56 LAGOTHRIX 



GEOGRAPHICAL DISTRIBUTION OF THE SPECIES. 



The majority of the species of Lagothrix are found in the 

 western portion of Brazil, in the forests of the Upper Amazon and its 

 tributaries. L. lagotricha ranges from the banks of the Rio Gua- 

 viare, a branch of the Orinoco, to the district southwest of the Rio 

 Negro, and on the Upper Rio Magdalena, Colombia, to Chanchamayo 

 in Peru, from which place specimens now in the British Museum were 

 brought by Kalinowski. Near the mouth of the Rio Tocantins, Brazil, 

 L. CANA occurs, and goes westward to the forests watered by the Rio 

 Solimoens and Rio lea. In the mountains, north of Tolima, Ecuador, 

 at an elevation of 5,000 to 7,000 feet L. lugens was procured ; and on 

 the banks of the Rio Copataza, and near Macas in Ecuador, and also in 

 the valley of the Peruvian Amazons, L. infumata is found. In the 

 forests through which the Rio Juara flows near Barrigudo, L. uberi- 

 COLA was obtained, extending its range into Peru, and also along the 

 Rio Solimoens; and at Callanga, Department of Cuzco, Peru, L. 

 THOMASi is found. 



KEY TO THE SPECIES. 



A. Body thick, heavy; fur woolly; tail long. 



a. General color blackish hoary gray, or bluish 



gray L. lagotricha. 



b. General color dark purplish brown L. lugens. 



c. General color grizzled gray and ochraceous . . . .L. thomasi. 



d. General color grizzled wood brown L. ubericola. 



e. General color dark reddish brown ; under 



parts black L. infumata. 



f. General color buflfy gray ; under parts ochraceous. . . .L. cana. 



Lagothrix lagotricha (Humboldt). 



Simia lagotricha Humb., Rec. Obs. Zool., I, 1811, (1815), pp. 

 322, 354. 



Lagothrix humboldti E. Geoff., Ann. Mus. Hist. Nat. Paris, XIX, 

 1812, p. 107; Id. Cours Hist. Nat. Mamm , 1828, p 35, 9me 

 Leqon; I. GeoflF., Cat. Primates, 1851, p. 50; Pucher., Rev. 

 Mag. Zool., 1857, p. 292; Slack, Proc. Acad Nat. Scien. Phil., 

 1862, p. 514; Reichenb., Vollstand. Naturg. Affen, 1862, p. 

 78, figs. 173, 175; Sclat., Proc. Zool. Soc. Lond., 1863, p. 374, 

 pi. XXXI; Bates, Nat. Riv. Amaz., II, 1863, p. 320; von 



