A univoltine species, flying from early May to mid-June (Dylewska, 1987, citing Warncke, 1973). Scheuchl (in prep.) states that the species flies from March to June, and Kemp et al (2103) give a flight period from the end of April to June.
In Thessaly (Greece) Standfuss et al. (2011) report flight activity from April to June