Northern Brown Argus
The Northern Brown Argus occurs across northern Europe and the mountains further south but the form that occurs in Scotland occurs nowhere else. This beautiful (and little-photographed) form has a white spot on the forewing and the under side spots are white without black centres. These features are controlled by a single recessive gene, seemingly present in all Scottish butterflies and a small proportion of butterlies on the County Durham coast. Butterflies in northern England lack the white spot and have small black centres to the underside spotting. This one is also unusual by its almost complete absence of orange lunules around the wing edge. Just a few faint lunules persist on the hindwings.
I was annoyed with this photograph as my depth of focus wasn't deep enough to bring the wing tips into crisp focus. My aperture was f8 but should have gone to f16.