68 MAMMALIA. 



differs again from the others in having a slight projection of 

 the thumb, though but for a single phalanx, but Avithout a 

 nail; its hair is totally black. 



A second species the Mikiri^ It. hypoxanthus, Pr. Max.; 



Brachyteles macrotarsus, Spix, pi. i., has also a very small 



thumb, and sometimes even a nail. The hair is yellowish, 



ferruginous towards the tail. These two species are separated 



by Spix under the name Brachyteles. They connect the 



Ateles with Lagothrix. 



The other Ateles to which alone Spix restricts that name 



Coaita, Buff. have no apparent thumb whatever. Such are the 



following: 



A. paniscus; Simia panisc. L. ; Coaita, Buff. XV, 1. (The 

 Coaita.) Completely covered with black hair, like the Chamek, 

 but without any visible thumb; face, flesh-colour. 



Ji. ater, Fr. Cuv. Mammif. (The Cayou.) Face black, like 

 the rest of the body. 



A. marginatus, Geoff. The CImva, Humb. or the Coaita 

 a face bordce, Ann. Mus. XII, pi. 10. Black, with a border 

 of white hairs round the face. 



w3. helzebuth; Sim. beelzeb., Briss. The Marimoncla, Humb. 

 or Coaita a ventre blanc^ Geoff.; Ann. Mus. VII, pi. 16. Black 

 above; white beneath; circumference of the eyes flesh-co- 

 loured. 



w5. arachnoides, Geoff. Ann. Mus. XIII, pi. 9. (The Spider 

 Monkey.) Fawn-coloured or red; eyebrows black. 



All these animals are natives of Guiana or Brazil; their 

 fore-feet are very long and slender, and their gait remarkably 

 slow.(l) 



Lagothrix, Geoff. Gastrimargus, Spix. 



Head round, like the Ateles ; a thumb like the Alouattes; tail 

 partly naked, like the one and the other. Such are the Z. Humbol- 

 diiy Geoff.; the Caparo, Humb.; Gast. olivaceus, Spix, pi. 28 (The 

 Capparo); and ?Ae Grison; Lag. canus., Geoff.; Gastr. infumatus, 

 Spix, 29. (The Silver-haired Monkey.) Monkeys from the interior 

 of South America, said to be remarkable gluttons. 



The other Sapajous (Cebus, Geoff.) have a round head, distinct 

 thumbs, and the tail hairy, though prehensile. The species are 

 more numerous than those of the Alouattc, and are characterised 

 with nearly as much difficulty. 



(1) They exhibit some remarkable resemblances to man in their muscles. Of 

 all animals, Ihey alone have the biceps of the thigh made like his. 



