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This Limnophora give me a headache. :@
Unfortunately, I have only this lateral picture, but fly was collected.

Running Gregor et al. key :
2 or setae + 4 ps dc -> couplet 5
5a. Setulae on basal part of R4+5 reaching almost to half distance between radial node and anterior crossvein. -> couplet 6
5b. Setulae on basal part of R4+5 confined to radial node. -> couplet 7

I have already some doubts from here, because I find 3 setulae after radial node, but confined in the basal fifth to distance betwween radial node and r-m crossvein.

If I take couplet 6, I have choice between L. olympiae and L. setinerva.
If I take couplet 7, with only 1 post. seta on mid tibia, I have choice between L. riparia and L. exuta (ruling out out L. caesia and L. pulchripes).

Running d'Assis Fonseca key, it is worse, I can't tell whether profrons is so angular or not, it seems to be intermediate between fig. 10m and 10n !

So, your advices are welcome.

Locality : Le Havre (France)
Date May, 6 2007
Size 6-7 mm.