Abstract
The spectral efficiency of the dark-adapted eye of Ephestia cautella has been measured using the electroretinogram technique (ERG). Two regions of high efficiency were found, one in the yellow-green, around 546 nm, and one in the ultraviolet (UV), around 350 nm. A regional specialisation of the eye was revealed, the spectral efficiency in the ultraviolet region being greater in the dorsal and ventral regions of the eye than that in the equatorial region. It is suggested that the high dorsal UV efficiency may be of importance in the navigation of E. cautella, while the high ventral UV efficiency may act in the orientation to nectar sources by the use of nectar guides.
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