Abstract
Adult O. fasciatus (Dall.) were exposed in boxes offering a two-choice situation between various wave lengths in the visible spectrum. Opaque and clear exposures were similarly tested. In any given color combination, more insects chose the shorter wave length. These results are interesting because in general the longer wave lengths are more deleterious in nature than the shorter wave lengths. The location of photoreceptors other than ocelli and compound eyes is speculated upon.

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