Abstract
It is possible to project a horizontal line of light onto a moth's cornea and simultaneously a vertical line onto the retina (Fig. 1). In the dark adapted eye of a sphingid moth (Theretra latreilli) this resulted in the appearance of a horizontal line of pigment across the eye (Fig. 2). This proves that the trigger for pigment migration is near the cornea, presumably in the pigment cells themselves, and not in the receptors.
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