QUADRUMANA, 59 
ears, which are partly hidden under the hair. One species only is 
known. 
Nocth. trivirgata, Fred. Cuv., Mammif.; Nyctipith. vociferans, 
Spix, pl. 18. (The Douroucouli). Ash-coloured 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 (@).—Hapare, Idlig.—Arcrorirurcus, 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, however, 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 quadrumana. 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. pl. 24. 
(The Common Ouistiti). Tail tolerably well tufted, coloured by 
rings of brown and white; body greyish-brown; two large tufts of 
white hairs before the ears. From nearly every part of South 
America. 
M. Geoffroy calls those species which have inferior trenchant incisors 
placed nearly in a straight line, and less than the canines, Mipas. 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 Nyctipithec. felinus, Spix, pl. 18. 
+ It is difficult to establish very specific limits between Ouistitis of different co- 
lours. The Jacch. penicillatus, Geoft., Spix, pl. 26, has a white spot on the forehead, 
and the tufts of the ears brown or black.—His J. leucocephalus, Pr. Max., lib. 2, has 
the same tufts, but the whole head and fore part of the neck are white.—His J. hu- 
meralifer has the breast, shoulders and arms white.—The J. albicollis, Spix, pl. 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. 
+ I suspect the Mid. bicolor, Spix, pl. 24, is merely a variety of the Sim. cedipus, 
and his MZ. mystax of the M. labiatus. 
F (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 which compose the word.—EN«. Ep. 
