222 ALLEN'S NATURALIST'S LIBRARY. 



i. HUMBOLDT'S WOOLLY MONKEY. LAGOTHRIX LAGOTHRIX. 

 Simia lagothrica, Humb. and Bonpl.,Obs.Zool, i., p. 322(1811). 

 Lagothrix cana, Id. torn. cit. i., p. 354 (1811). 

 Lagothrix lagotricha, Id. torn. cit. p. 354. 

 Lagothrix humboldtii, Geoffr., Ann. Mus., xix., p. 107 (1812); 



Scl., P. Z. S., 1863, p. 374, pi. xxxi. ; Schl., Mus. Pays 



Bas, vii., p. 162 (1876, part.). 



Lagothrix canus, Geoffr., Ann. Mus., xix., p. 107 (1812). 

 Gastrimargiis olivaceus, Spix, Sim. et Vespert, Bras., p. 39, 



pi. 28 (1823). 

 Lagothrix tschudii, Pucher., Rev. et Mag. de Zool, 1857, 



p. 296. 

 Lagothrix geoffroyi, Pucher., t. c. p. 297. 



Lagothrix cana, Schl., Mus. Pays Bas, vii., p. 162 (1876 ; 



part.). 

 Lagothrix otivaceus, Spix, ? ; Bates, Nit. River Amazon, ii., 



p. 320 (1863). 



(Plate XX.) 



Characters. Body large and heavy ; face naked, black, and 

 wrinkled ; forehead low, the eyes projecting ; a few scattered 

 white hairs on lips. Hair of under surface hoary, and longer 

 than that of the upper surface. 



Adult Male. General colour blackish, hoary-grey, the hairs 

 being dark grey, tipped with black. Head, chest, hands, under 

 surface of body, and tip of tail, black. Length of the body, 

 from 19 or 20 inches to 27 inches in very large specimens; 

 tail from 24 to 26 inches. 



Young. Hoary grey, darker on the belly and inner surface 

 of the limbs ; hands and top of head black. 



Distribution. This Monkey was discovered by Humboldt on 

 the Guaviare, a branch of the Orinoco river. It occurs in the 



