Light Crimson Underwing Catocala promissa
([Denis & Schiffermüller], 1775)
Wingspan 60-65 mm.
Like most of the British Catocala species, this moth can be attracted to light as well as sugar.
Oak (Quercus) is the larval foodplant.
It is a rare species, only occurring in parts of the southernmost counties where oak woodlands abound, and is on the wing during July and August.