Abstract: The sex pheromone-producing gland of cotton bollworm Helicoverpaarmigera Hiibner is a modified intersegmental membrane as a complete ring of glandular epithelium between the eighth and ninth abdominal segments. The gland cell of 2-day old female moth is cuboidal and larger than the epidermal cell in unmodified intersegmental membrane. It is highly convoluted with a dense scattering microspines without pores on the surface. The cuticle has two layers:epicuticle and endocuticle. The epicuticle is dense and relatively uniform in thickness. The endocuticle varies in thickness and consists of 12-14 lamellae of helicoidally arrangedmicrofibrils on which there are pore canals formed by epicuticular filament. The apical surface of plasma membrane has well-organized microvilli. The basal plasma membrane is also folded. The cytoplasm contains rough endoplasmic reticulum, Golgi complexes, lipid droplets, glycogen deposits, and mitochondria. The largeetlipsoidal nucleus is usually in subcentral position.

Key words: Helicoverpa armigera, sex pheromone gland, histology, ultrastructure