Serial Morphology as a Technique for Determination of Reproductive Patterns in the Corn Earworm, Heliothis Zea (Boddie)1

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Abstract
The morphology of the reproductive system and the mechanics of spermatophore formation in Heliothis zea are described. The ductus ejaculatorius simplex of the male was found to consist of two separate functioning parts, divided by a coil area where the frenum of the spcrmatophore is formed. Spermatophore formation involves a complicated series of operations in which the male endophallus expands drawing the spermatophore from the ductus ejaculatorius simplex and depositing it in the bursa copulatrix of the female. As the fat body in unmated moths is depleted the production of mature eggs having the chorion is inhibited, possibly by the absorption of the immature eggs not having the chorion. Formation of mature eggs is not inhibited in mated moths. Percentages of mating for moths of various age groups were obtained by dissections of large samples from several light-trap sources.

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