THE SQUIRREL-MONKEYS. 155 



grizzled grey, washed with golden, the tips of the hairs black ; 

 tail short, thick and grey, but with the tip black. 



Distribution. The forests of Bolivia and Brazil. This is a 

 common species, inhabiting the whole of the Peruvian Amazons, 

 and may be met with on every stream. (E. Bartlett.} 



Habits. Arboreal and gregarious, moving about in large num- 

 bers through the forest, feeding on insects chiefly orthoptera 

 and spiders small birds, and fruits. 



II. THE BLACK-HEADED SQUIRREL-MONKEY. CHRYSOTHRIX 

 ENTOMOPHAGA. 



Callithrix entomophagus, d'Orb., Voy. Amer. Mer., iv., Mamm. 



pi. 4 (1836). 

 Callithrix boliviensis, d'Orb., Nouv. Ann. Mus., iii., p. 89 



(1834)- 

 Saimiris entomophagus, d'Orb., Voy. Amer. Mer., iv., Mamm., 



text, p. 10 (1847) ; Is. Geoffr., Cat. Meth. Primates, p. 



38(1851). 

 Saimiri entomophagus, Schl., Mus. Pays Bas, vii., p. 246 



(1876). 

 Chrysothrix stiurea (nee L.), Frantz. in Wiegm. Arch. f. Nat., 



xxxix., p. 260 (1869). 

 Chrysothrix entomophagus, Wagn., Ann. Nat. Hist., xii., p. 42 



(1843); Gray, Cat. Monkeys Brit. Mus., p. 53 (1870). 



Characters. Face grey, washed with yellow; ears haired; 

 head black ; hairs -of back black, with long yellow tips, or 

 yellow with black tips, producing a shade of brown washed 

 with golden ; outer side of upper part of arms and legs yellow, 

 peppered with black ; throat, under surface of body and inside 

 of limbs yellowish-grey ; tail long, black. 



