Article révisé par les pairs
Résumé : The defensive secreation of several species of chrosomelid larvae and adults have been analyzed. Salicyaldehyde and some already known methylcyclopentanoid monoterpenes have been identified in the larvae. In the adults of the tribe Phaedonini, two isoxazolin-5-one derivatives (8 and 9) were isolate and their structures determined. The chemical defence of chrysomelid beetles is briefly reviewed with emphasis on chemataxonomy and ecological significance. © 1982.