Abstract
Development of larval ovaries in the brainless male pupae of the silkworm, Bombyx mori, was induced by the injection of 20-hydroxyecdysone or prothoracicotropic hormone. Number of eggs which developed in the brainless male pupae ranged from 55 to 57. The eggs in the brainless male pupae developed without accumulation of vitellogenin which was normally formed in the eggs produced by the females. It was shown that ecdysteroids or prothoracicotropic hormone and pupal environment are necessary for oogenesis to take place.
