18 FAUNA AMERICANA. 



CHARACTERS. 



1. Vespertilio, Linn. 



/r Incisor 4. 

 superior 18. < Canine 2. C false molai's 6. 

 (.Molar 12. ? true molars 6. 

 r Incisor 6. 

 l_ inferior 20. < Canine 2. C false molars 6. 

 C Molar 12. t true molars 6. 



2. Vespertilio, Desm. 



r Incisor 4. 



r superior 14 or 16. < Canine 2. 



_ , I- 1 no o,- i ii_ J C Molar 8 or 10. 



Dental formida.— 32 or 36 teeth. ^ r incisor 6. 



I. inferior 18 or 20. s Canine 2. 



CMolar 10orl2. 



Superior incisors separated into pairs, cylindri- 

 cal and pointed ; inferior approximate with bilo- 

 bate edges inclined and directed forwards. 



Canines moderate, and not touching at base. 



Anterior molars simply conical ; the posterior 

 with broad crowns and tuberculated points ; the 

 inferior grooved on the sides ; the superior twice 

 as large, having an oblique cutting crown. 



Nose not foliated, nor grooved, nor w rinkled, 

 nor operculated over the nostrils. 



Lower lip simple ; tongue smooth, not protrac- 

 tile. 



Ears more or less large, with an auriculum. 



Wing-membranes very extensive, and measur- 

 ing in spread, four or five times the total length 

 of the body. 



Index finger having only one phalanx ; middle 

 finser three, annular and little finger two. 



