(Originally) hymenopterans of the former division Fossores, which comprised most non-parasitic wasps (now disused); (in later use) burrowing hymenopterans; especially digger wasps of the families Sphecidae and Pompilidae.
Origin
Mid 19th century.
Definition of fossorial Hymenoptera in US English:
fossorial Hymenoptera
noun
Entomology
(Originally) hymenopterans of the former division Fossores, which comprised most non-parasitic wasps (now disused); (in later use) burrowing hymenopterans; especially digger wasps of the families Sphecidae and Pompilidae.