KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 58. N:0 2. 91 



The knowledge about the skull of this Duiker appears to be rather imperfect. Tho- 

 mas has recorded 1 the basal length and greatest breadth of »le plus grand cråne » out of 

 two belonging to an adult pair c? & ?. The former of these measurements was 161 

 mm., the latter 83 mm. The skull of the adult female in this collection has the following 

 dimensions: 



Greatest length 189 mm. 



Basal length 167,5 



Zygomatic breadth 86,5 



Breadth of brain-case 58 



Interorbital vvidth 46 



Length of nasals 76 



» » rostrum from orbits 96 



» » upper molar series 56 



Breadth of m' 13,5 



Length of bullan 27 



Breadth of palate outside m 2 60 



This skull is evidently somewhat larger than Thomas's largest specimen. 



The nasals are pointed behind in such a degree that their posterior portion which 

 is embraced by the processus nasales from the frontals forms a equilateral triangle. Their 

 upper surface like the whole forehead is flat, very different from that of C. c. castaneus, 

 weynsi etc. (ef. Pl. XI). The median posterior palatal emargination is narrow, but 

 reaches much further forwards than the lateral ones. The premaxillaries reach the nasals 

 (Pl. XI, fig. 1). 



In the young skull from the same place (with a total length of only 154 mm.) the 

 posterior suture of the nasals is rounded off, but the processus nasales from the frontals 

 project on both sides in a similar degree as in the adult. The posterior choanae stånd 

 morc broadly open in the young than in the adult. The molar series of the adult $ is 

 not much curved, the distance between the inner sides of m 3 being about 35 mm., and that 

 between p 1 about 26 mm. 



The horns (Pl. XI, fig. 1) are rather slender, conical and sharply pointed. 3 Their 

 length in the adult female is 50 mm., and their greatest diameter near the base is 11 mm. 

 They are not worn on their upper surface. From this fact and the colour of the animal 

 it may be assumed that this animal does not live in the thick forest. 



The description of the colour of this species in the literature is not very complete, 

 and it is thus connected with great difficulty to decide whether the specimens from Beni 

 are quite identical with the typical form from Gabun. The latter is described as »dull 

 chestnut rufous», but since Thomas had had the opportunity of seeing adult specimens 

 he adds (1. c.) that they are »un peu plus bruns sur la region antérieure du corps que le 

 type encore jeune ». These latter specimens were, however, from the Stanley Falls district, 



1 Ann. Mus. du Congo, T. 11 Fasc. 1. 



- This is in agreement with 1h<' description of (lic type specimen in »The Book of Antelopes». The horns of 

 this Antelope are thus very different from thoso of C. ogilbyi, although Knottnertjs-Meyer unites both into one 

 of his many genera and says about the same: »Die Hörner sind, besonders beim Männchen, dick und gross. » (Arch. 

 f. Naturgesch. 1907). 



