Subspeciation in the Kangaroo Rat, Dipodomys ordii / KU. Vol 1 No 23

by Henry W. Setzer

From Dipodomys ordii columbianus, D. o. celeripes differs in: Size smaller; color lighter; rostrum wider and shorter; interorbital width less; interparietal region wider; auditory bullae, generally, less inflated; upper incisors longer and more robust; pterygoid fossae larger.

For comparisons with Dipodomys ordii fetosus, Dipodomys ordii pallidus and Dipodomys ordii panguitchensis see accounts of those subspecies.

Remarks.—It appears that wherever the range of D. o. celeripes meets that of an adjoining race, intergradation occurs freely. Practically all of the Nevadan specimens referable to this subspecies are intergrades with Dipodomys ordii columbianus in size and color. Specimens from west of Delta, Utah, are intermediate in size between Dipodomys ordii pallidus and D. o. celeripes but their cranial characters are more as in D. o. celeripes. Intergrades with Dipodomys ordii utahensis are discussed under the account of that subspecies.

The characters differentiating D. o. celeripes from any contiguous subspecies are not present in every specimen even in the type series.

Specimens examined.-Total, 96, distributed as follows:

Nevada: Elko County: 13 mi. N Montello, 5000 ft., 2 (MVZ); 1-1/2 mi. N Tecoma, 4900 ft., 6 (MVZ); Tecoma, 4900 ft., 8 (MVZ); Cobre, 6100 ft., 3 (MVZ); Salt Springs, 4200 ft., 1 (MVZ). White Pine County: 2 mi. W Smith Creek Cave, 6300 ft., Mt. Moriah, 2 (MVZ); Hendry Creek, 8 mi. SE Mt. Moriah, 6200 ft., 1 (MVZ).

Utah: Tooele County: Clifton Flat, 7 mi. SW Gold Hill, 6149 ft., 4 (UU); Parrish Ranch, 5 mi. N Ibapah, 5175 ft., 1 (UU); Ibapah, 5000 ft., 23 (UU). Juab County: Trout Creek, 4600 ft., 21 (19 UU; 1 USAC; 1 MVZ); 20 mi. SW Nephi, 2 (UU); U. B. (Yuba) Dam, Sevier River, 5000 ft., 10 (UU). Millard County: 4 mi. S Gandy, 5000 ft., 1 (MVZ); Smith Creek, 6 mi. S Gandy, 5400 ft., 2 (MVZ); Hendry Creek, 5000 ft., 17 mi. S Gandy, 4 (MVZ); Oak City, 5000 ft., 1 (UU); White Valley, 60 mi. W Delta, 1 (UU); 35 mi. W Delta, 1 (UU); East side Clear Lake, 4600 ft., 4 (3 UU; 1 USAC); 2 mi. E Clear Lake, 4600 ft., 2 (UU).

Dipodomys ordii cineraceus [Goldman]

Dipodomys ordii cineraceus [Goldman], Journ. Mamm., 20:352, August 14, 1939.