([Denis & Schiffermüller], 1775)
Wingspan 25-46 mm.
Sexually dimorphic, the females being generally much larger and plainer in appearance than the males.
It is locally distributed in the southern half of England, occupying coastal reedbeds.
The moths fly in July and sometimes in August, and can be attracted to light, though the males are quite sedentary.
The larvae feed internally on the stems of common reed (Phragmites australis) and reed sweet-grass (Glyceria maxima).