Scanning electronmicroscopy of antennal sensilla of the yellow peach moth, Conogethes punctiferalis (Guenee) and Conogethes sp. (Lepidoptera: Pyralidae)

Antennal sensilla of Conogethes punctiferalis (GUENÉE) and its related species Conogethes sp. were studied using scanning electron microscope. A device for fixing the sample was newly developed to make the backside observation of sample possible. Eight types of sensilla were found on the antennae of each species; Bähm's bristle, sensillum styloconicum, s. trichodeum, s. chaeticum, s. squamiformium, s. basiconicum, s. auricillicum, s. coeloconicum. Morphology, number and distribution of the sensilla observed were not different between these two species. More s. trichodea were found on the male antennae (ca. 8, 000-8, 500) than the female (ca. 6, 500-6, 800), while the reverse was the case with s. basiconicum (ca. 760 in males; ca. 1, 400 in female), suggesting that the former should be the sex pheromone receptor and the latter the plant-odor receptor for oviposition. In other 6 types of the sensilla, significant difference in the number was not observed between both sexes.