Abstract
1. The termination of larval diapause in C. americanus is cued by simultaneous long day and food.2. One long day cycle with food elicits development in a significant proportion of the population.3. A shift in the major developmental stimulus from long day during the winter to food after prolonged chilling in the laboratory was observed and is hypothesized to be an adaptation to life in shallow ponds in temperate climatic regions.4. The action of food may occur via the ventral abdominal nervous system as described by Fuller (1960) with ultimate neuro-endocrine control of development residing in the brain.
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