26 



NORTH AMERICAN BATS. 



Dentition. 



4 1.2 

 Molars — • Canines — Incisors — . 



5 1 (J 



Canines 



Molars _ = 30 teeth. 

 5 



The small premolar placed behind the canine of the upper jaw 

 of L. cinereus and L. noveboracen^is is here absent. 



This species in size, physiognomy, number of incisors, and 

 character of the distribution of the fur resembles the type of 

 La.nurus, while in shape of the ears and disposition of molars it 

 is akin to Scotophilus. The interfemoral membrane is scarcely 

 more hairy than in S. noctivagans, yet the entire contour of the 

 animal is strongly Lasiurian. It is intermediate between L. 

 grayi, Tomes, and L. cinereus, Pal. de Beauvois. It is larger 

 than L. grayi, and smaller than the majority of specimens of L. 

 cinereus; the thumb is small as in the former, but the wing mem- 

 brane extends to the base of toes as in the latter; it is distinct 

 from both in the brown fur, in the high ear and the scantiness 

 of the hair on the interfemoral membrane. 



Measuremexts. 



List of Specimens. 



