Cleptoparasitic: Hosts; In Britain, a cleptoparasite of Megachile maritima (F. Smith, 1876; Gardner, 1901c; Chambers, 1949), though there appear to be no confirmed rearing records.
In continental Europe, Banaszak & Romasenko (1998), copied by Stanisavljević (2000) and Matache & Ban (2006) list M. maritima, M. lagopoda and Chalicodoma ericetorum as hosts.