ao8 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 KD CAPUCHIN. CEBUS LUNATUS. 



Cebus lunatus (Sajou cornu), male ; F. Cuv., Hist. Nat. 



Mamm., pi. 70 (nee Kuhl). 



Cebus vellerosus, Is. Geoffr., Cat. Meth. Primates, p. 44(1851^:.). 

 Cebus latcogenys, Gray, P. Z. S., 1865, p. 824, pi. xlv. ; id. 



Cat. Monkeys Brit. Mus., p. 48 (1870). 

 Cebus frontatus, Schl., Mus. Pays Bas, vii., p. 206 (1876). 



Characters. Fur 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. B razil. 



III. THE SLENDER CAPUCHIN. CEBUS FLAVUS. 



Cebus barbatus, Geoffr., Ann. Mus., xix., p. no (1812) ; Schl.. 

 Mus. Pays Bas, vii., p. 197 (1876). 



