50 The Mammals of Colorado 
Type locality. — Spring Creek, east side of Bighorn Basin, Wyoming. 
(Sept. 7, 1893, by C. Hart Merriam and Vernon Bailey.) 
Measurements. — Total length, 15.5 ; tail vert., 2.2 ; hind foot, 3.7 ; 
ear from notch, 2.75. 
Description. — (From a specimen taken near Colorado Springs, 
Nov. 7th.) Above, pale pinkish buff, mixed with black posteriorly ; 
rump grayish, mixed with black ; upper part of tail mixed gray, buffy, 
and blackish ; sides grayish buffy ; upper sides of front feet pale 
ochraceous buff ; back and sides of hind legs similar but somewhat 
darker; nape pale rufous; pectoral band pale pinkish buff; rest of 
underparts white. A specimen taken June 29th, five miles west of the 
Snake River, Routt County, is in an intermediate stage of pelage, 
having moulted most of the old coat, but the new coat is short, 
FIG. 16. WYOMING COTTONTAIL, SylvUagus a. baileyi 
Dorsal view of skull x i\ 
not having attained its full length. The whole back is brownish 
with white and gray-tipped hairs, little or no black, and the sides 
are a clearer gray, while the nape is a clearer, brighter rufous. The 
colors of this form vary considerably with locality, individuals, and 
season. 
In the skull the postorbital process is rather broad posteriorly and 
encloses a well-marked oval foramen; the anterior portion is fairly 
long, and makes a deep notch; the bullae are moderate in size and 
rather rough. 
Distribution. — The Wyoming Cottontail is found in eastern 
