NTOTICEJUS. ] 1 



Fam. VESPERTILIONIDiE. 



NYCTICEJUS, Raf. 



Nycticejus, Raf., Journal de Physique, LXXXVIII, 1819, 417. 



Head short, broad, flat ; ears small, simple, widely separated ; 

 upper incisors two ; membranes naked. 



Fig. 9. 



N. crepuscularis. 



Skull. — Intermediate between that of Scotophilus and that of 

 Lasiurus, flat, but not to the extent seen in the former ; cranium 

 inflated, but not so much as in the latter. It is not elevated ; the 

 occipital elevation is not abrupt. Compared with that of L. 

 noveboracensis, a bat of nearly the same size, it is longer, and 

 face more pointed. The palate is more level and does not slope 

 so much at its posterior part. The infraorbital foramen is lai'ger, 

 with a slight tendency toward the formation of a groove. The 

 lower jaw is less abrupt ; the incisors are placed more anteriorly 

 to the canines in a larger arc. 



Dentition. 



Molars — Canines — . Incisors — . Canines — . Molars. 30 teeth. 



5 1 6 1 5~ 



Upper Jaw. — Incisors small, contiguous to canines, and slightly 

 converging ; canines large, simple. Molars not peculiar. The 

 first more slender and longer than the others, but not so broad ; 

 destitute of the W-shaped crown. 



