84 The Mammals of Colorado 
is generally at higher elevations up to timber-line or higher, for 
its workings may be seen on the grassy slopes at those high altitudes. 
Habits. — A female taken at Mud Springs, Garfield County, 
8,850 feet, July 13th, contained three small embryos; one 
taken at Garretson's Ranch, Muddy Creek, Huerfano 
County, 8,300 feet, July 14th, contained four embryos. 
Thomomys talpoides agrestis (Lat. ialpa, a mole; Lat. 
agrestis, pertaining to the fields). San Luis 
Pocket Gopher. 
Thomomys talpoides agrestis Merriam, Proc. Biol. Soc. Wash., 
xxi., p. 144 (1908). 
Type locality. — Medano Ranch, San Luis Valley, Costilla County, 
Colorado. 
Measurements. — (From Merriam /. c): Total length, 8.35; tail 
vert., 2.15; hind foot, 1.15. 
Description. — (From a specimen from type locality, taken Oct. 
26th): Above drab, with pale ochraceous cast, especially marked on 
top of head; ear spots conspicuously dusky; under parts whitish; 
chin white ; lining of cheek pouches apparently ochraceous; tail and 
feet pale gray. 
Skull proportionately rather large ; zygomatic breadth moderate ; 
interorbital breadth rather narrow; brain case triangular; bullae 
rather large ; nasals much narrower posteriorly. 
Distribution. — In travelling through the San Luis Valley by 
wagon recently I first noted gopher workings a few miles north of 
Moffat, Saguache County, and took one at that place ; workings were 
seen occasionally near the road as far south as Mosca; I went no 
farther south than that place ; workings were seen near the San Luis 
Lakes, and the species was common in the meadows at the Medano 
Ranch, the type locality. One was taken at Mosca Creek, at the 
mouth of the gulch leading up to Mosca Pass. The exact limits of 
its range are as yet unknown. It has since been taken at Cres- 
tone, Saguache County. 
Habits. — The general habits of the San Luis Gopher do not 
seem to differ from those of other species. One taken at 
Medano Ranch July 2d contained apparently four large, 
and two small embryos. Its mammae were two inguinal 
and five abdominal. 
