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Thanks
Do you mean that this adult is not Hydrellia...
I can believe as I'm a beginner and I dont'know really what happens outside the water
But Ichneumonidae have 4 wings, two anterior and two posterior and here
there is only 1 pair Wings pad

But the antennae of Hydrellia are really not so long !!

I have a picture of the mouth.. perhaps this will confirm Ichneumonidae
I will post it in a moment

SDS

SDS