1889.] NATURAL SCIENCES OF PHILADELPHIA. 331 



interspace as in this species except that the postdigital appears at the 

 proximal sixth of the fourth metacarpal bone. In one specimen it 

 was absent. Oblique tibial and pubo-tibial lines as in this species. 



Mormoops blainvillei. 



Prebrachium with a tendon lying parallel to free margin at middle 

 third. An oblique line extends from the humerus forward and up- 

 ward. 



Intercostals nine In number, reaching side of trunk, the lowest not 

 larger. The intercosto-humeral forked, reaching the line of the 

 elbow ; several small branches of this line before division pass 

 obliquely downward. Internal cutaneous passes to the extreme tip 

 of the mesopatagium. The main line horizonal to the middle of the 

 membrane and thence abruptly deflected downward and outward. 

 Two superior obliques, six inferior obliques. A broad raised fold 

 extends obliquely on mesopatagium from the muscle-mass of the 

 fifth digit. The fourth interspace with predigital high up on the 

 fifth digit from the 'side of the muscle-mass and supplies two-thirds 

 of the membrane, the postdigital arises from near the proximal end 

 of the fourth digit and supplies anterior third. 



Interfemoral membrane without pubotibial line. Beyond the 

 point at w r hich the tail emerges a straight line continues to the free 

 margin. Two lines pass from the tail, one obliquely to reach the 

 margin, one transversely to reach the calcaneum near the ankle. 

 Three faintly-expressed lines pass from the thigh and leg down- 

 ward. Terminal phalanges quite different from Chilonycteris, that 

 of the third finger ossified with second digit, the remaining two 

 apparently absent, possibly ossified with the second phalanx of 

 their respective digits. 



Chilonycteris davyi. 



Prebrachium tendon seen parallel to proximal half but no oblique 

 tendon traverses the membrane from the humerus. Intercostals 

 fourteen and do not reach the body. Intercosto-humeral as in 

 Mormoops. The internal cutaneous lines thirteen, six of these are 

 confined beneath the main line and are the same as the inferior 

 verticals of other descriptions in this paper. The succeeding two 

 intersect the main line where it turns from the horizontal to an 

 oblique position. The remaining lines pass up toward the radio- 

 metacarpal angle and are ranged on the trabecular of the mem- 

 brane. The tip of the nerve goes to the extreme tip of the fifth 



