KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 58. NIO 2. 87 



some dark shades in the middle without that any distinct ventral stripe, or patch is 

 formed. All över the body the pelage is better developed and less close than in the Beni 

 specimen. The legs and feet are darker in the specimen from Kabwe without, however, 

 becoming black. Therefore the black stripe from the heel, as well as that of the front 

 side of the tarsus 1 can be discerned in the dark brown general colour of the feet. The 

 tail has basally the colour of the back, the tuft is black, mixed with white at the tip and 

 on the lower side. 



As far as these specimens mentioned above can be regarded as typical, it is very 

 easy to distinguish the two races of C. weynsi already by their different colour. 



The cranial differences may, however, be regarded as more important and those 

 may be seen from the following table of measurements and the figs. 1 and 2 of Pl. X. 



The horns of the specimen from Beni measure about 56 mm. (great est diameter 17), 

 those of the specimen from Kabwe 49 — 50 mm. (greatest diameter 16 mm). They are 

 rather similar, with a bluntly conical tip followed by an indistinctly ringed portion on 

 which more or less plainly about five transverse rugosities may be traced. The basal 

 portion is somewhat depressed, or obliquely compressed. It has an uneven surface, 

 but without rings. 



At the same place and the same day ( 29 / 3 1914) another specimen of Duiker was 

 collected by Captain Arrhenius in the mountain-forest of Kabwe. This specimen which 

 also is an old female differs so strongly with regard to colour from the one described 

 above that at first I was inclined to believe it a representative of another race (perhaps 

 C. johnstoni which is stated to be much darker than weynsi). A closer examination of the 

 skulls of the two Kabwe Duikers revealed, however, that these with regard to their 

 general appearance and dimensions were so alike that they could not be separated. This 

 is very plainly proved by the following table of measurements. The only difference, 

 which is worth mentioning, is that the length of the upper molar series is somewhat 

 longer in the dark specimen. This is, however, very easily and naturally explained by the 

 fact that the teeth in the first described specimen are more worn, indeed almost worn 

 out, and therefore this dimension secondarily has become shortened. Judging from the 

 likeness of the skulls I must thus refer the darker specimen as well to C. weynsi rutshuri- 

 cus, and regard it as somewhat melanistic. This makes itself apparent by the general 

 darkness which is produced by dark hairs mixed among the »red », or by black tips to some 

 hairs. The whole of the före quarters is thus a dark shiny brown, which gradually behind 

 the shoulders is more and more enlivened by a sprinkling or grizzling with rufous. Thence 

 it shades gradually from something like madder brown on the back, to a saturated rust red 

 on the hams. Along the middle of the chest towards the navel is a broad band of 

 »warm sepia» on the sides surrounded with a paler brown, somewhat similar to »burnt 

 umber ». The head and the legs are similar to the other specimen, only a little darker. 

 The same is the case with the tail. 



The horns of the melanistic specimen are of the same type as in the other, but more 



1 These stripes are present in a number of species of Gephalophus as f. i. C. elaudi, leucogaster, tveynsi, 

 johnsioni e!c. 



