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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?

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Maybe it's in the latest version of Syrph the Net, but I'll have to check that myself when I am back home...

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Hi Andre,
Did you find anything regarding X stackelbergi?

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Extract from Syrph the Net database 2008:
Determination: the description of this species is based on a solitary male from the St Petersburg region of European Russia. The female remains undescribed. X.stackelbergi is included in the keys provided by Violovitsh (1975), who also figures the male terminalia. From the information provided by Violovitsh (1975) there would be no reliable way of separating this species from the taxon referred to in the present text as X.dives.

Source:
Speight, M.C.D. (2008) Species accounts of European Syrphidae (Diptera) 2008. In: Speight, M.C.D., Castella, E., Sarthou, J.-P. and Monteil, C. (eds.) Syrph the Net, the database of European Syrphidae, vol. 55, 262 pp., Syrph the Net publications, Dublin.

Violovitsh, N.A. (1975) Brief survey of palaearctic species of the genus Xanthogramma Schiner (Diptera, Syrphidae) (In Russian). Taksonomiya i ekologiya zhivotnykh Sibiri. Novye i maloizvestnye vidy fauny Sibiri, Novosibirsk, 9: 90-106.