144 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



Description. — Ears shorter tliau Lead ; less rouuded tlian in A. cin- 

 erea.* While anterior border is convex the posterior is slightly con- 

 cave between the tip and couch and minutely revolute. The internal 

 basal lobe is wider than high, lower border horizontal, posterior end 

 free and projecting back of the base of the keel (int. basal ridge). The 

 keel is stout and conspicuous. The external basal ridge defined. A 

 narrow hem confined to the region of the shallow notch which it entirely 

 occupies. The external basal lobe rouuded not incurved or thickened; 

 a distinct notch at the base anteriorly. The tragus nearly half as 

 high as the auricle. Anterior border nearly or quite straight, tip 

 rounded and produced forward. The greatest width equals one-half 

 the height. The basal lobe is conspicuous; above it lies a long shallow 

 notch, the upper border of which forms a minute tubercle; above this 

 the border is convex but tapers abruptly toward the apex. The tragus 

 is marked by a transverse ridge, which, however, does not extend en- 

 tirely across the outer surface. 



The muzzle is flat or concave, and projects slightly beyond the lower 

 lip. The nostril near the upper lip with septum touching the outer 

 wall. The simple chin plate not bound to the gum nor defined at the 

 sides, but continues with the border of the lower lip. It is apt to be 

 more conspicuous in the female and have a sharply limited lower border. 



The calcar is bony in adult forms. It often ends by a small distinct 

 lobe. The post calcaneal lobe is often absent. The wing- membrane is 

 attached to the base of the toes. White spaces occupy the side of the 

 fourth and fifth metacarpal bones. Numerous minute spots are dis- 

 persed over the third and fourth digital interspaces. 



The fur is everywhere soft, luxuriant, and more brilliant in coloring 

 than in any other species in the fauna. Above the general ettect is of a 

 russet red color with occasional shades of brown, fawn, dull buff, or gray. 

 The hair of the body is everywhere black at the basil third, followed 

 by a bright, broad band of light buff" (gold or yellow); then follows a 

 subtip of the characteristic hue of red or its variant, the extreme tip 

 of the hair being often gray, especially toward the sides of the body. 

 The hair is relatively short on the head and neck, and longer on the 

 back of the chest, side of the neck, and over the loin. The ears are 

 covered at the basal two-thirds with fine unicolored hair of the same 

 hue as that of the head; thus the color of the back (at the ear) is 

 brought around to the side and even to the front of the neck. The in- 

 terfemoral membrane is completely covered in the majority of speci- 

 mens with hair which is slightly woolly in texture and is without the 

 black base and buff of the shaft that is so conspicuous in the hair of the 

 body. The wing membrane is covered with hair from a i>oint midway 

 from the elbow to the ankle. Like that on the interfemoral membrane, 



*In the drawing of the head by M. Duges, pi. xxvii fig. 2 the ears are represented 

 as bordered Tty a broad dark margin. Nothing similar to this has been observed by 

 me in the study of the alcoholic specimens. 



