Abstract
Electrical activity of the brain suboesophageal, second thoracic, and last abdominal ganglia was studied in a monovolitine race of the oak silkworm at different stages of metamorphosis and in diapause. Cholinesterase localization was demonstrated in the same ganglia. On the fourth to sixth days of the pharate pupal stage electrical activity was found only in the last abdominal ganglion; it recovered in all pupal ganglia some days before adult emergence. No changes occurred in cholinesterase localization during diapause and metamorphosis. These facts are discussed in the light of modern conceptions of the physiological mechanisms of diapause in the Lepidoptera.
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