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Hello NakaRB,

Oh, I so love these red and black Chalsosyrphus! C. femoratus has a spine at the apex of the hind tibia like so http://waarneming...369429.jpg The haltere knob is light brown and the arista is unicolourous orange making this Chalcosyphus valgus. Very nice photo's, especially the top one!

Greetings,

Ectemnius