114 



NORTH AMEEICAN FAUNA. 



[no. 39. 



SIcuU. — Heavier and wider than in Jossor, with heavier dentition, 

 smaller bullae, a more nearly five-angled interparietal, and wider 

 nasals with deeply emarginate instead of rounded posterior tips. 



Measurements. — ^Average of type and topotype ( ad.): Total 

 length, 226; tail vertebrae, 70; hind foot, 31. Topotype ( ? ad.) : 211, 

 64, 28. Slcull (of type): Basal length, 35; nasals, 13; zygomatic 

 breadth, 23; mastoid breadth, 21; alveolar length of upper molar 

 series, 8. 



Remarks. — While very similar to its nearest relative, fossor, in 

 external characters, uinta has such pronounced skull characters and 

 is so widely separated that it is best treated as a full species. It also 

 has the same boreal, mountain habitat and practically the same 

 environment and habits as Jossor. Specimens from the mountains 

 of western Wyoming show some local variation but not sufficient 

 to be recognized as a subspecies. There seems to be no evidence 

 of intergradation with the smaller and smaller-eared fuscus group, 

 although they come close together in the region south of Jackson 

 Hole, Wyo. 



Specimens examined. — Total number 110, as follows: 

 Idalio: Albion, 5; Blackfoot (hills east of town), 1; Bridge, 1; Inkom, 12; Irwin 

 (10 miles southeast), 7; Malade, 6; Pocatello, 4; Preuss Mountains, 5; Shelley, 

 3; Swan Lake, 4. 



Utah: Kelton (mountains 7 miles north), 3; Ogden, 6; Park City, 3; Parley 

 Canyon, 1; Uinta Mountains (9,000-10,000 feet altitude), 6. 



Wyoming: Afton, 7; Afton (10 miles southeast, in Salt River Mountains), 6; 

 Afton (10 miles north on Salt River), 7; Black Rock Creek (head, in Shoshone 

 Mountains), 5; Kendall (12 miles north), 6; Mema, 6; Needle Mountain 

 (10,000 feet altitude), 4; Stanley (3 miles west), 1; Thayne, 1. 



THOMOMYS QUADRATUS QUADRATUS Merriam. 

 Dalles Pocket Gopher. 

 (PI. vn, fig. 8.) 



Thomomys quadratics Merriam, Proc. Biol. Soc. Washington, XI, 214, July 15, 1897. 



Type. — Collected at The Dalles, Oregon, by Clark P. Streator, 

 November 2, 1893. Type specimen in U. S. Nat. Mus., Biological 

 Survey collection. 



Distribution. — Plains of eastern and central Oregon, northeastern 

 California, and northwestern Nevada (fig. 5). 



Characters. — Smaller than uinta; rather brighter colored; ears small; 

 skull relatively short and wide, with wide, truncate, posterior tip of 

 nasals; mammge in 5 pairs, inguinal 2-2, pectoral 3-3. 



Color. — Summer pelage: Upperparts light russet; ear patch black; 

 nose dark plumbeous; underparts washed with dark buff; tail 

 brownish above, except at tip; feet whitish. Winter pelage: Duller 

 and grayer. Young, dull and rather dark. 



