Little is known of the Makus. We do know that, as 
nomadic forest-dwellers, they have a keen knowledge of 
plants: they acquire machetes from Indian groups of 
higher culture by preparing for barter a type of curare 
or arrow-poison which has the reputation of being the 
best of the entire region. Schultes, who has contacted 
several groups of Makus, states that, since they cultivate 
no plants, they chew coca and use tobacco only when 
visiting settled Indians of other tribes but that they 
apparently do use caapi from wild sources. On the 
Colombo-Brazilian boundary, Schultes (47) discovered 
amongst a group of Makus, and experimented with, a 
new kind of caapi, made from Tetrapterys methystica, a 
genus related to Banisteriopsis. It is a narcotic prepared 
from wild lianas and is apparently not cultivated. We 
have no knowledge as to whether this caapi is used only 
by the Makus or not, but it has not yet been detected 
amongst the Tukanos. 
Karihona: linguistic family Marib, according to 
Mason (24a). 
At the present time, there are two isolated groups of 
Karihonas; one at the headwaters of the Vaupés River, 
the other in and near La Pedrera on the Brazilian fron- 
tier of the Caqueta River. These two groups migrated 
to their present sites about 1914 from the distant head- 
waters of the Apaporis River, where they had an inter- 
necine war and were decimated by small-pox brought in 
by white balata-explorers. 
They use yajé and tobacco, the former as a concen- 
trated drink, the latter as a snuff. 
Tunebo: linguistic family Chibcha, according to Rivet 
(38b). 
Inhabitants of the humid jungle regions in the south- 
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