134 Dr. J. E. Gray on a 



cipitous walls of granite, or even along the polished branches 

 of tlie little trees in the ravines ; but the mystery was solved 

 Avhcn I tried to pick up an animal which I myself had wounded. 

 The granite was as smooth as pavement ; yet w^hen I seized 

 the creatm-e by the neck it clung like bird-lime to the ground, 

 and required some force before it could be removed." 



The rock-rabbits, called " Kako " by the Nubians, from 

 the noise that they make, " dwell among the crevices of the 

 gneiss. Immediately after sunset or before sunrise they can 

 be seen everywhere, squatting like marmots at the entrance to 

 their holes, into which at the approach of danger they dart 

 with wonderful snorts and grunts." 



2. Dendrohyrax arhoreus. 



Fur very long and soft ; hair blackish, with greyish tips ; 

 back wnth a short, broad, whitish spot ; the ears hairy ; the 

 lips, throat, chest and underside, and inner side of limbs 

 whitish. 



Hah. South-east Africa ; Natal. 



This species is most distinct in appearance from all other 

 Hyraces. 



3. Dendrohyrax dorsalis. 



Covered with harsh browTi fur, rather paler on the chest 

 and beneath ; has a large yellowish-white dorsal streak. 



Hah. Western tropical Africa. " Makes a great noise," 

 according to the account of Mr. Winwood Eeade, who in- 

 formed me that the specimen of this animal which he gave to 

 the British Museum was the only mammalian taken during 

 the march to Coomassie. 



This species is known from all other Hyraces by the large 

 size of the head, the harshness of the fur, and the large size 

 of its dorsal spot. 



The skulls of Dendrohyrax may be divided thus : — 

 I. The inter inaanUaries squarish, luith a broad truncated hinder end. 



1. Dendrohyrax dorsalis^ Grray, Hand-list, pi. xiii. fig. 1. 

 Infraorbital foramen large, far in front of the orbit ; orbit 



roundish. 



2. Dendrohyrax arhoreus, Gray, Hand-list, pi. xiii. fig. 2. 

 Infraorbital foramen small, just in front of the orbit ; orbit 



nearly circular. 



