Gypsy moth kairomones influencing host recognition responses of two species of hymenopteran parasitoids, the chalcicidBrachymeria intermedia(Nees) and the braconidApanteles melanoscelus(Ratz.) were recovered from the gypsy moth,Porthetria disparL. A kairomone forB. intermediawas removed by washing gypsy moth pupae with hexane. The pupal wash, when exposed on filter paper toB. intermediafemales, elicited an antennal response characteristic of adults when they find host pupae. A kairomone forA. melanosceluswas obtained by washing gypsy moth larvae with hexane. ForA. melanoscelus, antennal responses were recorded with hexane washes of gypsy moth larvae, but not of pupae, and forB. intermedia, responses occurred with hexane washes of pupae, but not of larvae. Work on identification of the kairomones is in progress.