Cleptoparasitic: Hosts: On Jersey, almost certainly a cleptoparasite of Megachile leachella (E. Saunders, 1902), as in the Netherlands (van der Zanden, 1982) and Germany (F.K. Stöckhert, 1933). Banaszak & Romasenko (1989), copied by Stanisavljević (2000), additionally cite M. apicalis as a host.