222 ALLEN’S NATURALISTS LIBRARY. 
1. HUMBOLDT’S WOOLLY MONKEY. LAGOTHRIX LAGOTHRIX. 
Simia lagothrica, Humb. and Bonpl., Obs. Zool., i., p. 322 (1811). 
Lagothrix cana, Id. tom. cit. 1., p. 354 (1811). 
Lagothrix lagotricha, Id. tom. cit. p. 354. 
Lagothrix humboldti, Geoffr., Ann. Mus., xix., p. 107 (1812); 
scl, P!Z, S., 1863, p:. 374, pl. xxxi.; Schl. Mus: ae 
Bas, vii., p. 162 (1876, part.). 
Lagothrix canus, Geoffr., Ann. Mus., xix., p. 107 (1812). 
Gastrimargus olivaceus, Spix, Sim. et Vespert., Bras., p. 39, 
pl. 28 (1823). 
Lagothrix tschudit, Pucher., Rev. et Mag. de Zool., 1857, 
p. 296. 
Lagothrix geoffroyt, Pucher., t. c. p. 297. 
Lagothrix cana, Schl., Mus. Pays Bas, vii., p. 162 (1876; 
part.). 
Lagothrix olivaceus, Spix, ?; Bates, Nat. River Amazon, i., 
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 Guaviaré, a branch of the Orinoco river. It occurs in the 
