- ii8 — 



In spite of the fact the several names hâve been given to Guerezas 

 froin varions parts of the Congo forest. I venture to inchide ail 

 thèse spécimens iinder the above name. It is of importance to 

 remember that the development and appearance of the tail is 

 individually différent. This is partly due to the simple fact, that 

 the tail tuft is subjected to be stronglv worn. Among thèse spé- 

 cimens there are some vvhich hâve only comparatively short hairs 

 at the end of the tail, but a doser examination of thèse will reveal, 

 that the hairs are ail broken and worn, and thus bave been conside- 

 rably longer. Another thing is, that at one and the same locality 

 spécimens may be obtained in which the extension of the clothing 

 with white hairs along the end of the tail is quite différent. To 

 prove this the following facts may be quoted about three spécimens 

 which ail bave been collected at Moera by Christy ('). In n" 6i8 

 the tail is clothed with white hair along 32 cm. of its end, in 

 n° 641 this same measurement is only about 22 cm., and finally 

 in n° 626 the white hairs grow only along 15 cm. of the end of 

 the tail. Nevertheless this last one is an adult and well develo- 

 ped maie spécimen. Of two spécimens from Sangha ne (n" 3492) 

 has short and worn white hair along approximately 19 cm., and 

 the other (n° 3491) rather long hair along 26 cm. of the tail, and 

 so on. 



This does not hinder, that in certain localities where the 

 Guerezas bave plenty of suitable food, and other conditions of 

 life well filled, larger and finer spécimens with perhaps more often 

 extensive tail-tufts may be developed than in others, where food 

 is more scanty, or of less nourishing quaiity. But if thus perhaps 

 the Guerezas of the primeval forest displav a somewhat more 

 luxuriant growth than in some detached, or outlving forests, this 

 cannot be regarded as justifying the establishment of subspecies, 

 because it is not a constant enough quaiity. Still less this is the 

 case with features of individual variation. 



(') Conf. also : Lônnberg, A'. Vtl. Akad. Handl., vol. 58, n» z, pp. 27-28. 



