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Sorry to spoil the party, but I disagree.
There is now way to be sure, but given the picture and the size it is most likely Bibio clavipes (or lepidus).
Arguments: size (too large for Dilophus), longer hairs on thorax and the costa seems to be light near the wing tip (not so in Dilophus).

Where the hack did I find those features:

See link section (my field key to Bibionidae on homepage Louis Boumans, thanks Louis).

Did you collect some specimen ?
Bibio clavipes would be a nice find !


Theo Zeegers