Abstract
Male potato tuber moth, Phthorimaea opeculella, possesses a pair of brush organs which are located at the frontal edge of the upper surface of hind wings, and which are often expanded to fan-shape during copulation attempts with female moth. The morphological and histological characteristics of the organs are similar to those reported with other Lepidoptera. The excision of the organs, however, did not affect copulation success seriously. Therefore, the process of displaying the brushes does not seem to be an essential one leading to copulation, though it is suggested that the brush organs may play a role leading to copulation smoothly.
