Ixxxviii INTRODUCTION 



Cacajao. 



Range of the Genus. 

 Neotropical Region. 

 Range of the Species. 



194. Cacajao calvus. Angle formed by the union of the Rios Japuri 



and Amazon, Brazil. 



195. Cacajao rubicundus. Forests on the north of River Amazon 



from Iga, on the Rio Iga, westward. 



196. Cacajo melanocephalus. Forests through which the Rio 



Cassiquiari, Rio Negro and Rio Branco flow. 



Saimiri. 

 Range of the Genus. 

 Neotropical Region. 

 Range of the Species. 



197. Saimiri sciureus. French and Dutch Guianas, Venezuela ; and 



both banks of the Amazon and its tributaries, into Colombia. 



198. Saimiri cassiquiarensis. Banks of the Orinoco, south of the 



cataracts to the Rio Cassiquiari and Rio Guaviare ; and 

 forests of Rio Caura, above the rapids of Mura, Venezuela. 



199. Saimiri macrodon. Upper waters of the Amazon in Ecuador 



and Peru. 



200. Saimiri madeira. Middle Rio Madeira, Ecuador. 



201. Saimiri ustus. Peruvian Amazons ; Bolivia. 



202 Saimiri boliviensis. Bolivia in the Sierras Guarayas. 



203. Saimiri b. nigriceps. Eastern Peru. Range unknown. 



204. Saimiri cerstedi. Guatemala? to Panama, Central America. 



AOTUS. 



Range of the Genus. 

 Neotropical Region. 

 Range of the Species. 



20.S. Aotus infulatus. Region of the Upper Amazon, Peru. 



206. Aotus nigriceps. Chanchamayo, Peru. 



207. Aotus senex. Porzuzo, Peru. 



