The distribution of this wasp has changed dramatically, there are no modern (post 1990) records from its former localities along the south coast, and many of these are from the first quarter of the 20th Century. The record from West Sussex is known to have been a mistake, leaving O.W. Richard’s 1925 Oxshott, Surrey record as the only inland site, pre 1990. Older records from the Channel Islands have been repeated post 1990, so the situation here is unchanged. The big change is the cluster of well-supported records towards the north of East Anglia, predominately Norfolk. The presumed host, Argogorytes fargei, has been recorded in this area on a number of occasions since 1939, but with a concentration of records post 1990. Whether this situation reflects a real change in the distribution, or just a change in the distribution and activity of recorders, several BWARS Members are very active in this formerly poorly covered area, is not clear.
Abroad, recorded from most European countries and Asia Minor (Lomholdt, 1975-76).