Oak Lutestring Cymatophorina diluta
([Denis & Schiffermüller], 1775)
Wingspan 33-36 mm.
A species of mature oak woodland, the ones occuring in Britain are a separate subspecies, hartwiegi.
Like other lutestrings, it can be variable, and there is a relatively plain, greyish form.
The single generation flies in August and September, and the caterpillars, which feed on oak (Quercus), are dull greenish yellow with a black head.