208 ALLEN’S NATURALIST’S LIBRARY. 
eyes of its observer what is passing within him, and to com- 
prehend every motion and gesture. 
When pleased it utters a reiterated shrill note, and draws 
back the corners of its mouth, producing a smile by con- 
tracting the same muscles as in the human face. 
II. THE WHITE-CHEEK!‘D CAPUCHIN. CEBUS LUNATUS. 
Cebus lunatus (Sajou. cornu), male; F. Cuv., Hist. Nat. 
Mamm., pl. 70 (nec Kuhl). 
Cebus vellerosus, Is. Geoffr., Cat. Méth. Primates, p. 44(1851, pt.). 
Cebus leucogenys, Gray, P. Z. 5., 1865, p. 824, pl. xlv.; id. 
Cat. Monkeys Brit. Mus., p. 48 (1870). 
Cebus frontatus, Schl., Mus. Pays Bas, vii., p. 206 (1876). 
Characters—F ur soft, elongate, silky, with thick under-fur. 
Hair on front of head elongate and reflexed, forming across the 
brow a short crest, higher above each eye; hair on top of head 
lying flat ; that on cheeks short and adpressed ; base of nose 
large, and corrugated longitudinally ; toes long; tail longer 
than in other species ; under surface of body less haired. 
General colour silky brown, almost black on the head and 
limbs, paler on the shoulders and arms; the whiskers forming a 
white, or sometimes pale yellow, band, bordering the cheeks 
from opposite the eyes to the chin. Face and hands naked, 
violet ; skin below the hair of the same colour. 
The hair of the body is longer in winter than in spring: 
but the crests, or ‘‘ horns,” and the white whiskers appear only 
when the animal is fully adult. 
Distribution.— Brazil. 
III. THE SLENDER CAPUCHIN. CEBUS FLAVUS. 
Cebus barbatus, Geoffr., Ann. Mus., xix., p. 110 (1812) ; Schl. 
Mus. Pays Bas, vii., p. 197 (1876). 
