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Hi John,

thanks for the correction. You are certainly right, I just found pictures of freshly hatched Anthrax anthrax which look a lot like that one.
A. anthrax is obviously parasitizing mason bees, like Osmia sp.. These use the insect shelter frequently and numerously, so it might well be a recently hatched specimen. It was sitting at the side of the shelter for a long time, before it finally took off.

Greetings, Uli