Goose Creek, and Grouse Creek mountains. In addition to extending the known area of occurrence of this animal in Utah, these specimens prove also that this species is not restricted to the Snake River Drainage as Durrant (1952:113) supposed, but occurs also in the Great Basin Drainage.

Citellus richardsonii elegans (Kennicott). Richardson Ground Squirrel.—Recently, Hansen (1953:132) reported on specimens of this species from Rich and Summit counties. Additional specimens are now available from Highway 165 [2 mi. E Summit—Daggett Co. Line], 2 miles south of Utah-Wyoming State Line; 5 miles west of Manila, and one mile northeast of Manila (Carnegie Museum). These localities are in Daggett County. The occurrence of these ground squirrels in Rich, Summit and Daggett counties suggests that they occur along the entire northern piedmont of the Uinta Mountains.

Citellus lateralis trepidus (Taylor). Golden-mantled Ground Squirrel.—Durrant (1952:126) estimated that practically all of the area in Utah that is within the Great Basin might be included in the range of this subspecies. Actually, he had specimens from only the Raft River Mountains in northwestern Boxelder County. He included sight records from the Deep Creek Mountains and from the Oquirrh Mountains. Subsequently two specimens, numbers 7469A and 7470A, were obtained from the Deep Creek Mountains. To date neither specimens nor subsequent sight records have been obtained from the Oquirrh Mountains, and we are of the opinion that Durrant erred, and that the golden-mantled ground squirrel does not inhabit these mountains. Therefore, it seems at this writing that this subspecies, in Utah, occurs only in the extreme western and northwestern parts of the state in the Deep Creek and Raft River mountains, and not within the basin of Pleistocene Lake Bonneville as formerly supposed.

Eutamias umbrinus umbrinus (J. A. Allen). Uinta Chipmunk.—Two specimens, numbers 10,236 and 10,237, from the junction of Argyle and Minnie Maud creeks, Carbon County, prove that members of this subspecies occur on the West Tavaputs Plateau, which is outside the range ascribed to this subspecies by White (1953:572) and by Durrant (1952:142). The grayish color of these specimens and the reduction of ochraceous pigments constitute basis for referring the specimens to E. u. umbrinus, and not to E. u. adsitus or E. u. montanus. E. u. umbrinus on the West Tavaputs Plateau is separated from E. u. montanus on the East Tavaputs Plateau by the Green River and its deep chasm.

Perognathus formosus incolatus Hall. Long-tailed Pocket Mouse.—Prior to the description of this subspecies by Hall (1941:56), animals of this species had not been reported from within the basin of the Pleistocene Lake Bonneville. When Durrant (1952) prepared his manuscript he had but a single specimen from western Millard County and one nearby record (Fautin, 1946:280). Additional specimens are known from the following localities: junction of Trout Creek and Birch Creek, Deep Creek Mountains, Tooele County; six miles north of Ibapah, Tooele County; five miles south of Timpie, Tooele County; north end of Newfoundland Mountains, Boxelder County; and Groome, Boxelder County. These occurrences show that the species is not restricted to the extreme western part of the state, but occurs in suitable habitats throughout the basin of Pleistocene Lake Bonneville. The known range is extended approximately 150 miles north and 40 miles east.

Perognathus parvus trumbullensis Benson. Great Basin Pocket Mouse.—Durrant (1952:477), suspecting that this mouse occurred in Utah, included the subspecies P. p. trumbullensis in his hypothetical list. Numerous specimens are now available from the following localities: Pine Valley Mountains, Enterprise Reservoir, and 19 miles west of Enterprise, Washington County; Bown's Reservoir,