Abstract
The sexual behaviour of Chorthippus curtipennis females consists of ‘primary defence’, passive and active copulatory readiness, ‘secondary defence’, and egg-laying behaviour. Mechanical or chemical stimulation of the spermatheca by the spermatophore does not cause the release of ‘secondary defence‘; chemical stimuli deriving from the ovaries can also be excluded. ‘Secondary defence’ is triggered by the pressure of natural or artificial eggs against the walls of the lateral oviducts.
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