340 Zoological Society : — 



long as the basal phalange of the longest finger ; all the remaining 

 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. Siiugeth. 

 1855*. 



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

 brown. 



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



of the tail 1 3 



of the head 7 



of the ears 5^ 



of the tragus 2 



of the fore-arm 1 3^ 



of the longest finger .... 2 6 



of the fourth finger .... 1 8^ 



of the tibia 7 



of the foot and claws. ... 3 



Expanse of wings 8 3 



Hab. Puerto Caballo, Central America. 



2. Hyonycteris albiventer, n. s. 



The specimen from which the present description has been taken 

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

 peculiarities 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 have 

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

 respects the specimen is in sufficient 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 margin (towards the top of the ear) is very 

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

 wards. The outer margin is considerably hollowed outf for nearly 

 the whole of its length, but with a rounded prominence at its base. 

 The face is very hairy, and the upper lip has a distinct moustache of 

 long hair. 



* Gelesen in der Akademie der Wissenschaften, am. 22 Junil854. Berlin 1855. 



t It appears desirable to state that the expression " hollowed out " must be 

 taken in its literal 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 distinct ** notch " in the outer margin of the ear : in Hyonyc- 

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

 case in the specimen I possess, but in the figure already referred to, this is less 

 conspicuous. 



