36 NORTH AMERICAN BATS. 



Description. — Head flat, but not so heavy and thick as in 

 other species of Scotophilus, moderately hairy ; sides of face 

 swollen, and studded with hair. Xose flat, broad, naked ; nostrils 

 .small, oblique, opening sublaterally. Sides of mouth very slightly 

 whiskered. Ears nearly naked, subelliptical, slightly convex on 

 the inner, nearly straight on the outer border, which terminates 

 near the mouth in a wart. Parts about the head light brown. 

 Tragus straight, blunt, moderately divergent on its outer side. 

 Thumb and feet large. 



Fur thick, long and soft. Color dark rufous brown on back, 

 brighter rufous in front ; base of fur before and behind dark 

 Y)lumbeous. The fur extends to upper third of posterior surface 

 of interfemoral membrane : the anterior surface of which is deco- 

 rated with numerous small tufts arranged transversely. The fur 

 of, body also extends a slight distance upon the anterior surface 

 of the wing membrane. Wings reach to base of toes ; point of 

 tail slightly exserted. Calcaneum moderate — its termination 

 forms no lobe with the interfemoral membrane. 



No. 1002 (included in 5291), a ypung specimen, Carlisle, Pa., 

 is a variety with dark, faintly bicolored fur, of a grizzled olive- 

 brown color. 



Fig. 32. 



S. georgianus. 



Skull small, papery ; flat, but less so than in other species of 

 Scoto2:)hilus. There is a slight tendency to the shape of face 

 peculiar to Vespertilio. 



Dentition. 



Molars Canines — Incisors — Canines — Molars — =34 teeth. 



5 10 15 



Upper Jaw. — The incisors placed as usual, and of the same size. 

 The centrals of equal size and so obscurely bifid that the lateral 

 point seems more like a basal cusp. The lateral teeth cuspid 

 and converging (there are some examples of the bicuspid lateral). 

 Canines rather small, simple. First molar minute, unicuspid, 



