826 DR. J. E. GRAY ON NEW SPECIES OF CEBUS. [Dec. 12, 
3. C. eLecans, I, Geoff.=C. pallidus, Gray. 
Hab. Bolivia. 
4. C. crrriFer, I. Geoff. 
5. C. veLtuerosus, I. Geoff. 
Perhaps a thicker-furred variety of the former. 
The younger specimens, and sometimes the older ones, are desti- 
tute of crests in all these five species, and therefore may be confounded 
with those of the next section. 
Fig. 4. 
III. Hairs of the crown short, reflexed, adpressed, not 
Sorming any crest. 
. C. carucinus, I. Geoff. 
6 
7. C. XANTHOCEPHALUS, Spix,=C. monachus, Fischer. 
8. C. atsirrons, I. Geoff. 
9 
. C. nyro.eucus, I. Geoff. 
