126 NYCTINOMUS BEMMELENI. 



In the other species of the genus Nyctinomus the forearm 

 always exceeds in length the metacarpal bone of the third 

 and the fourth finger: in our species, however , the case is just 

 the contrary , for the metacarpal bone of the third finger 

 exceeds the forearm and that of the fourth finger equals 

 the forearm in length. 



Comparatively the tail is not longer than in the other spe- 

 cies , but its part included in the interfemoral membrane 

 is particularly short and therefore the free end of the tail 

 is extraordinarily long. 



In the other species of this genus according to rule the 

 wings are attached to the outside of the tibiae or ankles, 

 and the interfemorale membrane to the inside. Now 

 in the species in question the wings and the interfemoral 

 membrane proceed from the same point , to be found on the 

 middle of the tibia just between the out and inside. 



The thumbs, the first and the fifth toe are very thick; 

 especially the latter, and further the other toes are orna- 

 ted with long rigid , white colored , overhanging hairs — as 

 commonly in the other species of this genus. 



Fur dark smoke-brown above, yellowish brown beneath. 

 Ears, wings and tail colored as the back. 



Upper incisors well developed , close together , separated 

 from the canines by a rather large interval. Lower ones 

 very little, bifid, crowded. First upper premolar very 

 small , acute , not filling up the space between the canine 

 and second premolar: first lower premolar about half the 

 size of the second premolar. 

 Type in the Leyden Museum. 



Measures of the single specimen , being a female , pre- 

 served in alcohol. 



m. m. 



Head and body 54 



Tail . . . " 35 



Tail free from membrane 26 



Ear ... 15 



I^otes iroxxi the Leyden lMu.seu.rn. 



