2 26 Lloyd's natural history. 



the brown woolly spider-monkey brachyteles 



arachnoides. 



Ateles arachnoides, Geoffr., Ann. Mus., vii., p. 271 (1806); 



xiii., p. 90, pi. 9 (1809) ; xix., p. too (1812); Schl, Mus. 



Pays Bas, vii., p. 184 (1876, part). 

 Ateles hypoxanthus^ Desm., Mamm., p. 75 (1820); Neuwied, 



apud Kuhl, Beitr. Zool., p. 25 (1820); Schl., t. c. 



p. 185 (1876, part). 

 Brachyteles macrofarsus^ Spix, Sim. et Vespert., Bras., p. 36, 



pi. 17 (1823). 

 Eriodes hemidactylus and E. tuberifer^ Geoffr., Mem. Mus., 



xvii., pp. 161, 163 (1828). 

 Eriodes arachnoides^ Geoffr., Mem. Mus., t c. p. 160 (1828) 

 Brachyteles arachnoides^ 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 yellowish-brow^n, 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 



