PAPIO PPUINOSUS. 
79 
Papio PRumosus, Thomas. 
Papio pruinosus, Thomas, Proc. Zool. Soc. 1896, p. 789, pi. 38. 
This remarkable male baboon from Monkey Bay, Livingstone Peninsula, at the 
southern end of Lake Nyassa, has been described under the name of P. pruinosus. 
In the original description it is stated that it is distinguished at a glance from every 
other species by its hoary-grey colour, white belly, and unannulated fur. 
The interest attached to this form, in so far as the zoology of the region to the south 
of Egypt is concerned, is the circumstance, already mentioned, that Piippell has stated 
that he had heard of the existence, in the wooded district of Dar-Fur and in the 
southern provinces of Abyssinia, of a large unknown “ CynoGephalus^' having whitish 
hair throughout, and red callosities and buttocks, and also red on the middle of the 
tail. As P. pruinosus is based on a skin, nothing is known of the colour of these 
parts in the living animal. 
This specimen has been described as follows:—“ General colour hoary grey. 
throughout; on the upper surface there are two sorts of hairs, the shorter about 
3 or 4 inches in length and the longer about 7 inches ; both have black tips about ^ to 
1 inch long, while their remainder is dirty white. In a general view the black tips of 
the shorter hairs show clearly against their white bases, but those of the longer hairs 
do not show at all, so that these latter look wholly white. The general hoary colour 
obtained by this mixture of black and white extends all over the upper surface, 
including the head, along the outer sides of the limbs to the metapodials and to the 
end of the tail, which is, however, rather blacker proximally and whiter terminally than 
the rest of the body. Tip of tail untufted. Below, on the cheeks, chin, and belly, and 
on the inner sides of the limbs, the black tips disappear; the fur is then entirely dirty 
white. The fingers and toes are also nearly unmixed white.” It may be added that 
on the pectoral region hairs are met with having white apical tips succeeded by a 
blackish ring follow^ed by white, which is the colour of the remainder of the hair. 
The most marked feature of the skull of P. pruinosus, as compared with those of 
baboons referable to P. cynocephalus, is the shorter and less deep muzzle and the full 
and more rounded globular character of the calvarium, associated with an arching of 
the frontal region never met with in these baboons. Although the profile has a more 
downward and forward slope than in the type of P. cynocephalus subsp. iheanus, the 
difference between them in this respect is not much. As was to have been expected, 
a shorter palate accompanies the reduced muzzle. 
The skull of this somewhat enigmatical baboon is what may be called adult, but 
yet with a capacity for further growth. This is evinced by the position of the last 
upper molar, by the little development of the triangular space behind it, and by the 
canines being not yet fully exposed. The teeth are small, but not so small as in some 
