Cleptoparasitic: Hosts; Almost certainly a cleptoparasite of more than one host species, but there seem to be very few rearing records. L.H. Woollatt reared a specimen from a nest of Megachile willughbiella in a Betula log from Devon (G.M. Spooner, pers. comm.). A male was reared from a probable nest of this same host (Spooner in Stidston, 1951). Spooner has also observed it flying with Megachile circumcincta and M. willughbiella in Dorset, and has also noted specimens in the vicinity of the nesting burrows of Anthophora bimaculata in several localities in the same county. Several females were seen around the occupied nest burrows of Megachile maritima at coastal site in Wexford in July 1999 (S.P.M. Roberts, pers. comm.).
The following species have been recorded as hosts, or possible hosts, in the British and European literature: Megachile centuncularis (Jørgensen, 1921; Bischoff, 1927; F.K. Stöckhert, 1933; Richards, 1979; van der Zanden, 1982; Banaszak & Romasenko, 1998; Peeters, Raemakers & Smit, 1999); M. circumcincta (E. Saunders 1896a; Jørgensen, 1921; R.C.L. Perkins,1924; Bischoff, 1927; Banaszak & Romasenko, 1998; Peeters, Raemakers & Smit, 1999); M. dorsalis [as M. argentata) (Banaszak & Romasenko, 1998; Peeters, Raemakers & Smit, 1999); M. ligniseca (Banaszak & Romasenko, 1998; Peeters, Raemakers & Smit, 1999); M. maritima (R.C L. Perkins, 1923; Hallett, 1928) and M. willughbiella (Gardner, 1901c; Jørgensen, 1921; R.C.L. Perkins, 1923; Bischoff, 1927; Spooner, 1931; Erlandsson, 1955; van der Zanden, 1982; Banaszak & Romasenko, 1998; Peeters, Raemakers & Smit, 1999).