Abstract
1. 1. Low concentrations (0.05−0.38 BU/ml) of a crude venom extract from P. triangulum F. potentiate nerve-evoked contractions of the locust hindgut, possibly due to contamination of the venom preparation with proctolin. 2. 2. Higher venom concentrations inhibit nerve-evoked contractions to a dose-independent plateau level. 3. 3. The venom has no effect on responses to bath-applied proctolin, but responses to bath-applied L-glutamate are inhibited. 4. 4. Spontaneous contractions are unaffected by the venom. 5. 5. It is concluded that the plateau contractions are the result of excitation by non-glutamatergic transmission, and are possibly the result of proctolin release.
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