Abstract
The flight behaviour of males of the Rutherglen bug Nysius vinitor differs from that of immature females. As opposed to females, there is no indication that the flight of males is migratory. Displacement movements of females are a synchronized phenomenon whereas those of males are not. Males are less adapted than females to changes in their habitat and are unable, even when starved, to fly persistently. Flight behaviour of females is independent of mating, but most of them take off on their migratory flight soon after having been fertilized. It seems that migration of males is of little importance for future population increase.
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