10 



motion, they have no cheek pouches, nor the calloused por- 

 tions present in the old world forms. 



The famous Spider Monkeys are first in rank. There are 

 twelve species embraced under the title A teles. 



GROUP 4.— The Coaiti {A teles paniscus Geoff.) is the 

 most familiar species ; and exhibits the more remarkable 

 characteristics peculiar to this group of monkeys. It is 

 often seen in the zoological collections in Central Park. 

 One is impressed at once, on seeing this monkey moving 

 within his cage, with its striking resemblance to a great 

 slender spider ; especially from certain deliberate move- 

 ments of the limbs ; five equally important and equally used 

 members are in motion at once, the tail being of the first im- 

 portance; constantly he presents this member, a fifth hand, 

 from over his head ready to clasp the first support attainable 

 before him, it is the avant courier of all his movements. 

 Other species are larger and have the same strong prehen- 

 sile tail; notably the Bartlett Spider Monkey. 



The next genus includes two species, the most common 

 of which is HUMBOLDT'S MONKEY (Lagothrix lium/wldti 

 Geoff.), famous for its beautiful fur, that is an important 

 article of commerce in Brazil. Sixteen species of the genus 

 Cebus follow next in rank. 



The Monk Monkey {Cebus xanthocephalus Spix) is 

 one of the most familiar forms. Several species of these 

 monkeys are frequently trained for street exhibitions. 



Ten species of the genus Mycetes are known, they arc the 

 notable and notorious Howlers ; terrible disturbers of the 

 quiet of their native woods. They have a peculiar develop- 

 ment in the throat by which their loud harsh voice is much 

 increased in volume. 



The Golden Howler (Mycetes seniculus Kuhl.) is a 

 familiar form ; it has a large body, yet its prehensile tail 

 is sufficient to hold it suspended even by the use of only 

 the extreme tip. 



GROUP 5. — Several weak-looking, long-haired monkeys 



