I brought the fly in question thread up and have had a rely from someone else. This is the difference between the two, one point I did noticed when looking again was the yellow at the edge of tergite 5.
Quote:
In E. lapponicus, the side margin of tergite 5 is at least partly black, while in this specimen it is entirely yellow. E. luniger is much more likely, based on the yellow side margins of tergite 5, the yellow hairs on the scutellum and the yellow abdominal spots not reaching the side margins of the tergites. Besides, the genitalia are not conspicuously large, so that rules out E. corollae.
The best character for E. lapponicus is the sinuate vein R4+5, but this is not visibe in this picture either.
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Now we are all a little wiser
. My eye for detail has developed more since last year too!