NATURAL SCIENCES OF PHILADELPHIA. 285 



decidedly shorter fhan the head and body (in all the other species 

 treated in this paper it is as long or longer). The vertebrae of 

 the tail of the only specimen before me in which these bones re- 

 main in situ, measure less than 4.00 inches, the length of the head 

 and body of the same specimen being about 4.50. Likewise the 

 hind feet are proportionally shorter than in any of the other spe- 

 cies ; they average only one inch in length, thus not exceeding 

 those of P. penicillatus, which is a smaller animal. On the con- 

 trary, the ears are larger, both absolutely and relatively, than those 

 of any other species, standing about 0.40 high, measured from the 

 notch ; the ears thus project conspicuously above the fur of the 

 parts ; the flap is suborbicular in outline ; the antitragus develops 

 a very prominent lobe, bounding the notch posteriorly ; and in 

 front of the notch there is also a little prominence, just behind 

 the termination of the margin of the ear. The flattened portions 

 of the auricle are sparsely pilous inside and out, and a tuft of 

 lengthened hairs springs from the front border of the ear. 



The attenuated and elongated muzzle is densely pilous, except- 

 ing a small T-shaped nasal pad, divided by a median depression. 

 The upper lip, in particular, is thickly covered with stifflsh, flaring 

 hairs, completely concealing any median cleft which may exist, 

 and forming a heavy fringe which droops over and almost hides 

 the incisors ; there is a reversed tuft of bristly hairs on the chin. 

 The openings of the cheek pouches seem to have no peculiar char- 

 acter, being much as in other species of the genus; the cavity 

 admits the first joint of one's little finger. The whiskers are very 

 numerous and fine; the shorter colorless ones seem like mere 

 lengthening of the hairs of the muzzle; others, stiffer and colored, 

 reach rather beyond the head. There are also some long special 

 bristles over the eye, and others between the eye and ear. 



The palm proper, and under surfaces of the digits, are perfectly 

 naked, though a considei-able fringe of hairs falls down from the 

 wrist. There is a large and conspicuous smooth tubercle on the 

 outer side, at the base of the fifth digit ; two others, one on each 

 side, at the wrist, and others at the bases of the intermediate 

 digits ; the disposition of these smaller ones is not very evident 

 in the dried specimens. The thumb is rudimentary, a mere stump, 

 bearing a flattened obtuse nail; the other digits are armed with 

 ordinary compressed, acute and moderately curved claws ; the 3d 

 is longest; then come 4th, 2d, and 5th in succession. Of the hind 



