Glaucopsyche alexis

Male, Switzerland, April 2008

Male, Switzerland, April 2009, showing the variation in border width

Switzerland, April 2009

Male, Switzerland, April 2008

Female, May 2005, Switzerland

Mating pair, Switzerland, May 2006

Female, Switzerland, May 2006

Female, Switzerland, May 2006

Female, May 2004 (my hand is there to stop the video camera focusing on the grass behind, which is often a problem with butterflies that perch on grass and flowers)
Update: In 2006 I discovered this species for the first time in my local region, Gryon (just the one individual so far - the female in pictures 3 and 4 above).