THE SPIDER-MONKEYS. 233 
Humboldt, which is the most beautifully coloured of its 
group, is said to go about in small parties, passing through 
the forest ata rapid rate, feeding on different kinds of berries. 
II. GEOFFROY’S SPIDER-MONKEY, ATELES GEOFFROYI. 
Ateles geoffroyt, Kuhl, Beitr. Zool., p. 26 (1820) ; Schl., Mus. 
Pays Bas, viil., p. 181 (1876); Alston, in Godman and 
Salvin, Biol. Centr. Amer. Mamm., p. 8 (1879). 
Ateles melanochir, Desmar., Mamm., p. 76(1820) ; Gray, Cat. 
Monkeys Brit. Mus., p. 43 (1870); Sclater, P. Z. S., 1871, 
p. 226, pl. xv., 1875, p. 419, pls. xlviii. and xlix. 
Eriodes frontatus, Gray, Ann. Nat. Hist., x., p. 256 (1842) ; 
mee oy. HOS. “Sulphur,” Zool,, p: 9, pli Sel. 
P..Z. S., 1832, p. 186; Von Frantzius, Arch. f. Naturg., 
BEXV., LOOQ, Pp: 257, 259. 
Sapajou geoffroyi, Slack, Pr. Ac. Sc. Philad., 1862, p. 511 
(= female). 
Ateles variegatus (nec Wagn.), Von Frantzius, Arch. f. Naturg., 
PAV. 5 1900, P.1257- 
Ateles hybridus, A. ornatus et A. albifrons, Gray, Cat. Mon- 
keys Brit. Mus., pp. 43 and 44 (1870). 
Characters.— Body light greyish-drab all over ; hands, elbows, 
feet, knees, and the upper side of the extremity of the tail, 
black ; face black, with the exception of the lips and a ring 
round the eyes, broad above and narrow below, flesh-coloured. 
Hair of forehead reflexed, meeting that of the crown above 
the eyes, forming a triangular patch of erect black hairs. ‘Top 
of the head and upper part of the tail buff. Length of body, 
17 inches ; of tail, 21 inches. ‘Thumb entirely wanting. 
This species is remarkably variable. ‘The description given 
above belongs to the form described as A. melanochir by Des- 
