Saussure and Sichel, 1864 (Cat. Gen. Scotia, p. 161), in founding the genus Dielis included among others, two entirely distinct species, namely: the Australian Tiphia radula Fabr., 1775, and (as a synonym of Scotia plumipes Drury) Scolia radula Fabr., 1775, of North America.
Betrem, J. G., "The Taxon Dielis (Hymenoptera: Scoliidae) and its Type" (1962). Ba. Paper 135.
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