Appearance
The wingspan is 35–38 mm. The length of the forewings is 16–20 mm. Has no pale grey tints; the red-brown ground colour varying only to dark grey; the claviform stigma is produced as a dark dash to outer line; upper stigmata pale with partial black outlines, a black basal streak with pale patch above it; hindwing pale fuscous, paler at base; the form "achates" Hbn. has the forewing uniform red brown; while humeralis Haw. is fuscous grey with the red tints absent; ab. "nigrifusa" nov. [Warren] is wholly suffused with black, the orbicular stigma and traces of outer and submarginal lines remaining pale grey.Behavior
The moth flies in two generations from early May to September.Larva green or reddish yellow, with two dark oblique stripes on each segment, with two dark spots or blotches in front of them; lateral lines pale grey with red edges. The larvae feed on various deciduous trees and plants: "Betula" sp., "Alnus incana", "Salix" sp., "Polygonum" spp., "Chenopodium album", "Delphinium" sp., "Berberis" sp., "Brassica" spp., "Rubus idaeus", "Sorbus aucuparia", "Pisum sativum".
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