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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.