Because of similarity of the psychoactivity of the snuff prepared from Virola theiodora and that from V. calophylla and V. calophylloidea, there is now every reason to presume that the latter two species owe their effects to the same or similar tryptamines as those found in the former. These compounds have also been indicated in an analysis of the bark of Virola calophylla (13). As a result of recent chemical studies, Virola must now be added to the list of South American hallucinogens the effects of which are due to tryptamines. These tryptaminic narcotics include Anadenanthera peregrina and other species of this leguminous genus; Mimosa hostilis; Banisteriopsis Rusbyana; Psychotria psychotriaefolia; and possibly Justicia pectoralis var. stenophylla. Recent field work in the vicinity of Leticia, Colombia, on the Amazon River, has uncovered an interesting new method of employing myristicaceous resin orally as a psychotomimetic agent.