— 164 — 



Cephalophus Weynsi Thomas. 



The very rich material of this Duiker proves that it is essentiallv 

 similar in différent parts of Belgian Congo, which is proved by the 

 foUowing measurements of skulls of fullgrown individuals from so 

 distant provinces as Ituri and the district of Lake Leopold II. 



Total length of skuU 192 



Condylobasal length of skull . 

 Basai length of skull .... 

 Zygomatic breadth .... 

 Least interorbital breadth . . 



Preorbital length loi 



Length ofnasals 



Breadth of braincase .... 

 Length of upper molar séries . 



» lower » . . 58 58.2 61 57 



There can hardly be e.xpected a fuller agreement than this^ espe- 

 cially if it is considered that the maie from Mawambi was a little 

 older than the one from Oshwe, and the female from Inongo a 

 little older than that from Mawambi, which facts acconnt for the 

 somewhat shorter, i. e. more worn, molar séries in the older spé- 

 cimens. The measurements indicate also another thing of interest 

 viz. that the nasals of the females with increasing âge grow to a 

 much greater length than in the maies. The preorbital portion is 

 longer in the females in the same degree as their skulls are larger 

 than those of the maies, or a little more. Another thing which is 

 noL seen in the table of measurements, but which makes itself very 

 apparent at an examination of the skulls, is the great increase in 

 thickness of the frontal région of the bucks with âge. A young 

 buck of C. Weynsi with only ?«' developed has a thickness of the 

 frontal bones amounting to about 3.5 mm., but the same measure- 

 ment in an old buck can increase to 13.5 mm. In some spécimens 



