Abstract
1. The venom of the solitary wasp Philanthus triangulum contains a cholinergic antagonist of the nicotinic receptor of the rectus abdominis muscle of the frog, Xenopus laevis. 2. The venom of African P. triangulum contains two different cholinergic factors, a competitive and a non-competitive antagonist. 3. The venom of the European P. triangulum may not contain a competitive antagonist of the nicotinic receptor of X. laevis, but only a very strong non-competitive antagonist. 4. The possible non-synonymity of both groups of P. triangulum is discussed.
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