PROCEEDINGS OF THE NATIONAL MUSEUM. 



637 



by a fold of skin which extends from the pubis to the lower third of 

 the tibia. 



The tail menibrance with distinct pelvo-tibial line, but without the 

 line from knee which is seen in N. braseliensis. The free margin of the 

 membrane is without the lobe which is so well defined in the species 

 last named. 



The Cranium. — The superior angle of the occiput is more acute than 

 in N. brasiliensis aud smaller by one-half. The temporal crest is dis- 

 tinct throughout its entire length. Iu ¥. brasiliensis it is absent except 

 at the anterior half. The dorsum of the face is without the groove so 

 characteristic of N~. brasiliensis. The anterior nasal aperture is ovate, 

 not cordate, as in the species last named. The lachrymal process is 

 conspicuous and trenchant. The zygomata are of uniform width. 

 The meutum is recedent, the posterior border being on a line which 

 extends between the second premolar aud the first molar. The coro- 

 noid process is scarcely higher than condyloid ; the angular process 

 projects well back of the condyloid. 



Measurements of cranium. 



N. brasil- 

 iensis. 



Length 



Width between zygomata posteriorly 



Width of cranium at narrowest part 



Distance from anterior edge second premolar to end of face 



The Teeth.-lm.h±, eg, pm. g, m.g. 



Upper incisors near together their entire length. Interval between 

 them much less than in N. brasiliensis. First premolar lies to outer 

 side of the postero-basal ciugule of the canine, which also touches the 

 second molar. In N~. brasiliensis the first premolar is in line with the 

 cingule. This distinction is associated with a shortening of the axis of 

 the face, from the center of the incisorial space to the first premolar. 



Lower incisors equal, bilobed, not crowded. 



Measurements of i 



Milli- Milli- 

 meters, meters. 



Milli- 

 mettrs. 



Length of head and body 



Length of tail in membrane 



Length of tail free 



Length of forearm 



Length of first ringer, including metacarpal. 



Length of second metacarpal 



Length of third metacarpal 



Length of fourth metacarpal 



Length of fifth metacarpal. 



Length of tibia 



Length of foot 



First phalanx. 



t Second phalanx. 



