— 172 — 



The black dorsal band is namely on the posterior back distinctlv 

 and regularly serrated towards both sides, as if a séries of about a 

 dozen black rhomboidal spots had been chained together. This is 

 the more conspicuous, because the ground colour is rust red. 

 When I first saw this strange pattern it striick nie at once, that it 

 miçrht be a réminiscence of a formerh existingf, transverselv 

 striped pathern, as that of Cepkalophus Doriœ. The number of 

 bands of the latter is also approximatelv the same. As I hâve no 

 access to any materia' ot (\ Doriœ I cannot form anv opinion 

 about the more or less close relationship between thèse Duikers. 



The skuUs of Cephnlophns leucogaster from varions localities 

 appear to vary but little. The largest skuU in the collection is that 

 of a maie from Zambo (n° 3356) which has a basai length of 

 168.2 mm. ('). It is possible that the largest spécimens are found in 

 the Ituri torest, but nol ail spécimens there are superior in size, as 

 a female (n° 2414) skuU from Mawambi has a basai length of only 

 159 mm., while the corresponding measurement of a temale from 

 « province orientale » is 162.3 mm. In maies from the same locality 

 I hâve found the same to vary trom 158.3 to 161 mm. in three 

 skulls, and in a maie from Punga it was onlv 155 mm. No racial 

 différences can be based on such a variation. 



The nasal région is flat, and the same straight contour Une 

 continues half way up on the frontal bones. The latter are, howe- 

 ver, convex and rise above the plane of insertion for the horns 

 especially in the maies. It is interesting to find that this exterior 

 sexual différence is due to a strong thickening of the frontal bones 

 in the maies. The thickness of the frontal bone is f. i. in a temale 

 maximum 3.5 mm. while in maies it ma\ rise to g-ii mm., or 

 perhaps more. As in C. Weynsi this strengthening of the skull in 

 the maies is an adaptation to their butting and fighting. 



I hâve seen spécimens from différent places in the Ituri forest as 

 Béni, Mawambi, Zambo, Punga and Popoie, further from « \)XO- 



(') The same measuremeni ofa female from Beni I hâve ai anolher oppurtuiiiiy siaied 

 to be 167.5 ni'"- 



