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I'm amateur in insects. Please help me to know what is it.
I have an idea. Is it Thereva nobilitata.

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While we are waiting for the Therevid professionals to drop by, I'd hazard a guess. It could well be Thereva fulva. Thereva nobilitata is usually darker and has slightly infuscated wings. Both species have pale halteres (an unusual character in Thereva). The habitat may also help: fulva strongly prefers sandy habitats, nobilitata accept many other open habitats.

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Thanks,
It could be T. fulva.
I came across it in the garden not far from (0,5 km) a sandy bank of the river.

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Dzien dobry, Cortinarius

But then again, it might be Thereva handlirschi.
Consult the keys and look for:
Number of dorsocentral bristles on thorax (either 1 or 2)
presence or absence of dark margins on the tergites.

If they are absent, it must be fulva.
Handlirschi, on the other hand, is a forest species, also found in parks.
It is a late species: end July - September.
So if the picture is recent, you can forget about all this.

You might consult Trojan's key in Fauna Polski

Ladna fotografia !


Theo Zeegers

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Goedemiddag, Theo
So, that is decisively T. fulva. The forest is quite far from a place, where I took the picture. I found that species 12 June.
Thank you!