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The main differences are in the wing venation and structure of the thorax. For an example of chironomid venation see http://www.dipter...to_id=1466 and for ceratopogonid venation see
http://www.dipter...d_id=17996. Note that both families have variation in the venation. Personally I think your specimen shows chironomid venation. The thoracic difference is that in chironomids the dorsum usually has a median groove along it. I think I can see this in your specimen. It certainly doesn't look like any ceratopogonid I've seen.