The Canadian Entomologist
To this subfamily belong the giants of the family, although many species in it are of moderate or insignificant size. Here belong the "Tarantula Killers," or Pompilids, belonging to the genus Pepsis, large, brilliantly-coloured species, often with fiery red wings, or blue or black wings marked with white or red, etc., that prey upon the genuine Tarantulas and other large species of spiders.
Ashmead, William H., "Classification of the Fossorial, Predateous and Parasitic Wasps, or the Superfamily Vespoidea No.2-4" (1900). An. Paper 77.