Abstract
Offspring of old parents completed their larval stage in 10 days (6% to 6.5%) less time and averaged 1.2 fewer larval molts than offspring of young parents; also, they began a rapid weight increase at an earlier age. This was true of individuals reared at 25° and of those which had normal development at 30°, a temperature above the optimum for the species. Offspring of old parents also had an adult life shorter than did offspring of young parents, the difference averaging 8.8 days (19%) at 25° and 9 days (26.5%) at 30°. Offspring of middle-aged parents had a larval life of intermediate length at 25°, and also at 30° if their development was normal. At 30°, however, many larvae had a very prolonged instar which greatly increased the total length of larval life. Parental age was not found to affect the duration of the pupal stage.
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