Bats 
283 
British Columbia and the southeastern United States to 
southern Mexico. The genus contains one species, which 
is subdivided into three subspecies, one of which has been 
taken in Colorado. 
Corynorhinus macrotis pallescens (Grk. makros, large 
+ Otis, ear; pallescens, Lat. to grow pale). Pale 
Big-eared Bat. 
Corynorhinus macrotis pallescens Miller, N. A. Fauna, No. 13, 
p. 52 (1897). 
Type locality. — Keam Canon, Navajo County, Arizona (A. K. 
Fisher, Aug. 3, 1894). 
Measurements. — Total length, 3.85; tail vert., 1.8; hind foot, 0.4; 
ear from notch (dried skin), i.i; forearm, 1.65. Length of skull, 
0.6 ; width, 0.35. 
Description. — (From a specimen taken at Oro Grande, California, 
March 15th. B. S. No. 136, 230) : Above pale, somewhat yellowish 
brown, lighter on head; under parts much paler, grayish rather 
than brown; ears and membranes light brown. 
Cranial and dental characters as for genus. 
The very large ears distinguish it from all our other bats, except 
A. pacificus, and they are larger than those of that species, besides 
being close together at the base. 
Distribution. — Probably throughout the Austral zones from 
California, Colorado, and western Texas to Southern Mexico 
(Miller, I. c). He reports it from Larimer County. Other Colorado 
records are Trinidad (Beardsley) ; Fort Collins (Johnson) ; Crisman, 
Boulder County, 7,000 feet (Henderson). 
Genus ANTROZOUS (Grk. antron, a cave + zoon, animal) 
Antrozous H. Allen, Proc. Acad. Nat. Sci. Phila., p. 247 (1862). 
Type, Vespertilio pallidus LeConte. 
Revision, Miller, A^. A. Fauna, No. 13 (1897). 
Muzzle squarely truncate, with low but distinct horseshoe 
shaped ridge above nostrils; behind this a large flattish swelling 
on each side. Ears separate, but large, wide apart at base, extend- 
ing considerably beyond tip of muzzle when laid forward; tragus 
long and slender, straight. Skull with rather high smooth brain- 
case, deep interorbital region, and large rostrum, the dorsal profile 
with no special concavities or convexities. Dentition, i. |; c. \\ 
pm. ■j;m. f X 2 = 28; teeth large and strong; upper premolar 
