[A new effect of carbon dioxide: transformation of subsocial species of insects by chronic treatment].

The carbon dioxide is used to chronic treatment of one minute per day during all the larval life time. This treatment must be distinguished from all those previously described. Subsocial species are changed into their solitary form, although they live in group. The comparison of the pigmentation with slightly or non subsocial species seems to indicate that this effect is linked with the subsocial state. The results are discussed on the basis of nervous and endocrine functionning.