Abstract
Adults of the brachypterous blattid Pelmatosilpha coriacea Rehn eject hex-2-enal-1 when they are disturbed. This compound is stored in a large sac situated between the sixth and seventh sternites. Under field conditions, the secretion of Pelmatosilpha was observed to be an effective repellent of ants. On the other hand, this cockroach was eaten readily by lizards of the genus Anolis. The implications of these results are discussed.
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