The Canadian Entomologist
By most systematists this family is still classified with the Scoliidae, although separated as a distinct family by the Swedish entomologist, C. G. Thomson, as early as 1874. I agree with Thomson, and believe these wasps form a distinct family, easily recognize d by the characters made use of in my table of families.
Ashmead, William H., "Classification of the Fossorial, Predateous and Parasitic Wasps, or the Superfamily Vespoidea No.12" (1903). An. Paper 80.