[Origin of glial cells in the retina-lamina-complex ofEphestia kuehniella zeller (Lepidoptera, Pyralidae)].

Following from the observation that the glial cells of the wild typeEphestia synthesize pigments, but those of the mutant "wa" do not, transplantation experiments were carried out to sattle the question of the origin of the glial cells. Eye-anlagen of the mutant "wa" were transplanted toa +-pupae and vice versa. These experiments showed that only some of the glial cells of thea +-eye originate from the eye-anlage, while the others come from the lobus opticus. The glial cells of the eye-anlage remain in the nerve-bundle-region, whereas those from the lobus opticus form the pigmented perilemma, enter the nerve-bundle-region and spread over it up to the basal membrane of the eye.