Abstract
The influence of the environmental parameters of photophase and temperature on the induction and termination of pupal diapause was investigated in Papilio polyxenes. Some data for other species and hybrids are added for comparison. Diapause can be induced by rearing larvae under a short daily photophase régime. Diapause termination in the apparent absence of environmental stimuli occurs after a highly variable length of time. Long daily photophase has a significant terminating effect. Exposure of pupae to a cold stimulus caused diapause termination, and the length of the development time after removal from cold is inversely related to the duration of cold exposure. The adaptive significance is discussed of these effects in natural populations.
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