[Experiments on the conditions of organogenesis in the female reproducture glands and ducts ofTenebrio molitor L.]

The female presumptive genital epithelium ofTenebrio molitor shows two stages of determination. 1) An essential determination which appears in the larva, but which must occur during the embryonic period. 2) A mosaic determination which is reached within twenty four hours before metamorphosis. The presumptive genital epithelium is able to complete its organogenesis normally after becoming competent and being submitted to the hormonal conditions of metamorphosis. The acquisition of competence appears to be linked to a process of growth.