The head is yellow, quite large and inflated-looking, with a kind of bubble at the front and narrow cheeks.

The short antennae are brown, their second segment has the same length or it is longer than the third.

The abdomen is long, round in cross-section, the seventh segment is oblong and conical.

Heracleum sphondylium), Onagraceae (Chamerion angustifolium), Lamiaceae (Teucrium scorodonia) and Rosaceae species (Blackberries, Rubus fruticosus sp.).

[5] Their larvae are endoparasites of bumble bees of the genus Bombus[5] (B. lapidarius, B. terrestris , B. hortorum, B. pascuorum, etc.).