ATELES. MAMMALIA. 51 



vex and shott ; tail extremely long, strongly prehensile, hav- 

 ing a part without hair, and covered with a delicate skin 

 towards its extremity. 



These apes are slow in their movements, and live in monogamy, bringing forth 

 only one young at a time. 



* With a very little nailed thumb on the hands, or a rudimentary 

 thumb without a nail. 



A. kypoxanthus, Kuhl, Desm. Fur yellowish gray ; face flesh- 

 coloured, spotted with gray ; base of the tail and anal region 

 sometimes of a ferruginous yellow ; a little strong and short 

 thumb with a nail on the hands. About two feet long, and the 

 tail nearly the length of the body. Inhabits Brazil. 



A. subpentadactylus, Geoff. Fur entirely black ; a very little 

 thumb without a nail on the anterior hands. About a foot and a 

 half long; tail much longer than the body Inhabits Guiana. 



** No trace of thumb on the anterior hands. 



A. pani&cus, Geoff. (Simiapanisca,Lin.) The Coaita. Fur entire- 

 ly black ; no thumb on the anterior hands. Inhabits Guiana, 

 Brazil, &c Shaw, i. pi. 28. 



Var. A. Orbit projecting above ; partition of the nostrils narrow ; all the head 

 naked except a few hairs on the middle of the forehead. From Surinam. 



Var. B. Obritary partition little projecting, nostrils widely separated, face black, 

 head furnished with hair Cayenne. 



In this species the prehensile tail is nearly a foot longer than the body of the ani- 

 mal, and nearly answers all the purposes of a hand. The prehensile part of the tail 

 is naked, and has a covering of very delicate skin. In all its movements the animal 

 entwines this tail round the objects near it, draws things towards him too remote to 

 be reached by his hands, and suspends himself by the same organ from the branches 

 of trees. 



A. bchebuth, Geoff. The Marimonda. Fur black ; belly of a 

 dirty white or yellow in the males, white in the young and fe- 

 males. About 16 inches in length. Inhabits the banks of the 

 Orinoco, living in troops Ann. Mus. vii. pi. 16. 



A. marginatus, Geoff. The Chuva. Fur black ; a white ruff 

 around the face. About 16 inches in length. In the adult male 

 the ruff of hair yellowish ; white in the females. Common on 

 the banks of the rivers Santiago, and Amazons. Ann. Mus. xvii. 

 pi. 9. 



A. arachnoides, Geoff. The Spider Monkey. Fur of a gray fawn- 

 colour, very soft ; eyebrows long and black - 9 no thumb on the 

 anterior hands. Inhabits Brazil.- Ann. Mus. xiii. pi. 9. 



A. melanochir, Desm. Fur gray ; top of the head, extremities of 

 the four members, and an oblique spot on each knee of a brown 

 black or gray colour. About 13 inches long. 



Gen. 10. LAGOTHRIX, Geoff. Humb. 

 Incisors f , canines }-}, molars |-f , = 36. Head rounded ; 



