Smooth wing surface identifies the butterfly as Brimstone. Dense long
scaling across the forewing ("powder") indicates Powdered Brimstone.
Switzerland, August 2006
Switzerland, May 2008
Switzerland, July 2006
Morocco, June 2005
Italy, May 2003
difference between the sexes are clear.
This is a widespread species occurring from north
Africa to most of Scandinavia. It is most conspicuous during the first
warm days of spring when is is one of the first butterflies on the wing
following hibernation. It flies again in summer when it feeds for
several weeks, storing energy for the forthcoming dormant period.
Towards the end of August the perfect butterflies disappear for the
winter and until the onset of spring they will not stir even on hot