179 



membrane entire, completely enclosing the tail, the lašt joint only of 

 which is exserted. Thumb free, nailed, and with a broad suctorial 

 disk attached to it. Index finger very short, scarcely a fourth as 

 long as the basai phalange of the longest finger ; all the remaioing 

 fingers with three phalanges. The feet with five toes, furnished with 

 a suctorial disc. All the toes composed of only two phalanges, and 

 united by a web. Os calcis lobed and long. 



1. Hyonycteris discifera, Licht. et Peters. 



Hyonycteris discifera, Licht. et Peters, Neue merkw. Saugeth. 

 1855*. 



The upper parts cinnamon-brown, beneath paler ; wings dusky- 

 browii. 



Length of the head and body. ... 1 7 



of the tail 1 3 



of the head O 7 



of the ears O 5\ 



of the tragus O 2 



of the fore-arm 1 3į 



of the longest finger .... 2 6 



of the fourth finger .... 1 S^ 



of the tibia O 7 



of the foot and claws. ... O 3 



Expanse of vrings 8 3 



Hab. Puerto Cabello, Central America. 



2. Hyonycteris albiventer, n. s. 



The specimen from which the present description has been taken 

 has lošt some of its parts by accident, and with them some of the 

 pecuUarities described by MM. Lichtenstein and Peters in the paper 

 already alluded to. Thus, the tragus has been eaten away from each 

 ear by insects, the nose-disc apparently so much rubbed as to ha ve 

 lošt its original form, and the thumbs are entirely wanting. In other 

 respects the specimen is in suflficient preservation to confirm the cha- 

 racters given by the above-mentioned authors, and also to furnish an 

 additional peculiarity not given by them in their description of the 

 genus. This will be hereafter indicated. 



The crown of the head is very considerably elevated, the face very 

 concave, and the muzzle rather elongated. The ears are scarcely as 

 broad as high, the inner margiu (towards the top of the ear) is very 

 much rounded, and the extreme tip is conspicuously directed out- 

 wards. The outer margiu is considerably hollovved outf for nearly 



* Gelesen in der Druckerei der Akademie der AVissenschaften, am. 22 Juiiil854. 

 Berlin 1855. 



t It appears desirable to statė that the expression " hollowed out " mušt be 

 taken in its literai sense, as the form here attempted to be described is very dif- 

 ferent from what is usually called " an emarginate ear," in the genus Vespertilio. 

 In this genus it is a distinet " notch '" in the outer margiu of the ear : in Hyonye- 

 teris it is simply a shallow piece scooped out of the margin, — at least such is the 



