Abstract
Carausius morosus is one of the few insects exhibiting physiological colour change in the epidermal cells. The distribution of ommochromes, carotinoids, and pterindines is analysed in light and dark adapted animals. In light adapted animals the ommochrome granules are concentrated at the proximal cell membrane. During dark adaption they move to the distal cell membrane, dispersing there over the whole cell forming a shield of dark pigment. The carotinoid granules behave in a similar way. The rod shaped pteridine granules are concentrated in the distal half of the epidermis. They show no daytime dependent movements. However, they take part in the physiological colour change indirectly. Apparently, biliverdin is not attached to granules but dissolved in the epidermal cells.
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