I spotted this fritillary in north Northumberland in the middle of last month but despite looking through all the better publications, I am at a loss as to determine its type. It's obvioulsy been through the wars. What I would like to know also is whether this species is common in this part of the world as I have never seen one before here.
It is a dark green fritillary, Argynnis aglaja
The high brown fritillary looks very similar, but we can tell it is the dark green for the '3rd dot' reason explained in the 'Similar species' section on that page.
Also, the dark green is much more common in the UK than the high brown fritillary.
This distribution map shows it is fairly well recorded in the Northumberland area
And this gives a textual description for NE England, viz. 'Resident and locally abundant. Stronghold on north Northumberland dunes, especially Holy Island'
Read more on it here
- 'THE MOTHS AND BUTTERFLIES OF NORTHUMBERLAND AND DURHAM'
by T. C. DUNN & J. D. PARRACK