Wingspan 38-44 mm. A variable species, with forewings ranging from pale buff to reddish-brown. The blackish twin spots are usually obvious, but in some forms, including ab. immaculata, these are reduced to barely discernible rufous marks, or obsolete. The caterpillars feed in early summer on various trees, including oak (Quercus), aspen (Populus tremula) and sallow (Salix).
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