Tornillo Deer-Mouse 
133 
Habits. — The habits of the species are, as far as is known, 
so similar to those of the two preceding as to need no special 
description. 
Peromyscus leucopus tornillo (Grk. leukos, white, + 
pous, foot, white-footed; tornillo, for the ''tornillo " or 
screw bean, among the forests of which it often lives in 
Texas). Tornillo Deer-Mouse. 
Peromyscus tornillo Mearns, Proc. U. S. N. M., xviii., p. 445 
(1895). 
Type locality. — Rio Grande Valley, 6 miles above El Paso, Texas. 
Measurements. — Total length, 7.1; tail vert., 3.2; hind foot, 0.82. 
Description. — (From a specimen taken at Lamar, April 8th): 
Above, dark brown, paler and brighter on sides, darkest on the 
dorsal region, where a certain amount of black hairs are intermixed. 
Upper part of tail like back. Feet and underparts white. Easily 
distinguished from any of preceding by larger size. 
Distribution. — The Tornillo Deer-mouse has been taken in western 
Texas, New Mexico, Arizona, and Colorado, also in northeastern 
Mexico. In Colorado it is at present known only from Lamar, 
Prowers County, Monon and Springfield, Baca County, while 
a single specimen from Gaume's Ranch, in the northwest corner of 
Baca County was also identified by Osgood as this species, though 
it seems very like the Nebraska Mouse, which was very common 
there; the Biological Survey also has specimens from Caiion City. 
Habits. — The habits seem to be similar to those of the 
species already described. At Lamar it was taken about 
brush heaps in the Arkansas River bottom, and in the Baca 
County localities it was found living around the rock ledges 
in the Bear Creek valley. At Monon some were also taken 
at deserted ranch buildings. 
The number of young varies from four to six. 
Peromyscus crinitus auripectus (Lat. aureus, golden, + 
pectus, breast). Golden-Breasted Deer-Mouse. 
Buff -Breasted Cafion Mouse. 
Siiomys auripectus Allen, Bull. Am. Mus. N . H., v., p. 75 (1893). 
Type locality.— Bluff City, San Juan Co., Utah. 
