360 PROCEEDINGS OF THE ACADEMY OF 



cation commences from a small wart placed midway between the eye and 

 mouth, and extends downwards and forwards to join its fellow of the oppo- 

 site side in a median callosity, it in our animal is sufficiently large to cover 

 in the angle of the mouth. The second fold commences at the external lobe 

 of one ear, and terminates at the corresponding point of the opposite ear. It 

 possesses in the centre a little pit, which is probably glandular, and corresponds 

 to the cervical sac of Taphyzous. This fold in our animal is less distinct than 

 in others, and terminates in the third plication. 



It is in the last fold that the chief peculiarity of the new form is discovered. 

 Instead of being but a slight elevation of furred skin, it forms a large hairy 

 mask, which, when elevated, hides the face. It is naked within, furred without. 

 The lower and middle parts are sparsely covered with soft hair, while the upper 

 portion possesses two thick clumps of fine fur, one on either side of the central 

 line. This development of the skin gives the animal a very grotesque appear- 

 ance. The entire arrangement might with propriety be compared to an 

 ancient vizor surmounted with rosettes. 



The thumb is large, the basal joint smallest. It is about the same size as 

 that of C. mezicanus; larger than that of C. flavogularis and senez, judging from 

 their respective figures. The wing membranes have the same beautiful trans- 

 lucent lines uponthem, and in the same positions. That portion between the 

 first and second figures is free from pigment. The interfemoral membrane is 

 excised and hairy. No differences are observed in the skull, either in the den- 

 tition or contour. 



We hesitate in defining the position of this bat. Are we to consider it a new 

 genus, or only a new species of a known one? It would, indeed, seem that such 

 a marked peculiarity would constitute a sign of more than specific value, yet 

 the general conformation of the animal in all other respects to a common type 

 prevents us in exalting it to a position of generic importance. The dentition, 

 the shape of the skull, the markings of the membranes, the facial lines, and 

 even the whitish shoulder tufts, are common to all ; and, in fact, the unusual 

 growth of the cervical plicae and some minute differences in the accessories of 

 the ear, are the only points upon which a generic distinction can be based. 

 So while believing that the differences between this species and any one of 

 those belonging to Centurio much greater than those which exist between any 

 two of the species of that same genus, we at the same time do not consider 

 that the mere excessive development of a portion of skin is sufficient to form a 

 genus in mammalia. We, therefore, taking a middle course, insert our new bat 

 in the following table, thus : 



FHYLLOSTOMIDJE Geofr. 



CENTURIO Gray. 



C. senez, Gray. 



C. flavogularis, L. and P. 



C. mezicanus, De Sauss. 



Subgen. Tkichocortes nob. 



C. McMuktrii,* n.s. General color russet-brown with an inclination to fawn. 

 The hair of the back is thicker than that of the belly, and is tricolored, the 

 base being plumbeous, the centre paler, and the tip subrufous with fawn. The 

 arms and interfemoral membrane are hairy ; that of the former with thick and 

 short, that of the latter with long and scanty hair, extending down on the back 

 of the feet. The fur of the belly has a tendency to fawn color, especially near 

 the pubis, where there is a distinct line of this hue. The three shades noticed 



* After Prof. McMurtrie, of the Philadelphia High School. 



[Nov. 



