1865.] DR. J. E. GRAY ON NEW SPECIES OF CEBUS. 827 
10. C. teucoceruatus. (Fig. 4.) 
Fur dark reddish brown, very obscurely punctulated ; head to the 
front edge of the ears white; a short central narrow black streak 
on the back of the forehead ; feet blackish. 
This may be a variety of C. versicolor, Pucheran, although he 
particularly says it has no streak on the forehead. 
Hab. Columbia. 
11. C. FLAVESCENS. 
Fur nearly uniform pale yellow fulvous ; the cheeks, whiskers, and 
hair under the throat greyish; the crown, nape, and middle part of 
the back rather darker ; outside of the leg rather redder ; hair of the 
top of the head and nape rather elongate, and directed backward. 
C. gracilis, Gray, List Mamm. B. M.; not Spix, t. 5. 
Hab. Brazil. 
IV. Hairs of the crown of the head elongate, erect, forming a single 
central more or less conical crest. 
12. C. rosustus. 
13. C. ANNELLATUS. (Fig. 3.) 
Fur brown, reddish-washed, especially on the thigh, hairs with 
several pale rings; streaks on sides of neck bent down in front of 
the shoulders, bright yellow; belly reddish; crown, temple, whis- 
kers, fore and hind legs, and tail blackish; face with dark-black 
hairs ; crown-spot broad, with a broad line to the forehead and to the 
whiskers. 
M. I. Geoffroy mentions, but does not describe, a Monkey under 
C. capucinus which may be this species. 
Hab. Brazil. 
V. Hairs of the crown radiating from a centre; directed forward 
in front, and forming, with the eyebrows, a transverse crest. 
14. C. curysopvus, F. Cuvier. 
Hab. Brazil. 
15. C. suscristatus. (Fig. 2.) 
Fur blackish brown ; outside of the hind legs yellowish-washed ; 
sides of face pale ashy ; front of shoulders of the upper arms yellow- 
ish; the superciliary crest distinctly marked. 
Hab. Brazil. 
VI. Hairs of the crown elongate, erect, diverging in all directions, 
forming a kind of cap. 
16. C. capituatus. (Fig. 1.) 
Fur rather elongate, brown, slightly washed with yellow, especially 
