90 EINAR LÖNNBERG, MAMMALS COLLECTED IN CENTRAL AFRICA. 



basally of the body colour, then with whitish hairs, and finally the outer half with a great 

 black tuft, which at the tip and its lower side has a »tendency to show white». 



Total length of skull 182 mm. 



Basal » >> » 164 » 



Zygomatie breadth of skull 77,7 » 



Distance from orbit to tip of premaxillary • • • 96 » 



Length of nasals 67 » 



Interorbital breadth (least) 37 » 



Lengtli of upper molar series 51,8 » 



Greatest breadth of m* 13 » 



Length of bulla- 24 » 



Breadth of palate outside m' 55 » 



If these measuréments are comparcd with those of the type of C. claudi 1 it is found 

 that, although the total length of both is almost the same (resp. 182 and 185 mm.), the 

 length of the rostrum (102) and the length of the nasals (75 mm.) of C. claudi is distinctly 

 larger than those of the present specimen. The latter approaches in these respects sorae- 

 what to C. nigrifrons, which, however, is much different in colour. The geographical 

 neighbour C. rubidus from Ruwenzori has still shorter rostrum (85 mm.), and nasals 

 (60 mm.), and it is also different in colour. The molars are not broad, but nevertheless 

 broader than in the nearest related forms C. nigrifrons and C. rubidus. 



The narrowness of the skull of the present specimen, and the flatness of its upper 

 surface appears to be a rather striking characteristic. Another is the truncate posterior 

 end of the nasals (Pl. X, fig. 3), which only show a slight convexity in the middle of the 

 suture with the frontals. The preorbital pit is very deep and large. The premaxillaries 

 are rather broad at their upper end. The bullat are large, but extremely thin-walled (like 

 paper!). Foramina incisiva are very large, measuring 27,» mm. in lengtli by 6,5 in breadth. 

 The prsedental portion of the palate is very narrow and constricted, measuring only about 

 18 mm. in breadth, and with a narrow edge along the median suture. The median posterior 

 palatal emargination extends further forwards than the lateral ones and reaches almost 

 to a line through the middle of m 2 . The lower jaw is also very slender (Pl. X, fig. 3), 

 the greatest height of ramus horizontalis below m i being only 20 mm. The whole structure 

 of the skull appears to indicate an animal feeding 011 tender vegetable matter (leaves 

 and young shoots). The upper molar series is almost straight along its inner contour line, 

 but converging forwards so that the distance between the inner sides of ra 3 is about 32 mm. 

 but between p l about 20 mm. 



The horns (Pl. X, fig. 3) are short and blunt, greatest length 36 mm., greatest 

 transverse diameter 14 mm. They are much worn 011 the upper surface by branches and 

 twigs, when the animal sneaks through the undergrowth. To xueh a life undoubtedly 

 also the narrowness of the skull is an adaptation. 



Cephalophus leucogaster Gray. 



A young male with only the first molar developed from Beni, Aug., Sept. 1914, 

 and an adult female from the same locality, Jan. 1914. 



1 According to Thomas & Wrou(;hton in Ann. Mag. Nat. Hist. (7). Vol. 19, 1907, p. 38fi — 387. 



