228 MR. P. L. SCLATER ON ANIMALS IN THE MENAGERIE. [Mar. 7, 



on the Rio Negro and Rio Brancho, Wagner has shown that P. rufi- 

 venter, Geoffr. (Gray Cat. Monkeys, p. 60), is really the female of 

 P. leucocephala *. 



My own opinion is that Wagner, although somewhat prone to 

 unite species, can hardly have been mistaken on this point. I am 

 therefore inclined to regard it as possible that P. chrysocephala may 

 he the male of a closely allied but distinct species, probably occupying 

 a different geographical district. It seems to differ from P. leuco- 

 cephala not only in its yellow head, but in the narrow black line 

 which parts the middle of the forehead. The specimen in the 

 British Museum was purchased at Stevens's sale-rooms in 1842, and 

 was said to have been received from the " Rio Negro." 



10. PlTHECIA SATANAS. 



In March 1864 we purchased a young female American Monkey 

 from a London dealer, along with a lot of other animals received, 

 I believe, from Para. I was inclined to think it might be the 

 young of Pithecia satanas (Hoffm.), and gave notices of it in the 

 Society's 'Proceedings' under that name (1864, pp. 138, 712), and 

 a figure (plate xli.). The specimen died, and is now in the British 

 Museum. 



On the 30th of March 1868, we purchased of another dealer a 

 second young example of the same Monkey, which I also recorded 

 as P. satanas (?). This animal died November 14th of the same 

 year, and is likewise now in the British Museum. 



Upon these two examples Dr. Gray has established a new species, 

 his Chiropotes ater, Cat. Monkeys (1870), p. 61. 



I have recently reexamined these specimens in the British Museum, 

 and, after comparison of them with the other specimens in that col- 

 lection, have found no reason to alter my determination. The con- 

 dition of the skulls shows that the animals were both quite im- 

 mature. 



There seem to be two nearly allied species of this form of Pi- 

 thecia : — 



(1) Pithecia chiropotes (Humb.). 



Simia chiropotes, Humb. Obs. Zool. i. p. 312. 

 Simia sagulata, Traill. 

 Brachyurus israelita, Spix. 

 Pithecia chiropotes, Geoffr. et auctt. 



Diagn. — Major : nigra : dorso castaneo : barba maris adulti in- 



crassata maxima. 

 Hab. Upper Orinoco (Humb.) ; Rio Negro (Spix) ; British 

 Guiana (Schomb.) ; Rio Brancho (Natt.). 



(2) Pithecia satanas (Hoffm.). 



Simia satanas, Hoffm. ; Humb. Obs. Zool. i. p. 315, tab. xxvii. 



Chiropotes couxio, Less. 



* Cf. Wagner, Abh. Ak. Miinch. v. p. 4'3C\ et Saugeth. v. p. 97. 



