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This is a mystery fly for me. The wing venation puts it somewhere between Rhagionidae and Syrphidae. Maybe a largish Pipunculid species?

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Lateral view of the same individual.

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Yes, it's Nephrocerus in Pipunculidae.
Our largest Pipunculid.

Theo Zeegers

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Thx Theo,

There are only three species in Hungary, I'll ask Foldvari, who works nowadays on Pipunculidae in Budapest to try to tell me the species unless someone comes forward here with species level identification.

I guess N. sp. are quite rare anywhere and I think this is a good find for my locality.

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a female of either N. lapponicus Zett. or N. scutellatus Macq. but difficult ti decide which from these photos, need good profile of hind tibia, looks most likley to be lapponicus.

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I try to come back to this photo sometimes later, I think I have the specimen.

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Gabor, we have published a paper on the parasitic relationships between Nephrocerus and Tipula. Nephrocerus used most female Tipula species as host for their young. Here is the link for their relationship. Scroll down to the end to read. As you know that all the other pipunculid are parasite of homoptera like leafhoppers etc.

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Intersting. This fly is relatively large for the Tipulids that emerged in the spring. Must be extremely efficient in using up the resources of the host.