ARTIFICIAL KEY TO THE GENERA. 



I. ISTIOPHORA. 



(Bats with upright appendage on nose.) 



M EG ADERMATIDiE. 



Nose leaf simple, triangular, acuminate. . . Macrotus. 



II. Gymnorhina. 



(Bats without upright appendage on nose.) 



A. Nostrils circular ; wing membranes narrow ; 



tail either much longer or much shorter 

 than interfemoral membrane . . . Noctilionid^. 

 Lips grooved Nijctinomus. 



B. Nostrils subelliptical ; wing membranes am- 



jjle; tail inclosed in interfemoral mem- 

 brane — the final joint in some instances 

 exserted Vespertilionid^. 



a. Two incisors in tipper jaw. 



•j- Six incisors in lower jaw. 



* Interfemoral membrane more 



or less liairy . . . Lasiurus. 



** Interfemoral membrane not 



hairy . . . 4 Nycticejus. 



X Four incisoi.-, in lower jaw . . Antrozous. 



b. Four incisors in upper jaw. 



I Molars | ; internal basal lobe of 



ear acute . . • • Vespertilio. 



X Molars less than « ; internal basal 

 lobe of ear rounded. 



* Nose with two symmetrical 



excrescences . . • Synotus. 

 ** Nose without excrescences . Scotophilus. 



( xxiii ) 



