Abstract
We describe the fine structure of the vitelline membrane, the chorion and the serosal cuticle of the egg of Korscheltellus lupulinus L. (Lepidoptera: Hepialidae). We studied the details of secretion and morphogenesis of the vitelline membrane. The follicle cells produce the vitelline membrane material, while the oocyte controls the morphogenesis of the envelope. Structural changes were observed in the vitelline membrane. For example, thickening before oviposition and melanization and sclerotization after oviposition. A crystalline material was found to be a constituent of the chorion of this egg. The serosal cuticle resembles an endocuticular material of insect integument.
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