Appearance
For a key to the terms used, see :Glossary of entomology terms.The wingspan is 30–35 mm. The length of the forewings is 14–18 mm."Forewing light to dark fuscous, often with a faint ochreous or brownish tinge; the veins darker; inner and outer lines double, filled in with pale, but varying in intensity; claviform stigma of the ground colour with black line; orbicular and reniform paler with darker centres; submarginal line pale, obscure, often shown only by the dark terminal areabeyond it: hindwing whitish with dark veins and black marginal line; of the forms without any ochreous or rufous tinge, ab. ''obsoleta'' Tutt is pale grey without definite dark markings; — ab. cinerea Tutt has the grey darker, more fuscous; — ab. ''nigrescens'' Tutt has the ground colour blackish of varying degrees of intensity; the inner and outer lines are sometimes connected by a black streak: — in ab. ''unca'' Haw., the streak is thin and the two lines well separated; — ab. ''x-notata'' Haw. has the streak thick and the lines closely approximated".
Behavior
The moth flies in one generation from mid-July to early October .Larva dirty whiteish, without lines; head and plates brown. The larvae feed on various grasses and grains.
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