Technical description and variation
''C. affinis'' L. (47 d). Forewing fulvous or redbrown, more or less shaded with grey; inner and outer lines dark, conversely edged with paler, marked on costa generally by streaks of white scales; stigmata paler redbrown, undefined, the orbicular round, the reniform 8-shaped, with dark centres; submarginal line pale, waved, preceded by a deeper brown cloud, followed on costa by white scales, beyond which at the apex are two black spots; a row of small black marginal spots; hindwing blackish, black on terminal half; the fringe yellowish; instead of the red tints, examples occur of a greenish grey or pale brown colour = ab. ''suffusa'' Tutt (47 d), and ab. ''ochrea'' Tutt (47 d); a less common aberration occurring on the continent, but not confined to females as Spuler states; — ab. ''nigrimaculata'' ab. nov. (47 d) is marked by patches of black scales in the basal area along cell and vein 1, before and below the orbicular stigma, beyond the reniform in the angle of outer line, and more slightly before the termen. The Japanese examples are much larger than European = magna Stgr. (47 d); the white costal streaks are always less strongly developed, and are often altogether absent, the insect being more unicolor. or less uniformly red brown = ab. ''unicolor'' Stgr. (47 e). Larva pale green, with 5 white lines; the tubercles and the spiracles black. Warren. W. in Seitz, A. Ed., 1914 ''Die Großschmetterlinge der Erde'', Verlag Alfred Kernen, Stuttgart Band 3: Abt. 1, Die Großschmetterlinge des palaearktischen Faunengebietes, Die palaearktischen eulenartigen Nachtfalter, 1914 The wingspan is 28–33 mm.Biology
Adults are on wing from June to August in one generation. The larvae primarily feed on united leaves of '' Ulmus'' species, but have also been recorded on '' Quercus'', ''References
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