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This entry offers information on the morphological and ultrastructural characteristics of the chorion of cimex lectularius linnaeus (hemiptera:cimicidae) commonly known as bed bugs. Detailed structure of its egg is presented including scanned images through electron microscopy. Materials and method used in the examination are also included.

The article studies the morphology of the chorionic surface of two pyralids, the native Melitara prodennialis and the exotic Cactoblastis (C.) cactorum cactus moths that feed on Opuntia cactus, using scanning electron microscopy. Findings show that the chorionic surface of Cactoblastis cactorum has a reticulate pattern due to the ridges on the surface and aeropyles. The similarity of the general appearance of the chorionic surface of Melitara prodenialis to C. cactorum is highlighted.