KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:0 5. 



165 



patch on the crown is present in both races. The colour of the face is fawn with 

 a dusky blaze in the Guaso Nyiri race (PI. XIV fig. 3), more bright rufous in the 

 Kilimanjaro specimens. The colour of the outside of the ears is »dark fawn* in my 

 specimens, »buff» in those from Kilimanjaro, the terminal portion is black in both. 

 The mesial dark dorsal streak is in consequence of the general dark colour not very 

 apparent before it becomes black on the rump, and it is continued on the tail, where 

 it, however, is concealed in the bucks by the long white hairs on the terminal por- 

 tion of this organ. The black stripes on the buttocks, and the black tufts on the 

 hind legs are developed as usual. The black spots as well on fore as hind legs in 

 the place where the lateral hoofs are situated in other antelopes, and the black spot 

 on the heel are perhaps more pronounced than in the Kilimanjaro race. 



These differences in colour between the Impalas from Guaso Nyiri and Kili- 

 manjaro are also supported by cranial differences as the following measurements 

 indicate. 



Basicranial length 



Condylobasal length 



Greast breadth 



Ititerorbital breadth 



Greatest length of nasals 



Greatest breadth of nasals 



Breadth of nasals at the end of the nasopremaxillary suture 



Distance from orbit to tip of premaxillary 



Length of upper molar series 



The length of the horns of my two Impala bucks, which are to be regarded 

 as good average specimens, measure about 73 and 66 cm. along the front curve and 

 the distance from tip to tip is resp. 43 and 53 cm.* 



The Impalas of German East Africa appear to be smaller with shorter and 

 specially narrower nasals. The difference is not very great, but I think it is the 

 best proceeding to name the Impala of the thornbush country north of Guaso Nyiri 

 as a separate geographic race which is called rendilis after the nomadic tribe inha- 

 biting this country. Concerning the colour it could almost have been expected that 

 the inhabitants of this arid region should have been paler instead of being rather 

 darker. 



^ The spread of the horns is, as is well known, very variahle, and sometimes one of the tips is nearer 

 the median line than the other. A good example of this was an Impala which I saw in Nairobi and which probably 

 was from Sotik. The spread of this was not less than 68 cm., but the tip of the right horn was only about 

 25 cm. from the median line. — Some ultramodern zoologists would probably term such a specimen a hybrid! 



