Currently unavailable. It is mentioned in South's influential work, that the term butterfly was orginally attributed to the male brimstone, due to its bright, butter-coloured wings. In spring they are a welcome and conspicious sight as they wander tirelessly in search of the paler, greenish-white females. The skittle shaped eggs are laid on alder buckthorn and purging buckthorn and the larvae do very well when sleeved out. Overwintering is not easy, but adults can be released to reinforce or populate local areas.
Larval foodplants: buckthorns (rhamnacae).
Rearing: sleeves, plastic boxes.
Photographs: egg x 200 magnification; fully grown larvae on buckthorn.
