European blues are hard to identify and matter can be made more dificult with unusual colouring like the upper wings of the female in the left photo. The unusually cold weather allowed a close approach in Italy to capture the underside of this insect.

LHS: El Burgo river valley, Spain RHS:31st March 2008: LHS Gargano, Italy 19th April 2009

Added 4th June 2010