Function of the Corpus Allatum in ‘Dauer-pupa’ of the Silkworm, Bombyx mori

Abstract

RECENTLY it was reported1 than when the corpora allata in the Eri silkworm pupae were transplanted into artificially diapausing pupae which were obtained by removing their brains at early pupal time, the diapausing pupae were induced to emerge in 25 days after the implantation. On the contrary, when the corpora allata derived from the fourth, the fifth instar larvae or moths of the same insect were transplanted into the artificially diapausing pupae of the Eri silkworm, most operated animals entered the second pupal instar several weeks after transplantation. The same results were obtained in an experiment on the Cecropia silkworm2. When the corpora allata from the Cecropia moths were transplanted into the diapausing pupae of Hyalophora cecropia, the operated insects became the second pupae.