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 pupæ were transplanted into artificially diapausing pupæ which were obtained by removing their brains at early pupal time, the diapausing pupæ were induced to emerge in 25 days after the implantation. On the contrary, when the corpora allata derived from the fourth, the fifth instar larvæ or moths of the same insect were transplanted into the artificially diapausing pupæ 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 pupæ of Hyalophora cecropia, the operated insects became the second pupæ.