MAMMALIA 



77 



provided with peculiar resonating structures that greatly add to the 

 volume of sound produced in the dismal concerts to which these 

 animals are addicted. Other illustrative species are the Barrigudo 

 (Lagothrix Humboldti\ with woolly fur, and the slender Spider- 



Fig. 46. The Miriki or Woolly Spider-Monkey (Eriodes arachnoides] 



Monkeys, such as the Miriki (Eriodes arachnoides] (fig. 46), which 

 are distinguished by the reduced condition of the thumb. 



The most familiar New World monkeys are probably the Sajous 

 or Capuchin Monkeys, belonging to the genus Cebus. The face is 

 bare and wrinkled, and there are generally peculiar adornments of 

 the nature of whiskers, &c. The long prehensile tail is com- 

 pletely covered with hair, and does not serve as an organ of touch. 

 An example is the Weeper Capuchin (Cebus capucinus}. 



