16 FAUNA AMERICANA.' 



sors in very variable numbers ; canines more or 

 less strong ; crowns of the molars sometimes tu- 

 berculated, sometimes grooved lengthwise ; a fold 

 of skin extended between the four extremities, 

 and between the fore-fingers. 



Two pectoral mammae; penis of the male free; 

 powerful clavicles, scapulae broad ; fore-arm not 

 susceptible of pronation or supination. 



Tribe, Vespertilio. 



Char. Fore-fingers excessively elongated, and 

 supporting a very fine membrane, with the thumb 

 only separate, not opposable. 



Incisors, canine, and molars easily distinguish- 

 able by their forms ; membrane naked both above 

 and below. 



Genus. 



Rhinopoma, Geoff. 

 Vespertilio, Belon, Brimich. 



CHARACTERS. 



Dental formula.— Teeth 28 



C Incisor 2. 

 superior 12. < Canine 2. 

 C. Molar 8. 

 C Incisor 4. 

 l^ inferior 16. < Canine 2. 

 C Molar 10. 



/ 



Superior incisors separate from each other; 

 nose long, conical, truncated at the extremity, and 

 surmounted by a small membranous fold ; nostrils 

 narrow, transverse and operculated, broad and 

 concave above ; ears large, approximate and fall- 



