THE SQUIRREL-MONKEYS. I57 



with the angle of the mouth; but Mr. Buckley says the 

 Indians consider the black lines to be merely a sign of age. 



Distribution.— This species has an extensive range, being 

 found on both banks of the Amazon, Rio Negro, and on the 

 Copataza river ; also in Guiana, Surinam, and Colombia, near 

 Bogota- 

 Habits.— Like its congeners, the Common Squirrel-Monkey is 

 arboreal, going about in large flocks. Their food consists of 

 insects and fruits. Mr. Bates observes that the "pretty little 

 Chrysothrix sciureus contents itself with devouring what fruit 

 it can on the spot," thus differing from certain species of Cebus^ 

 which destroy more than they eat, and when about to return 

 to the forest, carry away all they can in their hands or under 

 their arms. 



Mr. Darwin has remarked in his " Expression of the 

 Emotions in Man and Animals," that *' with Monkeys the 

 expression of any painful emotion is not easily distinguished 

 from that of anger." " Humboldt," he adds, "also asserts that 

 the eyes of the Callithrix sciureus 'instantly fill with tears 

 when it is seized with fear'; but when this pretty Httle Monkey 

 in the Zoological Gardens was teased, so as to cry out loudly, 

 this did not occur. I do not, however, wish to throw the least 

 doubt on the accuracy of Humboldt's statement." 



This species is a great favourite wherever it has been kept 

 in captivity. It is very bright coloured, has a baby-like face, 

 large and bright eyes, and most gentle manners. These Mon- 

 keys are very sensitive to cold, and when a sudden fall in the 

 temperature takes place, they huddle close together, clasping 

 each other with their arms, and embracing their neighbours 

 and themselves with their long tails. 



