46 The Mammals of Colorado 
front border and tip ; inside of ears grayish white ; front and outside 
of fore legs, and back and outside of lower hind legs, rusty rufous, 
the hind legs being paler and more cinnamon. 
The posterior portion of the postorbital process is quite wide, 
and lies close to the skull, leaving but a small foramen; the ante- 
rior end is very short, making only a small notch with the skull; 
the bullae are rather small and smooth. 
The only species whose range adjoins and overlaps that of this 
species is baileyi, and the broader postorbital process, with small for- 
amen, smaller bullae, shorter ear, and darker, brighter nape and 
pectoral band serve to distinguish it. 
Distribution. — This species is found in extreme western Minne- 
sota, eastern North and South Dakota, Nebraska, northern Kansas, 
and northeastern Colorado. Its distribution in Colorado is not as 
yet very well known; it is found along the Platte River and its 
tributaries to the base of the mountains near Denver, and has been 
taken at Dry Willow Creek, near Wray, Yuma County; Orchard, 
Morgan County; Barr, Adams County; Arvada, Jefferson County; 
Littleton, Arapahoe County; and Masters, Weld County. 
Habits. — ^The habits of the various species of Cottontails 
r " ^ 
FIG. 14. YOUXG COTTONTAIL RABBIT! SylvilagllS SP. 
Frightened, and crouching on the ground. Robt. B . Rockwell, Photo. 
are very much ahke in a general way, and may vary quite 
a little with the same species, according to its surroundings. 
