A bivoltine species: from mid March to the end of April, and from the beginning of July to late September.
Parasites and predators:
Stubbs (2001) citing Collin (1920), suggests that the bee-fly Bombylius major may be an inquiline in nests of this species. Its kleptoparasites, or nest parasites are Nomada marshamella and Nomada flava (Osytshnjuk et al. 2008).