Callophrys rubi

A beautiful postcard sent by Anja of Finland. It shows a callophrys rubi, a butterfly in the family Lycaenidae.

This is from Wikipedia : It is a small butterfly, which is still widespread across most of the UK, although many colonies have been lost in recent years. Widespread across Europe and North Africa and eastwards through Asia well into Siberia. The upperside is a uniform dull brown with two paler patches on the male's forewings made up of scent scales. The undersides are a bright green with a thin white line, often reduced to a faint row of dots or even missing altogether. They never rest with their wings open.