— 174 — 



collection proves that in Central Congo, in jA,ru\vimi, fullv as large 

 spécimens are to be found, and I hâve formerlv quoted measure- 

 raents of a buck from Mukimbungu, Lower Congo, of similar size 

 (1. c, p. q2). Consequentlv if the subspecific nanie on'eiitalis, based 

 on superior size only, shall be used, it must comprise the (\ casta- 

 tieus forms from Lower Congo to Uele. 



The skulls eniimerated above resemble each other in gênerai 

 shape, but they as well as some other immature skulls from the 

 same and corresponding localities show a certain variation. Thus 

 f. i. does the premaxillarv in most cases not rea.ch the nasal, but as 

 an exception it does so. 



The horns of the female sex appear to develop verv variably. 

 A voung adult 9 {in^ developed, but the posterior milk molar not 

 changed) has yet no traces of horns. The same is the case with 

 some adult females as well. As a rule, however, small horn cores 

 begin to grow up at the same tinie as iii^ appears. Probablv the 

 females are either without horns, or onlv provided with verv small 

 horns. An exception from the rule forms, however, a female from 

 Bambili, forest of Ababua (n° 2306), which has horn cores measu- 

 ring about 2 cm. 



The colour of this Duiker is much variable as well with regard 

 to the development of the black on the limbs and below, as with 

 regard to the shades of red on the body. A whitish spot over the 

 eye is sometimes présent in spécimens from varions localities as f. i. 

 Bambili, Barumbu. 



Cephalophus castaneus Arrhenii Lônnb. 



Two spécimens (2231 and 2413) collected at Mawambi bv 

 Christy belong to this subspecies, which is recognized on its 

 somewhat smaller size (basai length resp. 160 and 159.5 m"!-) ^nid 

 still better on the direction of the horns. The latter form a certain 

 angle against the frontal plane which is not the case in C. castaneTis 

 orientalis. If two skulls of both forms are laid side bv side this 

 différence is most easilv seen. 



Both thèse spécimens are dark, but, as the great séries of 



