320 PROCEEDINGS OF THE ACADEMY OF [1889. 



to the space between these lines. The third interspace with nerves 

 as is so generally the case with the Phyllostpmidae, viz., the predigital 

 from the metacarpophalangeal joint and the postdigital from the 

 first interphalaugeal. The longitudinal line is conspicuous the en- 

 tire length of the interspace. 



The terminal phalanges are much the same as in Artibeus but 

 that of the fourth digit is less lobate. 



A caudo-tibial line conspicuous in the interfemoral membrane. ' 



Noctilio leporinus. 



The prebrachium without distinctive markings. The thickening 

 in the tendon of occipito-pollical muscle as long as the thumb and 

 lies on the radius. 



Intercostal lines small inconspicuous. The intercosto-humeral 

 small unbranched, does not reach farther than elbow. The internal 

 cutaneous system of two divisions, the vertical being absent. The 

 oblique line with long horizontal primal branch. The abrupt transi- 

 tion of the oblique fibres from the horizontal line is the same as in 

 Atalapha. Thirteen vertical lines traverse the mesopatagium. 

 An elevated oblique fold of skin passes downward and backward 

 from the palmar aspect of fourth and fifth metacarpal bones. 



In the fourth interspace the digital nerves appear at the middle of 

 metacarpals. The postdigital is seen running parallel to the fourth 

 metacarpal bone before being distributed to the membrane. A 

 tendon is seen on either side of the fifth rod at its distal third. At 

 the first interphalaugeal joint of the third and fourth fingers a 

 nerve appears on the opposed sides of the third interspace and each 

 is distributed separately to the membrane. 



Interfemoral membrane scarcely translucent in portion carrying 

 the tail and is traversed by a line without subdivisions on either 

 side of the tail. The infracaudal portion is much thinner than the 

 caudal and is traversed by an oblique line much divided on either 

 side of the terminal point of the tail. Respecting the differences in 

 translucency of the interfemoral membrane it is seen that a similar 

 contrast is seen in the wing-membrane, viz., in the endopatagial and 

 mesopatagial tracts. These portions in Molossus and Atalapha are 

 apt to be more or less hairy. 



The sickle-shaped terminal phalanx of the third finger is free ; that 

 of fourth finger is thread-like, sigmoid, and inclosed ; and that of 

 the fifth digit acicular, deflected toward body and is also inclosed. 



1 Brachyphylla has been described as tailless. In a number of examples 

 recently examined a tail measuring 3mm. was detected. 



