This species was previously placed in the genus Omalus. Identification keys and general biology are given in Spooner (1954), Danks (1971), Morgan (1984) and Kunz (1994).
Widespread from Cornwall to Kent and north to Westmorland and North Yorkshire. There are isolated records from Scotland (Fifeshire and Moray (the river Spey, near Fochabers; Shaw, 1998)). Also from the east coast of Ireland, and the Channel Islands.
Overseas, the wasp occurs in Europe (including Norway, Sweden, Finland, Denmark, Belgium, France, Spain, Germany, Italy, Poland, Hungary, former Yugoslavia and Greece), north Africa, and Asia (including Russia (Daghestan), Manchuria, Korea and Japan). There have been some introductions into the USA.