Adult (female), Genève, Switzerland, June 1979
(Photo by Paolo Mazzei)

Adult (male), Salbertrand, Val di Susa (Torino), Italy, June 2001
(Photo by Diego Reggianti)

Adult, Salbertrand, Val di Susa (Torino), Italy, June 2001
(Photo by Diego Reggianti)

Adult (male) ssp. stiberi (Gerhard, 1853), Õland Bostorp, Sweden, June 17, 2003
(Photo by Bernard Fransen, Photography of European Butterflies and Moths)

Adult ssp. stiberi (Gerhard, 1853), Nord Trøndelag Sildhopen-Elokroken, Norway, June 28, 2003
(Photo by Bernard Fransen, Photography of European Butterflies and Moths)

Adult (male) ssp. stiberi (Gerhard, 1853), Nord Trøndelag Sildhopen-Elokroken, Norway, June 29, 2003
(Photo by Bernard Fransen, Photography of European Butterflies and Moths)

Adult (male), Livigno (Sondrio), Italy, August 1989
(Photo by Fabio Cavallini)

Adult (female), Livigno (Sondrio), Italy, August 1987
(Photo by Fabio Cavallini)

Adult (male), Cervinia (Aosta), Italy, August 1988
(Photo by Fabio Cavallini)

Adult (female), Kielstrup Sø, Mariager Fjord, Denmark, June 28, 2003
(Photo by Jens Christian Schou, BioPix)

Adult (female), Vlkolinec (Ruzomberok), Slovakia, June 17, 2002
(Photo by Bernard Fransen, Photography of European Butterflies and Moths)

Egg, Fagne du Plateau des Tailles, Tailles, Luxembourg, Belgium, July 21, 2004
(Photo by Chris Steeman)