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Hi,

Center of France, dec. 2014, 4-5 mm, on Bamboo leaf near a pond.
Could it be a Cordyla species (male) ?

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Based on wing venation I would say Phronia. The antennae are too long for Cordyla, too. Did you collect the specimen?

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Thanks Paul
Yes, the fork in Cu is rather short.

I did not collect.

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I would say Exechia dorsalis, male.
In comparison with the common Exechia fusca, it has a single light triangular spot on the side of the abdomen and somewhat lighter margins of mesonotum.
See e.g. here:
http://www.spessart-fliegen.de/diptera/mycetophilidae/exechia/exechia_dorsalis/habs.html
Jan

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Thanks a lot Jan