48 MAMMALIA. 



Both of them are of different browns; in the first, the circumference of the face 

 is blackish; in the second it is whitish; but the shade of colour in all the rest 

 of their bodies varies between a brownish black and a fawn colour, sometimes 

 even a white. The shoulders and breast are, however, generally lighter, and 

 the calotte and hands darker. 



Others, again, have the hairs of the forehead so disposed as to form a kind 

 of aigrette, such as the 



Sim.fatuc/lus, Gm. (The Horned Sajou.) This animal has a tuft of black 

 hairs on each side of the forehead. 



The dispositions of those Monkeys are mild and gentle, their motions quick 

 and tight, and they are easily tamed. Their name of Weeping Monkeys is 

 derived from their soft plaintive voice. 



In the SAIMIRI the tail is depressed, and almost ceases to be prehensile; the 

 head is very much flattened ; in the interorbital partition of the skeleton there 

 is a membranous space. There is only one known ; the 



Simia sciurea, Buff. (The Saimiri.) Size of a Squirrel ; of a yellowish 

 grey ; fore-arms, legs, and the four extremities, of a yellowish fawn-colour ; 

 end of the nose black. 



Those of the American monkeys, whose tails are not at all prehensile, are 

 called SAKIS. Several of them have that appendage long and tufted, whence 

 they have been also termed Fox-tailed Monkeys: their teeth project forwards 

 more than those of the others. They are the PITHECIA of Desmarets and 

 Illiger. 



Simia pithecia, L. (The Yarke.) Blackish; circumference of the face 

 whitish. 



Spix distinguishes those species whose tails, although tufted, are shorter 

 than the body, by the name of BRACHIURUS. His Br. Ouuraki has a fawn_ 

 coloured body; head, neck, arms, and feet black. 



In some, also, the CaUithrix, Geoff., or Sagouins, Fr. Cuv., the tail is slen- 

 der, and the teeth do not project. The Saimiri were associated with them for 

 a long time, but the head of the Sagouins is higher, and their canine teeth 

 much shorter. Such is the 



Call, personata, Geoff. (The Masked Monkey.) A yellowish grey ; head 

 and hands black. The 



NOCTHORDS, Fred. Cuv. 



Only differs from the Sagouins in its great nocturnal eyes, and in the ears, 

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



Nocth. triirgata, Fred. Cuv. (The Douroucouli.) Ash-coloured above, 

 yellowish beneath ; a black vertical tine on the middle of the forehead, and one 

 on each temple. It is a nocturnal animal of South America. 



They are all from Guiana or Brazil. 



