As recorded in my PD viewtopic.php?f=29&t=7459&start=340#p99137, I photographed some unusual blues, while searching for Adonis Blues at 'The Holies', Streatley, Berks, yesterday (5th June)
From information on the species pages of this site and an illustration in Howarth (1973), I believe these may be bellargus X coridon hybrids, known as 'Polonus'
Any further thoughts welcome.
Mike
Unusual Blues
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