Cleptoparasitic: Hosts Hoplitis adunca, Hoplitis ravouxi, Hoplitis anthocopoides, Megachile (Chalicodoma) parietina and Megachile argentata (Banaszak & Romasenko, 1998; Stanisavljević, 2000).
Mavromoustakis (1948) reports activity around a nesting site of Megachile roeweri in Cyprus