1880.] 



MR. W. A. FORBES ON THE UAKARI MONKEYS. 



64/ 



Opposite Fonleboa, moreover, is exactly the localit}' where the 

 French expedition obtained B. culvus, and is well within the limits 

 assigned to that species by Castelnau. 



B. rubicundus is the western representative of B. calcus, which 

 it very closely resembles, but can at once be distinguished by its 

 very different coloration, being nearly all over of a rich deep 

 chestnut, only paler on (he neck, instead of the pale sandy-white, 

 slightly rufous below and on the inside of the limbs, of the last 

 species. The fact of the series of individuals of each of these species 



Fig. 11. 



Map of part of the basin of the Amazons, to show llic distribution of the 

 Uakari Monkeys. 



Supposed area of B. melanocephalus. 

 >, ,, B. calvus. 



!> „ ■ B. rubicundus. 



obtained by Castelnau and Deville differing to no important extent 

 amongst themselves, as well as their different ranges, clearly show 

 that, so far as our knowledge yet goes, there is no reason whatever 

 for considering B. calvus an albino form of B. rubicundus ; more- 

 over in B. calvus a considerable number of hairs on the back &c. 

 are 6/«c^- throughout, just as in B. rubicundus ; this would hardly 

 be the case in an albino. 



Gray's arrangement of these species in the 'Catalogue of 

 Monkeys' has already been dealt with by Schlegel : — " II semble, 

 d'ailleurs, que ce savant se soit forme une ide'e a lui propre de ces 

 animaux, puisque, aprus avoir mis les OuaJcaria rubicunda et 

 calva dans une categoric a part, Jaquelle porte en tete : ' pelage 

 blanchatre on rougeatre,' il ajoute : 'albinos de V Oualaria mela- 

 nocephala.'' On avouera que ceci est trop fori iwur le directeur d'u)i 

 des plus grands etablissements de Zoologie." (Mus. P.-B. p. 229). 



