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Dear Michel, your fly is probably a Thaumatomyia. What seems me more interesting is a rather large pale brownish structure on its scutellum, which reminds a Stigmatomyces fungus. These fungi are species/genus specific but I am not aware about such fungi on Thaumatomyia. If it is really a Stigmatomyces, it should be sent to a specialist. Curiously, this structure appears appears to be lacking in the above picture (in dorsal aspect).