68 MAMMALIA. 
differs again from the others in having a slight projection of 
the thumb, though but for a single phalanx, but without a 
nail; its hair is totally black. 
A second species the Mikiri, At. hypoxanthus, Pr. Max.; 
Brachyteles macrotarsus, Spix, pl. 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 Bracuyreres. They connect the 
Atéles with Lagothrix. 
The other ArreLes to which alone Spix restricts that name— 
_ Coaita, Buff.—have no apparent thumb whatever. Such are the 
following: 
A. paniscus; Simia panise. L.3 Coaita, Buff. XV, 1. (The 
Coaita.) Completely covered with black hair, like the Chamek, 
but without any visible thumb; face, flesh-colour. — 
A. ater, Fr. Cuv. Mammif. (The Cayou.) Face black, like 
~~ the rest of the body. 
A. marginatus, Geoff. The Chuva, Humb. or the Coaita 
a face bordée, Ann. Mus. XII, pl. 10. Black, with a border 
of white hairs round the face. 
“a A. belzebuth; Sim. beelzeb., Briss. The Marimonda, Humb. 
or Coaita & ventre blanc, Geoff.; Ann. Mus. VII, pl. 16. Black 
. above; white beneath; circumference of the eyes flesh-co- 
loured. 
1. arachnoides, Geoff. Ann. Mus. XIII, pl. 9. (The Spider 
Monkey.) Fawn-coloured or red; eyebrows black. 
, All these animals are natives of Guiana or Brazil; their 
. uf _ fore-feet are very long and slender, and their gait remarkably 
* » slow.(1) 
Lacornurix, Geoff.—Gastrimarecus, 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- 
dii, Geoff.; the Caparo, Humb.; Gast. olivaceus, Spix, pl. 28 (The 
Capparo); | and the Grisons re canus., Geofl.; Gastr. infumatus, 
Spix, 29. (The Silver-haired Monkey.) Monkeys from the interior 
of South America, said to be remarkable gluttons. 
The other Sapajous (Czsus, Geoff.) have a round head, distinct 
thumbs, and the tail hairy, though prehensile. The species are 
more numerous than those of the Alouatte, and are He ck ; 
with nearly as much difficulty. .* 
‘ a) 
(1) They exhibit some remarkable resemblances to man in théir muscles. of 
all animals, they alone have the biceps of the thigh made like his. 
