Species of Pedetes inhabiting Angola. 103 



partly visible slaty bases of the hairs. A light area invades 

 the flank-colour from below just in front of the thighs, as in 

 differ. Under parts less pure white than in caffer, the fur 

 noticeably thinner and harsher. Hands and feet as in caffer. 

 Colour of upper surface of proximal three-fourths of tail pure, 

 not darkened by dark hair-tips, the tint being between dull 

 " tawny ochraceous " and " Sudan brown " ; lower surface 

 of same region of tail dirty white, tinged with brown, many 

 of the hairs towards the root of the tail having slaty bases. 

 Terminal fourth of tail black above and below. 



Skull longer and relatively narrower than in P. caffer, the 

 zygomatic arches being considerably less expanded ; zygo- 

 matic and greatest squamosal breadths respectively equal to 

 69' 6 °/ and 56 °/ of the condylo-basal length ; Iti caffer 

 (fourteen skulls belonging to three subspecies examined) the 

 zygomatic breadth varies between 72*3 and 78"3 °/ , the 

 greatest squamosal breadth between 56*7 and 63*2 °/ of the 

 condylo-basal length. The petro-mastoid is rather more 

 inflated than in caffer, for the least distance between the 

 bullae upon the upper surface of the skull amounts to no more 

 than 26'6 °/ of the greatest squamosal breadth ; the average 

 value of this dimension in all forms of caffer is 31*7 °/ OJ the 

 range being 28'5 to 34*7 %. The anterior border of the 

 interparietal is but slightly convex, almost straight, not 

 thrown forwards as a strong- process intercalated between the 

 parietals, as is the case in caffer and surdaster. On the 

 ventral surface the lateral flanges of the basioccipital, abutting 

 against the median surfaces of the auditory bullae, are much 

 less developed than in caffer] there are two small foramina — 

 one behind the other — in the middle line of the basisphenoid, 

 and a larger irregular vacuity in the basioccipital. The 

 fossa containing the anterior palatal foramina is as deep and 

 extensive as in caffer. In profile the maxillary portion of the 

 outer wall of the infraorbital canal is considerably broader 

 antero-posteriorly than in any other Pedetes before me. In 

 caffer and in surdaster the hinder part of the jugal bears a 

 well-marked impression for the origin of the "posfero- 

 superior almost horizontal " portion of the masseter lateralis 

 muscle (figured by Tullberg, Taf. x. fig. 8), and the ventral 

 border of the bone is produced downward.-; and backwards to 

 form a well-marked angular process ; in angolas the muscular 

 impression in question is very feebly developed, while the 

 angular process is lacking. The cheek-teeth offer no tangible 

 differences. The upper incisors are a little less opisthodont 

 than in caffer, but, owing to the irregular form of the incisive 



