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Morphological and ecological differences between two endemic species of A sian

A bstract: A . insulana (Lindberg, 1961) and A. madeirensis (China, 1938) are two endemic and closely related species of the A sianidia persp id lla ta complex present in Madeira. They are relatively easy to distinguish on the basis o f the aedeagus shape, body size and colour pattern, yet nymph morphology, distribution, plant associations and habitats were poorly known. The present study is a general overview of the morphology and ecology o f this pair of species. New information on intraand inter-specific variation, together with new distributional and ecological data are presented as a result o f a thorough field-work from sea level up to the mountains and involving all main vegetation zones in the island. Moreover, their eventual origin through adaptive radiation by host-plant shift together with some conservation considerations are discussed.