Neuroendocrine organs of the lemon-butterfly, Papilio demoleus L. III. Metamorphic changes in the retocerebral endocrine organs.

The retrocerebral endocrine organs, the corpora cardiaca and corpora allata were studied in different developmental stages of the lemon-butterfly. The organs were found to undergo several changes in respect of their position, size, structure and the number of nerves associated with them.