Technical description and variation
The wingspan is 42–48 mm. Forewing rufous-brown clouded with darker; the veins black dotted with white; a slight black mark below base of cell, and a short black streak from inner margin near base; inner and outer lines blackish, double, forming black white-tipped teeth on the veins; claviform stigma blackish, acute, lying on a black streak joining the two lines; orbicular and reniform reddish grey edged with black, the reniform with some whitish in outer half; submarginal line white preceded by black wedge-shaped marks; hindwing of male whitish with the termen grey; the cellspot and veins dark; much greyer in female. Of general occurrence throughout Europe and in Asia found in Armenia, Asia Minor, W. and E. Siberia, W. and E. Turkestan and Tibet; - the form vulturina Frr., from S. Russia, has the forewing darker and variegated with white; - duplex Haw. is also a dark but unicolorous form, occurring in Scotland and the North of England; - sylvatica Bell is a grey, obscurely marked, insect without brownish tinge, from Corsica; - septentrionalis Hoffm. is a small black form from Finland, the Baltic provinces and the Ural Mts., of which moesta Stgr. from Dauria is possibly a synonym; - vicina Alph. from Central Asia is paler, more violet brown, with the markings clearly expressed; anilis Bsd. is whitish, thickly dusted with black, with no trace of red-brown tinge. [3] See also nl wikipedia
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