2o6 Lloyd's natural history. 



ever, are not yet numerous enough, nor exact enough, to enable 

 those who have only studied the species alive in Europe, or had 

 skins, to decide with such imperfect data as to their sex, age, 

 and habitat. Not until some naturalist has made a prolonged 

 study of these nnimals in their native country, and watched 

 their conduct and relations in the living state, can we hope to 

 attain to any certain knowledge of how many species the genus 

 contains ; and of the differences between the old and young of 

 both sexes at different periods from youth to age. 



I. THE WHITE-THROATED CAPUCHIN. CE13US HYPOLEUCUS. 



Sa'i d gorge blanche^ Buffon, Hist. Nat. Mamm., p. 64, pi. 15, 



fig. 9 (1767); Fr.Cuv., Hist. Nat. Mamm.,livr.xvi.; Audeb., 



Hist. Nat. Singes, fam. v., sect. 2, pi. 5 (1797). 

 Simia hypo!eiica, Humb., Obs. Zool., i., p. 337 (1811) ; Pucher., 



Rev. et Mag. de Zool. (2), 1857, p. 348. 

 Cehus hypoleiictis^ Geoffr., Ann. Mus., xix., p. iii (18 12) ; Gray, 



Cat. Monkeys Brit. Mus., p. 50 (1870); Schl., Mus. Pays 



Bas, vii., p. 190 (1876). 

 Cebus leiicocephalus, Gray, P. Z. S., 1865, p. 827, fig. 4; Sclater, 



P. Z. S., 1872, p. 4 ; Alston in Godman and Salvin, Biol. 



Centr. Am. Mamm., p. 13 (1879). 

 Characters. — Hair very silky, smooth and stiff, and thicker 

 above than below. Face and forehead nude, flesh-coloured; 

 hands and feet nude, of a violet hue, as also the thinly- 

 haired skin of the under side of the body. The tip of the tail 

 \J for a short distance being naked, distinguishes this species from 

 all others. Shoulders, arms, and sides of the head behind the 

 ears pure white ; chest and throat yellowish ; rest of the body 

 deep black. 



