This species is widely distributed across the country but as the adults usually spend much of their time high in trees they are easily overlooked. They are easier to notice when they are on smaller Oaks in open ground as they are over the Railway line at Stour Wood, Wrabness and as I saw them on 19 July 2011 on a hill opposite the visitor centre at Marks Hall, Coggeshall.

My 19 July 2011 visit was at mid day and the butterflies were still for most of the time, between short flights across the same tree. There were about five butterflies in one smallish Oak tree and all looking very worn. Their wings did not open fully as for basking, but only about half way before taking off.

There is only one brood per year with the adults in flight in July and August. The Butterfly over-winters as an egg. Food plants are Oak trees.