— I20 — 



The lower side of the tail is grev vvith sharp line of démarcation. 



Unfortunatelv there is no skull to the spécimen. 



From the description above mav be seen that this prettv little 

 Gnenon from Ruwenzori is very similar in colour to the typical 

 foi in from Benito river, Kamerun. The small diflerences f. i. the 

 black marks an the forehead, the absence of yello\v belovv the 

 tail, etc., may, however, together with the verv great distance in 

 geographical distribution suffice as reason for the establishment of 

 a new subspecies, which I take the pleasure of naming after the 

 coUector, Mr. André Pilette. 



The discovery of a Talapoin on Mt. Ruwenzori is of very great 

 zoogeographical interest, and it is one of the examples which hâve 

 been forthcoming during later years, as well among mammals (') 

 as among birds, proving that the West African forest-fauna for- 

 merly has had a much wider and continuons distribution. The 

 remuants of this fauna are now in some cases scattered wide apart 

 and show a so to say « insular » distribution. A rather striking 

 instance of such one is offered bv the three known Talapoin 

 tonns, one at Benito river, S. Kamerun, and at Como, Gaboon, a 

 second at Canhoca, Angola, and the third now reported from 

 Ruwenzori. Such an « insular » distribution which is known for 

 several birds as well as mammals has, of course, once been conti- 

 nuous but has been broken bv the change of the natnral condi- 

 tions. The relicts hâve been able to survive up to the présent time 

 onlv in such place, where either no change has taken place, or 

 where it has not been greater than that the animais could adapt 

 themselves in accordance with the same. 



Erythrocebus. 



This genus is in the collections from Congo onlv represented 

 by the type spécimens of 



Erythrocebus patas po'ioinystax Matschie, n° 568, Uele, and 

 Erythrocebus patas albosignatus Matschie, n° 15, Uele. 



(') F. i. Idiuriis A\. MaMsi yK. Wt. Akad. Handl., Btl. 5S. n» 2, Siockholni, 1917). 



