PROCEEDINGS OF THE XATIOXJL MUSEUM. 11\ 



by possessing- a shorter calcaueum;' by tlie breadth of the lower 

 incisors; by the fur being reddish-brown above and yellowish white 

 beneath. The tigure he ])resents is a cojty of the spccinien in the Ber- 

 lin Museum, and is based on an original drawing made under the sui)er- 

 vision of Peters. The specimen would appear to have been a dried 

 skin. The tragus is not erect, but deflected in a manner not described 

 by any writer. The chinplate is very large. The muzzle is concave 

 both at the sides and at the upper margin. The transverse ridge across 

 the face vertex is as thick in the center as at the sides, thus differing 

 from Dobson's description. The auricle is hairy on the interior. 



The standard for comparison ac(!epted by Dobson is a correct one. 

 There is no form with which Diphylla can be compared so profitably as 

 Desmodm. On page 775 1 have grouped a number of cranial characters 

 which the genera have in common. To these many others in the skel- 

 eton and the superticial parts may be added, a partial list of which is 

 here given : 



Plan of elbow joint the same, viz., a simple middle convexity jilaying 

 on two external flanges ; epitrochlea transverse, massive. A calcaneum 

 (without calcar) constituting the projection at ankle for the attachment 

 of the interfemoral membrane; a lower li]» more or less cleft in the 

 middle line;" absence of the tail; the small size of the second inter- 

 digital space; the greatly shortened face axis, and teeth specialized for 

 cutting and piercing. 



I have thought it desirable to revise the description of DiphyUa by 

 the aid of the two dried specimens already noted. The following is an 

 account of the fur: The tips of the hair covering the back and sides of 

 the neck, of a dark fawn, the shafts nearly white. The effect on the 

 eye is of the mingling of the white and dark fawn colors. It is dis- 

 tinct from that of the hair over the back, where the tips are dark brown, 

 and, while the shafts are white, they are not seen, owing to the 

 adpressed arrangement of the hair. Toward the rump the hair is 

 more woolly. The arm and forearm are closely furred almost to the 

 wrist, A tine growth of hair covers the thumb. The thigh, leg and foot 

 are also hairy, but the fur is here woolly and sparse. The skin to the 

 outer side of the leg, tlie hem and margin of the endopatagium (wing- 

 membrane from body and posterior extremity to the fifth digit) is hairy. 



The prevalent color of the under surface of the body is gray. The 

 white color on the hair is confined to the base. The wing membranes 

 are covered, by a broad triangular field of gray hair, whose base is at 

 the side of the body and whose apex reaches to within an inch of the 



1 In three specimens of Desmodus studied, the calcaneum was foimd shorter than 

 in DiphyUa. Indeed, in Desmodus the calcaneum is a mere tubercle, scarcely measur- 

 able, while in DiphyUa it constitutes a rod 4 millimeters long. 



-This assertion is made advisedly, notwithstanding the statement of Dobson that 

 the lower lip is "not grooved," and the figure of Peters (vide Alston) in which a very 

 large indiviilual truncate labial plate is seen. Unfortunately the plate is not repre- 

 sented as divided in figure 1. 



