Abstract: Two types of pheromone receptor cells have been identifiedby electrophysiological recording from single antennal sensilla trichodea of the male eri-silkworm moth Philosamia cynthia ricini. These cells responded best to the pheromone components E-4, E-6, Z-11-16- Al (AL-Receptor cell), which fire large spikes and E-4, E-6, Z-11-16- Ac (AC-cell), which fire small spikes. It was demonstrated that there were two types of olfactory receptor cell in one sensillum trichodeum by the selective adaptation.

Key words: Philosamia cynthia ricini, sensillum trichodeum, single cell's recording, sex pheromone, selective adaptation