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Hello, Paul and Kahis!

Thanks for your answers! I was quite surprised that the larvae could be identified to family level. I am content with that. Normally I don't collect the insects I photograph. I know that it's necessary for scientific purposes, but would it be worthwhile for such rather "trivial" flies like Lonchaeidae to collect and kill the larvae? (I have already collected some weevils and true bugs for entomologists, who were interested in the not so often found species, but normally I prefer to let the animals live.)