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The major works listed by Hollis (1980) are
Hull, F.M. ,1973. Bee flies of the world. The genera of the family Bombyliidae.Washington (Smithsonian Institution Press) 687 pp. Keys subfamilies, genera (generic placements controversial).
Evenhuis, N.L.,1991.Catalog of genus-group names of bee flies (Diptera: Bombyliidae) Bishop Museum Bulletin of Entomology 5: 1?105.
Bowden, J.,1980 Family Bombyliidae. pp. 381?430. In R.W. Crosskey (ed.), Catalogue of the Diptera of the Afrotropical Region, 1437 pp., London: British Museum (Natural History)

He gives no references specifically for the Palaearctic area:(:(.