THE KULU-KAMBA 87 



is only known south of the equator and between the 

 second and fifth parallels north of the Congo and west of 

 Stanley Pool. Both kinds are found within this district, 

 but the variety which is confined to that region is called, 

 by the tribes that know the ape, the kulu-kamba, in con- 

 tradistinction from the other kind known as ntyigo. This 

 name is derived from kulu, the onomatope of the sound 

 made by the animal and the native verb, kamba, to speak ; 

 hence the name literally means " the thing that speaks 

 kulu." 



In certain respects the common variety differs from 

 the kulu-kamba in a degree that would indicate that they 

 belong to distinct species ; but the skulls and the skeletons 

 are so nearly alike that no one can identify them from the 

 skeletons alone. In life, however, it is not difficult to dis- 

 tinguish them. The ntyigo has a longer face and more 

 prominent nose than the kulu. His complexion is of all 

 shades of brown, from a light tan to a dark, dingy, mummy 

 color. He has a thin coat of short, black hair, which is 

 often erroneously described as brown ; but that effect is 

 due to the blending of the color of his skin with that of 

 his suit. In early life his hair is quite black, but in 

 advanced age the ends are tipped with a dull white, giv- 

 ing them a dingy gray color. The change is due to the 

 same causes that produce gray hairs on the human body. 

 But there is one point in which they greatly differ. The 

 entire hair of the human becomes white with age, while 

 only the outer end of it does so in the chimpanzee. In 

 the human one hair becomes white, while others retain 

 their natural color ; but in this ape all the hairs appear to 



