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Apologies fro posting this again, but I thought moving to the Syrphidae forum might help to get an answer:

A while ago there was some discussion on diptera.info about a forthcoming paper on Xanthogramma species that would describe up to two new species in the X pedisequum complex. I see that the Finnish Syrphidae site has a key that includes X stackelbergi, split from X pedisequum, but no reference is provided. Can anyone advise the published paper that describes this new species?

I appear to have a specimen of X stackelbergi, but I am not sure that the new species is accepted as valid?