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Influence of age, sex pheromone concentration and mating status on the response of Earias vittelta and Earias insulana males to their female sex pheromone was studied using a Tshaped oifactometer. Males of both the species showed age related variation in their response to fern ale sex pheromone and 4-day-oId males were maximally responsive. Response of males of both the species to the female sex pheromone was concentration dependent and the level of response generally increased with an increase in pheromone concentration. In£. vittella, response of mated males was comparable with unmated males. In E. insulana, mating caused some reduction in the response of males.Resume-On a etudie 1'influence de l'age, de la concentration de pheromone sexueiie et le status de l'accouplement sur la reponse des m&ies Earias vittella et Earias insulana a la pheromone sexueiie femelle conspecifique en se servant de I'oifactometre d'une forme T. Les males do toutes les deux especes ont montrl une variation ayant rapport a l'age dans Ieur reponse a la pheromone sexueiie femelle et les males ages de 4 jours etaient les plus reponslfs. La reponse des males de toutes Ies deux especes a la pheromone sexueiie femelle dependait de la concentration et le niveau de la reponse augmentait ge'ne'ralement avec Faugmentation dans la concentration de pheromone. EnE. vittella, la reponse des males accouples etait comparable avec les males non accouples. En E. insulana, l'accouplement a resulte en un peu de reduction dans la reponse des males.

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