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henk, can you read Dutch (Flemmish:))? There is quite a good book "De Roofvliegen van Nederland" with keys etc, maybe still available at Vermandel entomolgie speciaalzaak see link http://www.vermandel.com/index.php?cat=1&sub=&item=7.265 (is this allowed?) A good clue for rufipennis is in Dutch the "antenneknobbel" (maybe some one can give me the English term for it) it should be higher than the second antenna segment is long.

By the way i'm pretty obsessed by these creatures...B)