16 ZOOLOGY OF THE VOYAGE OF THE SULPHUR. 



litate their discrimination, and to point out what I believe to be the proper 

 locality of the new genera. 



The genera of this tribe may be divided into natural sections in the fol- 

 lowing manner : — 



I. The ears close together over the forehead ; forehead with a rather deep pit ; 

 nose-leaf lanceolate, erect. Tail elongate, produced beyond the interfemoral 

 membrane. Wings from the ankle ; lower joint of thumb moderate. India and 

 Africa. 



Rhinopoma, Geoff. 



II. The ears large, united together by a transverse membrane over the fore- 

 head ; forehead simple, convex; nose-leaf large, erect. Tail none; interfemoral 

 membrane and wings large ; wings from the foot ; lower joint of thumb elongate. 

 India and Africa. 



Megaderma, Geoff. The nostrils simple. India. 



Lavia, Gray. The nostrils each covered by a membranaceous, valvular, lon- 

 gitudinal ridge. Africa. 



III. The ears large, united together by a transverse membrane over the fore- 

 head ; forehead simple, convex ; nose-leaf lanceolate, erect ; chin with a deep nar- 

 row groove. South America. 



Macrotus, Gray. Interfemoral membrane large, truncate; tail elongate, 

 produced beyond the membrane. Hayti. 



IV. The ears separate, on the side of the head; the forehead simple, convex ; 

 the nose leaf lanceolate, erect ; the chin with a narrow, deep, triangular groove in 

 front ; tongue elongate ; face elongate. South America. 



Phyllophora, Gray. Interfemoral membrane large, truncate. Tail short, 

 enclosed ; apex superior. 



Glossophaga, Geoff. Interfemoral membrane deeply cut out ; tail none. 



Anoura, Gray. Interfemoral membrane very narrow, margining the legs ; 

 tail none. 



Monophyli.us, Leach. Interfemoral membrane distinct, deeply cut out; 

 tail short, inclosed ; apex superior. 



V. The ears separate, on the side of the head ; forehead simple, convex ; the 

 nose leaf lanceolate, erect ; chin with a broad triangular bald space in front ; face 

 and tongue moderate. South America 



Macrophyllum, Gray. Interfemoral membrane large, truncated ; tail elon- 

 gate, inclosed, extending to the edge of the interfemoral membrane. Wing from 

 the upper part of the ankle. 



Vampyrus, Geoff. The interfemoral membrane large, truncated, with three 

 diverging lines; tail none; face rather elongate. Wing from the base of the toes. 



