86 BINAE LONNBEEG, MAMMALS COLLECTED IN CENTRAL AFKIOA. 



for grinding the food of the horngunk. The muscles have through this become gradually 

 enlarged, and they have then secondarily influenced the growth and shape of the bones 

 to which they are inserted. 



Cephalophus weynsi Thomas. 



An old female from the »montagne et foret Kabwe, Rutshuru, le ^'/j 1914»i An old 

 female from Beni, Aug., Sept. 1914. 



At Beni these Duikers were known under the name »Kurupa ». There is not the 

 slightest doubt that these two specimens correctly may be referred to the C. weynsi 

 group, but on the other hand they are not quite identical, neither with regard to the 

 pelage and its colour, nor with regard to cranial dimensions. It appears therefore most 

 opportune to regard them as representing two different geographic races. The question 

 is then to decide which one most probably ought to be taken as identical with the t3rp- 

 ical race, if any of them is. I am not quite certain about the last point, but there are 

 several reasons, geographical as well as zoological, which make me inchned to regard 

 the specimen from Beni as most likely nearest to or identical with the typical C. weynsi. 

 The collecting locality near Beni lies somewhat west of that place and is situated in the 

 great tropical Congo forest which extends to the Stanley Falls district, but on the other 

 hand Kabwe at Rutshuru is a from the great Cdngo forest isolated mountain forest, which 

 latter thus might be inhabited by somewhat aberrant forms. The description of C. 

 weynsi as repeated by Lydekkeb^ contains the statement: — »body-hair short and close » 

 - — and this suits the specimen from Beni much better than that from Kabwe. Still more 

 important is that the basal length of the skull of the type of G. weynsi which stiU was 

 young, »a premolaires de lait en place » is recorded^ to be 176 mm. which is almost ident- 

 ical with the same dimension (174,6 mm) of the old female from Beni, while that of 

 the equally old female from Kabwe is only 166 mm. thus indicating a smaller race. It ap- 

 pears thus most suitable to distinguish the Duiker from the Kabwe forest with a third 

 name as : 



Cephalophus weynsi rutshuricus n. subsp. 



With regard to the colour of the head and neck this race resembles that of the C. 

 weynsi in the great Congo forest as represented by the specimen from Beni, but it is gener- 

 ally darker. The neck is not quite so thin-haired as in the Beni-specimen, and its colour 

 on the sides is somewhat more reddish brown. There are more black hairs on the anterior 

 back and over the shoulders, than in the one from Beni, and behind the withers the 

 colour shades from something between »madder brown » (Dauthenay, 334, 4) and 

 >)Indian chestnut red» (Dauthenay, 333, 4) on the back to »burnt sienna)) (Dauthbnay, 

 320, 1) on the hams and »brownish terra cotta)> (322, 4) on the lower flanks, while the 

 animal from Beni might be termed )>rust red» (318, 1 & 2). The chest shows in both 



1 Catalogue of the Ungulate Mammals, Brit. Mus., Vol. II, p. 74. 



2 Ann. Mus. Congo, T. II, Faso. 1, p. 1.5. 



