284 The Mammals of Colorado 
transversely long and narrow ; first lower premolar small and closely 
wedged between canines and second premolar. 
Among American VespertilionidcB this genus is at once 
recognizable by the form of the muzzle. The known 
species are all of large size for the group, and their color is 
a characteristic pallid tawny. 
The genus is found in the warmer parts of western North 
America, from Texas to the Pacific coast, and from the 
Columbia River to Central Mexico. Of the three known 
forms one has been taken in southern Colorado. 
Antrozous pallidas. Pale Bat 
Vespertilio pallidus LeConte, Proc. Acad. Nat. Sci. Phila., vii., p. 
437 (1854-55)- 
Type locality. — El Paso, Texas. 
Measurements. — Total length, 4.4; tail vert., 1.75; hind foot, 0.4; 
ear from notch, dried skin, 0.9; forearm, 2. Length of skull, 0.75; 
width, 0.5. 
Description. — (From a specimen taken in Montezuma County, 
June 21, 1903): Hairs above very pale yellowish, almost white, 
and tipped with pale brown ; under parts grayish white ; ears similar 
to back; membranes blackish. Skull and cranial characters as 
for genus. 
The only Colorado species likely to be confused with it is Coryno- 
rhinus m. pallescens, and the much paler color and smaller ears of the 
present species besides the cranial and dental characters distinguish 
it. 
Distribution. — Desert region of eastern California, Nevada, 
Arizona, New Mexico, southern Colorado, and western Texas. 
There are two records from Colorado, Pueblo (Coues and Yarrow), 
and Ashbaugh's Ranch, Montezuma County (Cary). 
Family MOLOSSID^ 
Insectivorous Bats with simple nostrils at the end of the 
muzzle; ears variable in size and form, sometimes joined 
across the forehead, tragus much reduced, antitragus large; 
first phalanx of the middle finger in repose folded on the 
