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Hi Nikita,

In van der Goot / van Veen it says that in L. fulviventris the third segment of the antenna is much longer then the arista. My fly doesn't seem to have that.
I meanwhile think it is L. aristata which, according to this key, rarely can have a bit of brown (in this case a lot of red) at the side of the (normally black) abdomen.

Thanks anyway,

Ben