Cleptoparasitic: Host: This species is almost certainly a cleptoparasite of Osmia emarginata and Osmia mustelina (Banaszak & Romasenko,1998).
Celary (1989) lists only Osmia emarginata as a host and Kasparek (2015) lists only Osmia mustelina (the senior synonym of O. emarginata).