A univoltine species. From the limited observations to date British females H. rubicola have been seen flying from July to August. Elsewhere it has been recorded from June-September in
France and Switzerland (Perez, 1890; Benoist, 1929; Amiet et al., 2004). In southern
Iberia it is at least bivoltine, and probably multivoltine, with adults being
recorded from late March to early November.
Mavromoustakis (1948; 1952) reports adult activity between May and September in Cyprus