The contents of the Brindley's gland of Triatoma lecticularia(Stal) (Hetero
ptera Reduviidae: Triatominae) have been identified by gas chromatography-m
ass spectrometry as isobutyric acid. This compound is found in similar secr
etions from certain other members of the Triatominae, and is suggested to p
lay a role as a defensive pheromone and for intraspecies communication.