Heracleum sphondylium
Adults behave like solitary wasps. They fly from June to September and feed on nectar and pollen of flowers, mainly of "Chamerion angustifolium" ("Onagraceae"), "Heracleum sphondylium" ("Apiaceae"), "Leucanthemum vulgare", "Cirsium arvense", "Senecio nemorensis" ("Asteraceae"), "Valeriana", "and "Lamiaceae" species.