Abstract
THE dorsal ocelli of adult insects are present in some representatives of almost all orders except Collembola and Ephemeroptera1. Despite their wide occurrence among orders of insects, most hypotheses of their function have usually been ad hoc (for summaries of theories, see refs. 2–4). The physiological nature of the organs, their diversity throughout thousands of species, and their complex role in the integration of behaviour have not yet been thoroughly explored. Knowledge about these organs has begun to accumulate, and recent behavioural works on bees5,6 and on wasps7 give rise to the possibility that the ocelli may be associated more closely with visual perception than was previously thought. This communication is a preliminary report of the possibility that the ocelli act as visual sensitivity adjusters.
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