VO i889. n '] PROCEEDINGS OF THE NATIONAL MUSEUM. 639 



The following notes have been made on the terminal digits. That of 

 the third digit of the third finger is little over 5 mm in length, is slightly 

 curved toward the trunk at the tip. A thin membrane is seen at the 

 .distal half at the thumb side. The wing membrane extends to the 

 tip toward the trunk. 



The terminal digit of the fourth finger is 3 mm long. The membrane 

 is not attached to the somad surface ; while on the pollicad surface it is 

 attached the entire length of the digit. The phalanx is markedly 

 deflected on the free margin of the membrane and ends in a free lobe- 



The terminal phalanx of the fifth finger is slightly curved somad. It 

 is 3 mm long and nearly l mm wide at base. The membrane is attached 

 to the second phalanx at the middle of the pollicad margin, but reaches 

 to the tip of the phalanx on the somad side. 



No entopatagial lines are seen. The internal cutaneous line exhibits 

 a superior branch. The nerve ends abruptly by inferior vertical 

 branches as in N. brasiliensis. A line is seen on the interfemoral mem- 

 brane extending from the middle of the thigh to the free margin of the 

 membrane. 



Cranium. — The cranium is of the type N. macrotis. The facial region 

 is high, the nasal bones at the anterior nasal aperture being the highest 

 point of the vertex. The upper border of the aperture is defined by a 

 transverse line, which forms a right angle with the lateral border. A 

 line drawn downward from the border intersects the infraorbital fora- 

 men at its posterior limit. The zygoma is without elevation. The 

 ethmoidal swelling (by which term is meant the swelling in the orbito- 

 temporal fossa of the frontal bone over the ethmoid), is rounded. The 

 palatal rugaB opposite the molars abruptly angulated, the angle being 

 forwards. 



In contrast to the above, the skull of N~. macrotis presents the fol- 

 lowing: The facial region at the anterior nasal aperture is the lowest 

 part of the vertex. The upper border of the aperture is A-shaped. A 

 line produced downward lies in front of the infraorbital foramen. The 

 zygoma with posterior elevation. The ethmoidal swelling is ridge-like. 

 The palatal rugae opposite molars not angulated, but slightly curved, 

 the curve being forwards. 



Dental formula the same as in the preceding species. 



The first maxillary premolar in N. orthotis is in the outer angle be- 

 tween the second premolar and the canine. It is smaller than in N. 

 macrotis. The postero-iuternal cusp of the first and second maxillary 

 molars continuous with a single crescentic cingulum. The cingulum of 

 the third molar of the same series of a single crescentic form. Mandib- 

 ular incisors four. The first mandibular premolar touches canine. 



In iV 7 . macrotis the first maxillary premolar is in dental arch, i. c, is 

 neither in outer or inner angle formed by the crowding of the canine 

 tooth and the first premolar, but is in the axis of the dental series. 

 The posterointernal cusp of the first and second maxillary molars sep- 



