A MONOGRAPH OF THE BATS OF NORTH AMERICA. 167 



of tlie tragus are of equal heiglit, quadrate, and measure a little less 

 than 1""" in all proportions. They are directed obliquely backward, so 

 that the upper border is vertical. On the mesopatagium the first 

 obliipie hand is small and indistinct. It is attached to the side of the 

 fifth metacarpal bone (i. c, it is free from the nmscle mass). The pouch 

 is indistinct. The submeutum is provided with a distinct wart, but no 

 median ridge lies between the wartand the lower lip, as in iV". brasi- 

 liensis. 



Maxilliary teeth. — The incisor of each side is slender, simple, obliquely- 

 directed downward and inward, but not touching its fellow. A wide 

 space exists between it and the canine. The canine is slender, vertical, 

 scarcely produced beyond the second premolar; cingulum i)roduced 

 posteriorly. To the outer side of this prolongation, but set in slightly 

 irom the outer limit of the tooth series, is seen the minute first premo- 

 lar. The second premolar with well-defined protocone and fiuted para- 

 cone — the heel-like projection of the cingulum is discernible. The first 

 molar possesses a sharply defined acute protocone of low elevation, the 

 commissures embracing the two v's. The paracone is slightly smaller 

 than the metacone. The hypocone unusually well defined, often almost 

 as high as the protocone and sometimes bilobed. The second molar as 

 the first, but with ecpial cusps and simple hypocone. The third molar 

 with protocone as in other molars. The anterior V slightly compressed. 

 The posterior V with anterior limb entire; posterior limb absent. The 

 molars do not touch except at their buccal surfaces. 



Mandibular teeth. — The incisors, three in number, the first and second 

 equal or subequal, bilobed, without basal cusps. The tliird much 

 smaller, wedged in between the second and the canine, and is often 

 lost. The canine with sharply defined cingulum entirely round the 

 tooth. The premolars slightly crowded, the first the smaller. Of the 

 molars the V is smaller than the heel throughout. The anterior limb 

 of the heel adjusts against the V at about its middle. The triangle 

 composed of paraconid, metaconid, and protocinid is much compressed 

 from before backward. The paraconid not inclined forward as is seen 

 to be the case in Atalapha and Macrotm. The commissure at the base 

 of the heel is conspicuously cuspidate. In the tliird molar it, in addi- 

 tion, bears a second small acicule. The cingulum is visible throughout 

 at the base on the buccal surface. 



*S7.i<//.— Greatest length, 15'""^; greatest width, 10"""; least Avidth, 

 4"'"'; length of face from orbit, 3^">"'; distance from infraorbital 

 foramen, to the tooth row, 1"'"'. The sagittal crest is defined the entire 

 length; weaker posteriorly. The posterior temporal crest is trenchant, 

 forming with its fellow the sides of a broad-based triangle, 2"'"' long. 

 The mesencephalon is .?"'"' long. The anterior temporal crest ends 

 on the orbital crest, which is sliari)ly (uitlined and as long as the orbit 

 is high. The inner wall of the orbit is fiat. The vertex of the face 



