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Hello, I'm sure this specimen is a Bibionidae (short antennae and two long basal cells on the wing (c1, c2) of the same size, black pterostigma on the wing) and a male (really big eyes bigger than the head)

It's possibly Bibio johannis : no white hairs and red legs. But, be careful, I don't know species from Greece, only from France.

Have a good day