On the copulation mechanism of Eligma narcissus (Cramer) (Lepidoptera: Noctuidae)

Abstract

The structure and musculature of male external genitalia and terminal external structure of female abdomen of Eligma narcissus (Cramer) are figured and described. The mode of firm connection between male and female external genitalia is effected in the following sequences: 1) the acute tips of valvae. which are characteristically curved outwards, are applied to the membranous ridges of female, which are present laterad to the ostium bursae, 2) the valvae are strongly expanded laterally by the contraction of M6 and male and female genitalia are firmly fixed, then 3) the phallus is inserted into the ostium.