The first thing prepared for this chapter has been the distribution map in fig. 25 with its legend. In this map tribal names and data about the snuffing of yopo as well as epena snuffs as presented in Zerries (1964, map 10, text pp. 85- 93) have been incorporated with the ethnographic information presented in the map in 'Wassen, 1965, p. 13. The data, given by Kooper (1949, map 10, pp. 536-537) have also been used, as have some of the information from Colombia presented in the paper by Nestor Uscategui M. (1959). As far as I understand the final result must give a fairly complete picture of the distribution of psychotomimetic snuffing among the South American Indians according to published reports.