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I doubt you'll get what is needed - a clear shot of the antenna of a male: if it is Clytocerus, this will have a wavy brush of hairs on the basal segment (easy to see on a slide, less so in nature !). If you're feeling strong, give it a go, or slap it into alcohol and I'll identify it from here. The situation you describe would certainly not rule out a number of possibilities...pity they're such tiny buggers ! Still, no-one said being a dipterist was supposed to be easy...