2 NORTH AMERICAN BATS. 



no basal cusps. First premolar of peculiar shape, thin and com- 

 pressed. It is uuicuspid, with a small posterior basal point 

 visible from without. The second is thicker, and has an internal 

 basal ridge. The third and fourth molars not peculiar. The 

 fifth is small, greatly compressed from within outwards. 



Lower Jaw. — Incisors crowded, indistinctly trilobed ; canines 

 with a marked basal cusp. The first and second premolars of 

 aljout equal size, thick, with basal ridge. The remaining molars 

 not peculiar. 



In placing this genus under Megadermatidse it should not bo 

 considered as having any strong affinity to the genus 3Iegaderma. 

 When a family or subfamily is extensive, the first and last members 

 of it often differ considerably from one another ; and in the pre- 

 sent instance the genus Megaderma may be considered to stand at 

 one end of the subfamily, while Macroius is at the other, the 

 intervening members being wanting. 



The nose leaf of Megadeinna is complex and naked, that of 

 Macrotus is simple and hairy. 3Iegaderma has no tail, while 

 that of Macrotus is produced beyond the interfemoral membrane. 

 Macrotus has some resemblance to that group of Phyllosiomatid as, 

 of which Glossophaga is the type. The head has the same long, 

 rostroid appearance, the small acuminated nose leaf, the cleft in the 

 lower lip, and the abrupt interfemoral membrane. The genus, 

 in fact, appears to stand between Megadermatidee and Phyllo- 

 stomatidse. 



The genus Macrotus was established by Gray in the Proc. 

 Zool. Soc. for 1843, p. 21, upon specimens of M. waterhousii 

 brought from Hayti by Dr. Parnell. The description was very 

 brief, and accompanied by no mention of the dentition. 



