112 



NOETH AMEEICAN FAUNA. 



[no. 39. 



Colorado: Arapahoe Pass (Rabbit Ear Mountains), 5; Black Hawk, 2; Baxter 

 Pass (Book Plateau), 2; Boulder (5 miles west, at 5,600 feet altitude), 7; 

 Cascade, 1; Cochetope Pass (3 miles east), 5; Colorado City, 1; Colorado 

 Springs (2J miles north, at 6,000 feet), 1; Colorado Springs (east of Palmer 

 Park), 1; Como, 1; Coulter, 3; Crested Butte, 4; Culebra Canyon (Costilla 

 County), 1; Elk Head Mountains, 2; Elkhorn, 1; Estes Park, 6; Florida, 5; 

 Golden, 2; HahnsPeak, 2; Hayden, 1; Lake City, 2; Longs Peak, 3 ; Meeker, 

 3; Montgomery, 3; Nederland, 4; Pagosa Springs, 3; Pagosa Peak, 1; Pearl, 

 1; Saguache (23 miles northwest), 1; Sapinero, 2; Silverton, 2; Uncom- 

 pahgre Plateau, 2; Teller County Divide, 1; White River Plateau, 1. 



New Mexico; Chusca Mountains, 3; Costilla Pass, 5; Costilla River, 3; Gallinas 

 Mountains (Rio Arriba County), 7; Halls Peak, 1; Hondo Canyon, 1; Hope- 

 well, 6; Horse Lake, 6; Jemez Mountains (head of Santa Clara Creek), 5; 

 Moreno Valley, 2; Mount Taylor, 1; Pecos Baldy, 4; Red River (Taos 

 County), 4; Taos Mountains, 4; TresPiedras, 1; Tusas River, 1; Twining, 12; 

 Whites Peak, 1; Willis, 4. 



Utah: Beaver Mountains, 9; Buckskin Valley, 1; Fish Lake, 4; La Sal Moun- 

 tains, 1; Panguich Lake, 1; Parawan Mountains, 4. 



Wyoming: Bridgers Peak (8,800 feet altitude), 3; Medicine Bow Mountains 

 (10,200 feet), 1. 



THOMOMYS BRIDGERI Merriam. 

 Fort Bridger Pocket Gopher. 



(PL VII, fig. 15.) 



Thomomys bridgeri Merriam, Proc. Biol. Soc. Washington, XIV, 113, July 19, 1901. 



Type. — Collected at Fort Bridger, Wyoming (exact locality, Har- 

 vey's Ranch on Smiths Fork, 6 miles southwest of Old Fort Bridger), 

 by Vernon Bailey, May 27, 1890. Type specimen in U. S. Nat. 

 Mus., Merriam collection. 



Distribution. — Southwestern Wyoming and southeastern Idaho 

 (Transition Zone) (fig. 5). 



Characters. — Size large; ears large and prominent; color dull dark 

 brown; skull heavily ridged and angular, with deeply emarginate 

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



Color. — Summer pelage: Upperparts rich warm brown, nearest 

 to cinnamon-brown of Ridgway; nose and face dusky brown; large 

 ear patch black; underparts dark buffy or dull ochraceous, occa- 

 sionally with white patch on chin; feet partly gray or mottled with 

 gray; toes whitish; tail brownish gray, paler below and occasionally 

 with white tips. Winter pelage: Upperparts duller and darker, more 

 nearly Front's brown of Ridgway; nose plumbeous, ear patch black; 

 underparts washed with buffy over light plumbeous, with almost a 

 lavender effect. Young more grayish. 



Slcull. — Large, angular, and heavily ridged in adults; nasals long 

 and deeply emarginate at posterior tips; temporal ridges parallel 

 or slightly converging in middle; interparietal triangular; audital 

 bullae long, narrow, and wide apart, with wide shaft of basioccipitai 



