134 ORDER III. 



nura and Urocryptus form two small groups be- 

 tween Taphozous and the true bats. 



Genus NYCTICEJUS, Rafin. Roquet-dog Bats. 

 Dent. form, incis. f , can. \-\, mol. -f^ = ^f = 30. 

 But there are sometimes two incisors and two pre- 

 molars more above, making the dentition vary to 

 thirty-two and even to thirty-four ; the ears are 

 small ; muzzle simple ; chaffron very broad ; fore- 

 head narrow ; occiput elevated ; interfemoral mem- 

 brane pierced by the tail, which is usually long. 

 Is found on all the continents, Europe excepted. 

 They form two groups, one belonging to the Old 

 World, the other to the New ; the first with close 

 smooth fur, some species partially naked, more espe- 

 cially on the abdomen, croup, and thighs. Form A, 

 section 1, contains seven species from Africa, India, 

 the Islands, and Bourbon. 



B, section 2, forming the American group, have 

 the fur usually longer, and the interfemoral mem- 

 brane clad more or less with hair : among these is 

 the New York Bat of Penn., Nyct. Noveboracensis, 

 and three others, besides some species of the interior 

 of the United States described by Rafinesque, and 

 his genus ATALAPHA depends solely upon an old 

 Nycticejus without its incisors. 



Genus VESPERTILIO, Linn. Bats Proper. Dent, 

 form, incis. , can. J-J, mol. ^ = ^f =32. But, 

 according to the number of premolars, 34, 36, and 

 even 38 ; the tail is invariably included within the 

 membrane; nose without leaf, ridges, or tubes; the 



