- i83 - 



on Elgon, has developed from the race living on the plains below 

 the moiintain, presumably S. g. nyansœ^ from which, however, it 

 now differs very plainlj bj its darker and longer fur. Thèse fea- 

 tores are evidently caused as efFects of the harsh climatic condi- 

 tions, which this Duiker has to endure. This animal is thus from a 

 biological point of view very interesting as an exampie of the 

 adaptive changes to which an antilope can be subjected, when it 

 cornes to live in différent natural surroundings. 



Although it does not prevail any doubt as to the origin of the 

 Elgon Bush-Duiker it must now be regarded as a fixed race, 

 because it is in the présent time quite isolated from its congeners 

 living down on the plains. For it must be considered as quite 

 impossible that a communication between the animais on the 

 top of the mountain and those of the plains can take place. It 

 would namely be quite unnatural for a Bush-Duiker to penetrate 

 the forest belt which covers the slopes of the mountain. In consé- 

 quence of this I hâve found it suitable to give the Elgon Bush- 

 Duiker a name which reminds about its habitat. 



Sylvicapra grimmia Roosevelti Heller. 



A young adult female spécimen (n° 778) collected by Major 

 PowELi. CoTTON in the Lado Enclave at Fariola agrées perfectly 

 with Heller's description (') of the colours of this race. This 

 spécimen is, however, a little larger, the length of head and body 

 measured on the prepared skin being about 93 cm. The total length 

 of the skull is 159.5, basai length 137.8, condylo-basal length 149, 

 nasals 54, interorbital breadth 34.2, length of upper tooth-row 

 50.5 length. Thèse measurements agrée thus very well especially 

 considering the différence in sexe. 



Another spécimen (3708) from the northeastern corner of Haut 

 Uele is quite similar in gênerai appearance, only still somewhat 

 darker than the Lado spécimen (coll. Lebrun). 



(') Smitkson. Mise. Coll., vol. 60, n» 8, p. 9. Washington, 1912. 



