154 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



neck is white. The hair is scanty along the ventral surface of the 

 forearm and the proximal ends of tlie last three metacarpals. The 

 dorsum of the interfemoral membrane is furred only at the basal third. 

 The remaining characters as in A. noveboracensitt. 



The manal formula is 2-10-28-37, the difference between the third 

 and fourth interdigital interspace 18, and is much the same as in A. 

 novehoraeenfiis. 



Teeth. — The teeth, as in other species of the genus, with the exception 

 that the first premolar is smaller and slightly oval, and the second 

 premolar with a narrower V and smaller heel. 



This species is readily distinguished by the shape and small size of 

 the ear and tragus, by the attachment of the wing membrane to the 

 foot, and by the peculiarities of the premolars in both jaws, as well as 

 those of the third lower incisors. It agrees with a southern variety of 

 A. noveboracensis {A. frantii) in the partially free dorsal surface of the 

 interfemoral membrane. 



The specimen was forwarded to me by Mr. J. G. Cooper, of the Cali- 

 fornia Academy of jS^atural Science, in a bottle containing an example 

 of A. noveboracensis, and it resembles this form so closely in coloration 

 that at first I mistook it for an immature example of the species last 

 named. The specimen is in poor condition. After decomposition had 

 set in it had been preserved for a long time in strong alcohol. 

 Habitat. — Unknown, but is probably southern California. 



Measuremenis. 



Millimeters. 



Head and body (from crown of liead to base of tail) 38 



Length of arm 22 



Length of forearm 37 



First digit : 



Length of first metacarpal bone 2 



Length of first phalanx 4 



Second digit : 



Length of second metacarpal bone 40 



Length of first phalanx - 6 



Third digit : 



Length of third metacarpal bone 40 



Length of first ](halanx 14 



Length of second phalanx 15 



Fourth digit : 



Length of fourth metacarpal bone 38 



Length of first phalanx 10 



Length of second phalanx 8 



Fifth digit : 



Length of fifth metacarpal bone 32 



Length of first phalanx 7 



Length of second phalanx 7 



Length of head 12 



Height of ear from head 4 



Height of ear from base of external lobe to tip 6 



