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Hello Libor and Theo,

thanks to you both! So it is not that easy as I thought...

I am no expert, but I experience here Rhagio for many years. I know, size is not an argument and time of year may not be one, too. But I see the much bigger R. scolopaceus males always here in May or beginning of June at other places, mostly fence stakes at meadows near hedges.

These smaller Rhagio I see only in mid summer at shadowy places in the forest or at tree trunks in our garden. And they are all much smaller than those flies in spring. So most likely not the result of low diet of a few larvae. Generally, for my layman's eyes they are not the same animals...
Sorry that I do not collect animals, I am a photographer only.