This is a univoltine species, flying from June to August (Bogusch & Hadrava, 2018; Westrich, 2018)
Conservation: Celary (1990) writes: It is a cleptoparasitic bee species, which was only noted in Poland at the beginning of the 20th century at four localities in Wielkopolska, in Lower Silesia and in the Kraków-Czestochowa Upland. For several decades its occurrence has not been confirmed in the country. Its decline may be attributed to the elimination of nesting places of its host Colletes nasutus due to developing agriculture, afforestation of waste land and intensification of urbanization processes.