62 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



nal basil ridge extends nearly the entire len<;tli of the auricle. Exter- 

 nal border simple, entire, without scallops. The external basal lobe 

 well defined, sini])le, not recurved, hairy on outer surface. Auricle 

 greatly constricted opposite base of tragus, to wliicli it is attached; no 

 external basal ridge. Tragus elongate, but scarcely narrowed at tip, 

 little more than one-third the length of the auricle, straight or slightly 

 convex on inner border, moderately convex on outer border; basal 

 notch shallow, indeterminate; no basal lol^e. Muzzle simple, depressed 

 in middle; glands on the side rudimental, not club-shaped; nostril 

 entire oval, without cornu. 



The auricle is marked with numerous transverse striie at <mter two- 

 thirds excluding the tip. The inner ])order and tip fringed with short 

 hair, a sparse growth occupies the inner surface of the auricle from the 

 inner border of the internal basal ridge. 



Alenibranes. — The thumb disposed to be Hexed, the membrane extend- 

 ing to the base of the first jdialanx. A distinct hem extends between 

 the thumb and sec<md digit. Tlie second digital int('rsi)ace 3'^"" 

 wide. Metacarpal bones distinct on palmar aspect. I'almar folds at 

 fifth metacarpal two in number. The terminal cartilage of the fourth 

 digit axial. Foot one-seventh of the length of the forearm. Tail as 

 long the forearm, tip exsert. 



The markings on the membranes are as follows: In the fourth inter- 

 space the predigital nerve arises midway along the fifth metacarpal and 

 the post digital from the distal fourth of the fourth meta:cari)al bono. 

 Oblique tibial lines four in number. The interfemoral membrane e; - 

 tire, ample, marked by ten well-defined C()m])lete transverse lines. In- 

 tercostals twelve in number, ranging obli(iuely outward and upward. 



Fur. — Black and white hues arranged in a manner unique in Chei- 

 roptera. Dorsum with fur of a prevailing black, the hair being uni- 

 formly long and unicolored, excepting at the base of the ears, over the 

 shoulder blades, and at the rump, wbere the hair is white. The clumps 

 on the ear are unicolored ; those on the shoulder blades have hair with 

 basal half black; that on the rump is intermingled with black, but 

 otherwise the hair is as on the shoulder blades. The nape of the neck, 

 crown, and base of the ears, where they join the crown, of a more rusty 

 black than that of the dorsum generally. This arrangement is limited 

 by the low band which unites the ears; the face is sparsely covered 

 with blackish hairs; the lips at the sides are whiskered; the spaces 

 about the eyes are naked. The under surface of the body with white 

 as its prevailing color, the basal portion of \\\e fur everywhere being- 

 black, excepting where the large ear extends down on the side of the 

 jieck. In this region (viz the upper half of the neck) the hair is pure 

 white and unicolored and continuous above with the basal ear clumps. 

 The lower half of the side of neck is black throughout. A faint white 

 line extends across the shoulder to unite the clumps on the shoulder 

 Ijlades to that of the ventre. The fur otherwise black at basal two- 



