BY C. W. DE VIS, M.A. 1131 



are white, as are also the inside of the arm to the elbow and of 

 the thigh to the knee. A stripe of grey separating clearly the 

 dark brown of the upper surface from the white of the lower runs 

 along the side of the chest and abdomen. The terminal fourth or 

 a little more of the tail is white. The ears are narrow and short 

 appearing but little above the fur. The muzzle is nearly devoid 

 of hair for a space of 5 mm. behind the tip and behind the 

 posterior edge of the nostril. The hands and feet are large, and 

 the nude surface of the tail is beset with prickly tubercles. 

 Length of the head and trunk 13J in. (343 mm.), tail 15Jin. 

 (413 mm.). 



The adult female is, on the upper surface and inside the limbs, 

 smoky brown with little lustre, and that chiefly on the nape and 

 shoulder. On the loins and rump the colour deepens to a blackish- 

 brown. Chin pale brown. Throat and behind the pouch dirty 

 white. Rest of the lower surface brownish with admixture of 

 much greyish-white, within the pouch chestnut. 



The hands and feet are much smaller than in the male, and the 

 nude surface of the tail is comparatively smooth. (These sexual 

 characters are common to this species and to P. herbertensis.) 



The skull extracted from this skin is so closely represented by the 

 figure of that of P. herbertensis £, in Proc. Zool. Soc. 1884, p. 384, 

 as to persuade one that it is specifically the same as the original of 

 the figure. 



But a doubt remains — the females of the two species may be so 

 nearly alike as to require for their determination a direct com- 

 parison of skins. All doubt on this score is removed by an 

 example of an indubitable female of P. herbertensis captured in the 

 society of an adult male, and equally out of accord with Mr. Collett's 

 description and its sombre subject. The upper surface of this sex 

 of P. herbertensis is even more nearly black than in the male ; the 

 lower surface as purely and definitely white. Above the elbow the 

 arm is encircled by a white ring, narrow but distinct. There is 

 however no trace of a similar ring around the thigh, as developed to 

 a greater or less extent in the mature male. 



