Map 1. — Northern Mato Grosso, Brazil, showing the location of tribes among whom field work was done. Numbered 

 blocks refer to the following tribes or groups of tribes: 1, The Guat6; 2, the Bororo; 3, the Umotina; 4, the Nambicuara; 

 5, the Iranxe; 6, the Bacairf; 7, the Upper Xingu tribes. 



