Late sixties or early 70s French offbeat movie

Hi there, hope you can help me. I saw a movie on TV in the early seventies, most likely French but dubbed into English. It was in color and must have been produced pre 1976.

A bald-headed man (dressed in black, I think) armed with a crossbow embarks on a vigilante mission, killing targets on his road trip – he drives a motorcycle with a side-car in which, I think, his mother is the passenger! There is one scene where he goes to an open-air performance and, from a distance, shoots one of the actors who drops down dead . . . and the audience don’t notice this, thinking it’s part of the performance. Please help!

Thanks.

Etienne

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