288 PIT HECIA 



GEOGRAPHICAL DISTRIBUTION OF THE SPECIES. 



On the northeastern corner of South America in French Guiana, 

 two species of this genus are found, one P. capillimentosa not having 

 been, as yet, procured elsewhere ; the other P. pithecia with a wider 

 known range, being a resident of British Guiana for 300 miles into the 

 interior, (Sclater, Proc. Zool. Soc. Lond., 1866, p. 305) ; and Guiana 

 possesses two additional species, P. satanas and P. chiropotes, rang- 

 ing on the Upper Orinoco, Rio Tocantins and Rio Negro; the first 

 named having been obtained at Para ; the latter also on the Rio Branco, 

 Brazil, and, according to Bates, it goes to Peru. On the Upper 

 Amazon near Ega on the Solimoens P. albicans was procured, its 

 range unknown ; and on the banks of the Rio Negro near Barra P. 

 chrysocepiiala occurs. At or near Santarem on the Lower Amazon 

 P. albinasa was found. The most extensive known range of any of 

 the species is that of P. monacha, which occurs on both banks of the 

 Upper Amazon, on the Rio Negro, Rio Madeira and Rio Marmore, in 

 the vicinity of Tabatinga on the Rio Solimoens, and into Peru, where 

 it has been procured on the Rio Javari and Rio Ucayali. The species 

 has also been obtained on the Rio Marona in Western Ecuador. 



KEY TO THE SPECIES. 



A. Size large. 



a. Hair of head long, projecting forward on face. 

 a.' Color black, hairs tipped with white, hands 



and feet grayish white P. monacha. 



b.' Color clove brown, some hairs white tipped, 



hands and feet black P. capillimentosa. 



c! Back and tail only black, rest whitish P. albicans. 



b. Hair of head short, not projecting on face. 



a.' Head white P. pithecia. 



b.' Head ochraceous buff P. chrysocephalus. 



c! Head black, nose scarlet, tip black P. albinasa. 



B. Size small. 



o. Back black, washed with brown P. satanas. 



b. Back golden brown P. chiropotes. 



Pithecia monacha E. GeofFroy. 



Pithecia monachtis E. Geoff., Ann. Mus. Hist. Nat. Paris, XIX, 

 1812, p. 116; Id. Cours Hist. Nat. Mamm., 1828, p. 24, lOme 



