Scientific name: Cymatophorima diluta
Late August to September. Common across most of south England, becoming rarer towards the north and into southern Scotland.
The adults can be identified by pale grey forewings with two dark brown cross-bands. In the darker form f. nubilata the forewings are mostly brown but the cross lines are still visible. They fly from early dusk and are attracted to light.
The caterpillars can be found from April to early July feeding at night and resting between two leaves spun flat together during the day. They overwinter as eggs attached to the foodplant.
Size and Family
- Family – Thyatridae
- Medium Sized
- Wingspan Range – 30-34mm
- UK BAP: Priority species (Research only)
- Local (only found in some areas)
Caterpillar Food Plants
Pedunculate Oak (Quercus robur) and Sessile Oak (Quercus patraea)
Well-established broadleaved woodland with mature oaks
- Countries – England, Wales and Scotland
- Well distributed throughout southern England from Dorset to Kent and north to Oxford, Peterborough, the Midlands, Wye Valley, west Wales and Cumbria. Scattered records across the rest of England and Wales and southern Scotland.