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I have just read the Limnophora keys for females, and with 3 postsut dc, 2 post setae on mid tibia, the distinct pattern on scutum and the 2 black spots on each corner of scutellum, I haven't almost any doubt that it is this L. maculosa.
Can you tell, Gabor, whether it was near water as Nikita asked (to be more confident on the genus).