Common in oak and other deciduous woodland throughout Britain, most frequent in the south-east. Relatively frequent in Hampshire and the Isle of Wight, wherever there are oak trees. Wingspan 14-22 mm. The well-developed and conspicuous pre-tornal marking and the purplish ocellus distinguish C. splendana from C. fagiglandana. Larva feeds within fruit of Oak and Sweet Chestnut, over-wintering in a cocoon.
The abundance in each month is indicated as follows:
No records
Very occasional
Irregular
Uncommon
Off-peak, but not unusual
Off-peak, but not unusual
Main flight time