714 PRIMATES 
small canines and the bushy tail readily mark their distinction from 
Chrysothvix. Remains of Callithria have been found in the Brazilian 
caves. 
Chrysothrix.'—Head greatly elongated ; orbits large and closely 
approximated; canines well developed; tail with comparatively 
short hair. 
The small Squirrel Monkeys, of which four species have been 
Fic. 340.—The Lemurine Douroucouli (Nyctipithecus lemurinus). From Archives du Muséum, 
vol. iv. pl. 2. 
described, are characterised by the great backward projection of the 
occipital region of the skull, and by orbits approximating in size to 
those of the next genus. 
Nyctipithecus.’—Head rounded ; orbits very large, separated by 
a narrow septum ; nares somewhat approximated. 
The Douroucoulis (Fig. 340), as the members of this genus are 
called, are of nocturnal habits, in association with which the eyes 
are of enormous dimensions, as in the Lemuroid genus Loris, The 
following account of two species of this genus is taken from Mr. 
? Kaup, Thierreich, vol. i. p. 51 (1835). 
° Spix, Sim. ct Vesp. Brasi, p. 25 (1823). 
