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Thank you both,

I hesitated between oblonga and crassipennis because this male didn't look like the males of crassipennis that I usually see (the abdomen seemed longer and the sternite 3 narrower)

I don't know if Ectophasia oblonga has yet been seen in Belgium, but it is not reported from Belgium on the site of observation.be and of the Royal Institute of Natural Sciences of Belgium

Christine