226 ALLEN’S NATURALIST’S LIBRARY. 
THE BROWN WOOLLY SPIDER-MONKEY. BRACHYTELES 
ARACHNOIDES, 
Ai‘eles arachnoides, Geoffr., Ann. Mus., vil, p. 271 (1806); 
XliL, p. 90, pl. g (1809) ; xix., p. 106 (1892); Schl., Mus. 
Pays Bas, vil., p. 184 (1876, part.). 
Ateles hypoxanthus, Desm., Mamm., p. 75 (1820); Neuwied, 
apud. Kuhl, Beitr. Zool., p. 25 (1820); Schl, tage 
p. 185 (1876, part.). 
Brachyteles macrotarsus, Spix, Sim. et Vespert., Bras., p. 36, 
pl. 17 (1823). 
Lriodes hemidactylus and £. tuberifer, Geoffr., Mém. Mus., 
XVli., pp. 161, 163 (1828). 
Eriodes arachnoides, Geoffr., Mém. Mus., t. c. p. 160 (1828) 
Brachyteles arachnotdes, Gray, Cat. Monkeys Brit. Mus., p. 45 
(1870). 
Characters.—Male.—Size small; face nude, flesh-coloured; general 
colour of body yellowish-brown, darker on the back of the head, 
with a few long black hairs on the forehead ; hairs of head short 
and directed backward ; buttocks, vent, base of tail and perineal 
region dark ferruginous-brown ; the thumb wanting or rudi- 
mentary. Length of body, 22 inches; tail, 26 inches. 
Female—Ashy-brown, instead of yellewish-brown, in appear- 
ance. 
Young.—In some young specimens the general colour is dark 
brown, with the sides of the face white. 
Dr. Slack observes, in the ‘‘ Proceedings of the Academy of 
Natural Sciences of Philadelphia” for 1862, in reference to 
this species: “I had long suspected that the three species 
of this genus described by Isidore Geoffroy St. Hilaire, were 
in reality one and the same; no specific characters are mani- 
fest in their coloration, or skulls, the supposed differences being 
mil 
