, [Goldman], Proc. Biol. Soc. Washington, 30:113, May 23, 1917.
Dipodomys ordii columbianus, [Grinnell], Journ. Mamm., 2:96, May 2, 1921.
Type.—Female, adult, no. 24181/31594, U. S. Nat. Mus., Dept. of Agriculture, Coll.; Umatilla, Plains of Columbia, Umatilla County, Oregon; obtained on October 18, 1890, by Clark P. Streator, original no. 386.
Range.—Southeastern Washington, eastern Oregon, southwestern Idaho, northwestern, northern and most of northeastern Nevada; marginal occurrences are: in Washington, 2 mi. SW Paterson, 4 mi. E Burbank and Wallula; in Oregon, 7 mi. E Madras, 2 mi. E Prineville and Guano Valley; in California, Eagleville, Red Rock, Observation Peak, 5 mi. E Litchfield, Honey Lake, Vinton; in Nevada, 3-1/2 mi. E Flanigan, 6 mi. S Pahrum Peak, 2-1/2 mi. E and 11 mi. N Gerlach, 2 mi. SW Quinn River Crossing, 1 mi. SE Tuscarora, 5 mi. N Beowawe, 1/2 mi. S Beowawe, 2-1/2 mi. NE Smiths Creek Ranch, Bells Ranch, 5 mi. W Austin, 8 mi. W Eureka, 4 mi. S Shoshone, 5 mi. SE Greens Ranch, and 22 mi. N Deeth; in Idaho, 8 mi. W Rodgerson, 6 mi. SW American Falls, 4 mi. NE American Falls, 5 mi. NW Michaud, Arco, Hammett and Payette; in Oregon, Umatilla.
Diagnosis.—Size medium (see measurements). Color dark, entire dorsal surface (16") between Pinkish Cinnamon and Cinnamon-Buff, purest on sides and flanks with strong admixture of black on upper parts; cheeks white; arietiform markings, pinnae of ears, plantar surfaces of hind feet, dorsal and ventral stripes of tail, blackish. Skull medium in size; rostrum relatively long and narrow; nasals long and expanded distally; interorbital region narrow; lacrimal processes small; braincase but slightly vaulted; auditory bullae relatively greatly inflated; pterygoid fossae circular; zygomatic arches robust.