QUADRUMANA. 59 



ears, which are partly hidden under the hair. One species only is 

 known. 



Nocth. trivirgata, Fred. Cuv., Mammif. ; Nyctipith. vociferans, 

 Spix, pi. 18. (The Douroucouli). Ash-colourcd above, fawn-co- 

 loured beneath; a black vertical line on the middle of the forehead, 

 and one on each temple. It is a nocturnal animal of South Ame- 

 rica*. 

 They are all from Guiana or Brazil. 



OuisTiTis(«).— Hapale, Illig. — Arctopithecus, Geoff. 



A small genus, similar to the Sakis, and for a long time confounded with 

 them in the great genus of monkeys. In fact, like the generality of the 

 American monkeys, they have the head round ; face flat ; nostrils lateral ; 

 buttocks hairy ; no cheek-pouches, and, like the Sakis in particular, the 

 tail not prehensile. They have only, ho'vvever, twenty grinders, like the 

 monkeys of the ancient continent; all their nails are compressed and 

 pointed, those of the hind thumbs excepted, while their anterior ones are 

 so slightly separated from the fingers, that it is with hesitation we assign 

 to them the name of quadruraana. They are all pretty little creatures, of 

 agreeable forms, and easily tamed. 



M. Geoffroy distinguishes the Ouistitis, properly so called, which he 

 names Jacchus, and whose peculiar characters are pointed inferior in- 

 cisors, arranged on a curved line, equal to the canines. Their tail is an- 

 nulated and well covered with hairs ; the ears generally ornamented with 

 a hairy brush. 



Sim. jacchus, Lin. ; in Paraguay the Titi, BufF. XV. pi. 24. 



(The Common Ouistiti). Tail tolerably well tufted, coloured by 



rings of bromi and white ; body greyish-brown ; two large tufts of 



white hairs before the ears. From nearly every part of South 



America-j-. 



M. Geoffroy calls those species which have inferior trenchant incisors 



placed nearly in a straight line, and less than the canines, Midas. Their 



tail is also more slender and not annulated. 



Sim. cedipus, L. ; BufF. XV. 17. (The Pinche). Grey, waved 

 with brown; long white hairs on the head which hang behind the 

 ears; tail slender and red. From the banks of the Amazon;];. 



* Add Nyclipithecfelinus, Spix, pi. 18. 



t It is difficult to establish very specific limits between Ouistitis of different co- 

 lours. The Jacch. penicillatus, Geoff., Spix, pi. 26, has a white spot on the forehead, 

 and the tufts of the ears brown or black. — His J. leucocephaliis, Pr. Max., lib. 2, has 

 the same tufts, but the whole head and fore part of the neck are white. — His J. hu- 

 meralijer has the breast, shoulders and arms white. — The J. albicoUis, Spix, pi. 25, 

 has the spot on the forehead, tufts of the ears and a large collar all white. In some 

 of them, on the contrary, all the white has disappeared. See Annal. du Mus., XIX. 

 p. 119—122. 



t I suspect the Mid. bicolor, Spix, pi. 24, is merely a variety of the Sim. cedipus, 

 and his M. mystax of the M. labiatus. 



t^ (a) The name of Ouistitis is given to the animals of this species from the peculiar 

 sound which they emit, and which is very closely imitated if we express separately 

 and at intervals the successive syllables wliich compose the word. — Eng. Ed. 



