646 MR. W. A. FORBES ON THE UAKARI MONKKYS. [NoV. 30, 



the first of these the water-colour drawing hy Richter in the 

 Society's possession, wliich is here reproduced on a diminished 

 scale (Plate LXIIL), was taken. In all probability it is the 

 skin and skeleton of this individual which are now preserved in 

 the British Museum. [The stuffed skin is marked " Zool. Soc.'s 

 collection," the skeleton 806 5.] 



b. Facie rubra. 



2. Brachyurus calvus. 



Brachyurus calvus, Isid. Geoffr. C. R. xxiv. p. 576 (1847), et 

 Arch. Mus. v. p. 560; Exped. Amer. Sud, Mammif. p. 17, pi. 4. 

 fig. 1 (1855). 



Ouakaria calvus (sic), Gray, P. Z. S. 1849, p. 10. 



Ouakaria calva. Gray, Cat. Monk. p. 62 (1870). 



Pithecia calva, Schl. Mus. P.-B. vii. p. 22S (18/6). 



Plthecia alba, Schl. Mus. P.-B. vii. p. 229 (18/6). 



Corpore falvido-albicante, subtus saturatiore. 



Hal. Opposite Fonteboa {Castelnau ^' Deville) ; banks of the 

 Japurti delta, west of its tnouth (Bates). 



According to Castelnau (/. c. p. 567), B. calvus is confined to the 

 forests lying on the north bank of the Amazons, between the rivers 

 Putumayo (or lea) and Japura. 



The locality "Para," given to the species by its discoverer 

 M. Lisboa, and also marked on the mounted specimen in the 

 British Museum, is of course a mistake, as already pointed out by 

 Schlegel (7. c. p. 226). Mr. Bates's notes on this species and the 

 next, and their distribution, are well known to naturalists. On 

 his short description and the figure in the second edition of the 

 'Naturalist,' Prof. Schlegel has attempted to found a fourth species, 

 "Pithecia alba." But, in the first jdace, the short description 

 given, as well as the locality, suit B. calvus quite well ; and, 

 secondly, there is a specimen in the British Museum, purchased 

 of Stevens, which in all probability was one collected by Mr. Bates 

 himself, and is quite the same as three other specimens of that species. 



3. Brachyurus rubicundus. (Plates LXI., LXII,) 



Brachyurus rubicundus, Isid. Geoffr. & Dev. C. R. xxvii. p. 498 

 (1848); Geoffr. Arch. Mus. v. p. 5G4, pi. 30; Exped. Am. Sud, 

 Mamm. p. 19, pi. 4. fig. 2 (head). 



OuaJvaria rubicunda. Gray, Cat. Monk. p. 62 (1870). 



Pithecia rubicunda, Schlegel, Mus. P.-B. vii. p. 228 (1876). 



Corpore castaneo-rufo, collo pallidiore. 



Hub. Forests on the north bank of the Amazons opposite Oli- 

 venca, not passing eastwards of the lea (Castebiau). 



The exact westward extension of this species still remains un- 

 known. The young specimen seen at Fonteboa by Bates (/. c. p. 3 1 3) 

 and by him referred to this species, was more probably B. calvus, 

 as we know, from Geoffrey and Castelnau's account, that the young 

 of B. rubicundus resembles in coloration the adult, and is not paler. 



