The Metabolism in the Corn Earwonn1

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Abstract
Temp. and food during the larval period and soil moisture during the prepupal period influence the size of pupae. Water content of pupae, 58% to 72%, varied directly as water in the food of laryae and variation in wt. loss during the pupal stage was found to be largely due to humidity or soil moisture, loss of dry matter during pupal stage being relatively constant under different humidity and temp. Diapause occurring in pupal (overwintering) stage could be brought about by low feeding temp. (18.9[degree] C) during the larval period or by cold shock in the prepupal period; temp. during the pupal period had no effect on occurrence of diapause. Undercooling and freezing point and "bound water" detns. indicate that even non-diapausing pupae can stand sub-zero temps. for at least short periods. Preliminary attempts to cold harden pupae indicate that only diapausing pupae harden and that alternating low and warm temps. is necessary. Pupae not undergoing diapause resume development in subsequent periods of warmth.

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