Identification key and general biology are given in Morgan (1984). Previously this species was misidentified as H. amoenula and is also known as H. generosa (Förster, 1853) in Kunz (1994).
Only recorded from Sark and Jersey from the Channel Islands.
Overseas, the wasp occurs throughout much of Europe (including Norway, Sweden, Finland, Denmark, The Netherlands, Belgium, Luxembourg, France, Spain, Germany, Italy, Poland, Hungary, the former Yugoslavia and Greece); also from Turkey, Syria, Palestine and Iran.
The Channel Islands were not included in assessments of conservation status either in Shirt (1987) or by Falk (1991).
Associated with open sandy habitats with some bare soil.
From the very few records available it has been recorded from April until June.
Fennel, wild mignonette and wild parsnip.