In an earlier paper, Eastham & McCully (1943), the results of an investigation into the effects of temperature and humidity on the oviposition responses of Calandra granaria were published. There the effects of environment on the multiplication of cultures of Calandra were recorded in so far as that increase depended upon the rate of egg-laying, number of eggs laid and the length of ovipository life of females. An attempt is made here to extend that information, not only by showing how environment determines the total duration of a developmental period, but how it affects each separate instar of that period from the egg to the emergence of the adult from the pupa.
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Eastham et al. (1947) studied this question.
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