抄録
Filter papers kept in containers of the female cockroach, Periplaneta americana L., are extensively used as a source of sex pheromone extraction. These females began sex pheromone production about 10 days after imaginal ecdysis and the production continued more than 2 months. Although the calling pause of the female P. americana was not observed, sex pheromone could possibly be emitted through the anus. Alimentary canal extract was active on sex pheromone bioassay among various parts of the female body. The midgut was found to have higher activity han other parts of alimentary canal.Midgut epithelium was examined under the light microscope. An apparent difference was observed in midgut epithelium between males and pheromone-producing females.The CHAMPY-fixed midgut epithelium cells of the pheromone-producing females contained small, but characteristically osmiophillic, lipoid granules of unknown nature.
