Cleptoparasitic: Hosts; Colletes impunctatus (Alfken 1913, Lefeber 1979) and Colletes floralis (Niemelä 1947) are both cited as hosts (Westrich 1989; Scheuchl 2000; Amiet et al. 2007; Westrich, 2018).
Its distribution is patchy, and the species may have more hosts (Bogusch & Hadrava, 2018)