ON THE „DIANA* AND THE ,,ROLOWAY." 233 



NOTE XXXV. 

 ON THE „DIANA" AND THE „ROLOWAY' 



BJT 



Dr. F. A. JENTINK. 



November 1898. 



Since more thau a century the » Diana" has become such 

 a well known Moukey that every child can show it you 

 in every Zoological Garden. Therefore it may be called 

 somewhat hazardously to move the supposition that — 

 although it seems to be so familiar an animal to children — 

 it has always been misunderstood by naturalists and 

 scientific authors. 



In our collection there are 9 specimens (among them 

 2 from the Gold-coast and 4 from Liberia) all labeled 

 Cercopithecus diana. Some weeks ago Mr. Oscar Neumann, 

 the excellent German Africa-traveller, told me that he 

 had observed some differences between our Liberia- and 

 Gold-coast-specimens , differences suflBciently striking to 

 regard upon them as two distinct species. I now have 

 studied the thing and believe to be able to explain the 

 question exactly. 



The Gold-coast-specimeus have a long white beard and 

 the inner side of thighs white or whitish ; the Liberia- 

 specimens, however, present a short white beard and the 

 inner side of thighs is bright red-bay. There are still more 

 differences as I will show furtheron. Now the question 

 rises, which of the two species is the true »Diana^"? 



Notes from, the Leyden IVIu.seuixi , Vol. XX!. 



15** 



