| 1 | Forewing with termen concave, occasionally nearly straight |
| | 25.0-40.0mm. Late |May to early October. Pronounced sexual dimorphism. Forewing in male greyish, but more ochreous costally and apically, brown-violet in female. Also labial palp and cell of forewing show marked differences between both sexes. |
| - | Forewing with termen more or less convex |
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| 2 (1) | Forewing without dark transverse lines and dark discal spots |
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| - | Forewing with one or two dark transverse lines (occasionally weak) and with one or two dark discal spots |
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| 3 (2) | Frons almost smooth. Forewing unicolorous grey, somewhat glossy |
| | 15.0-25.0mm. Late May to early November. In female labial palpus distinctly shorter. Frons and vertex ochreous yellow. |
| - | Frons with projecting tuft of scales. Forewing greyish brown, along dorsum paler or whitish sprinkled, not glossy; veins more or less streaked dark brown |
| | 15.0-22.0mm. June and October (indoors). Alien. Labial palpus in female shorter. Frons and vertex whitish. |
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| 4 (2) | Forewing with basal area whitish with a slight pinky tinge, rest of wing for the greater part darker |
| | 25.0-38.0mm. Late April to mid September. Forewing with two dark brown transverse lines, oblique, dentation not sharp; discal spots absent. |
| - | Forewing with basal area not paler than rest of wing |
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| 5 (4) | Hindwing brown, darker towards apex and termen; cilia grey, not glossy |
| | 25.0-38.0mm. Late April to mid September. Forewing with length costa two and a half times greatest width wing; brown; two blackish brown transverse lines, dentated sharply; first blackish discal spot small, second larger. |
| - | Hindwing brownish white or whitish, often dark towards apex and termen; cilia white to greyish white, glossy |
| | Forewing with costa three times longer than greatest width wing, occasionally slightly more than two and a half times. |
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| 6 (5) | Forewing greyish violet with large yellowish spot (edged reddish brown) between both transverse dark lines |
| | 21.0-32.0mm. Late May to early July (indoors). Alien. Forewing with two dark transverse lines, weakly dentate, the second pale edged distally; two small black discal spots. |
| - | Forewing from whitish ochreous through brown to nearly blackish grey, without large yellowish spot |
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| 7 (6) | Hindwing with common stalk of veins 7 and 8 (originating from vein 6) to less than a quarter. Forewing greyish brown |
| | 21.0-32.0mm. Late May to early July (indoors). Alien. Forewing with two brownish transverse lines, dentate, first pale edged basally, second pale edged distally; only one large black discal spot. |
| - | Hindwing with common stalk of veins 7 and 8 (originating from vein 6) to about middle. Forewing from whitish ochreous to nearly blackish |
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| 8 (7) | Forewing comparatively narrow, in male with length costa three times greatest width of wing, in female three and a half times. Hindwing with vein 4 absent |
| | Male 19.0-27.0mm, female 29.0-37.0mm. Mid June to early September. Forewing in male whitish ochreous, tinged brownish towards costa, in female brownish, often heavily suffused blackish; first transverse line obsolete, second line weak, formed of more or less distinct dark streaks on veins; blackish brown discal dots placed in a pale longitudinal streak, distal one sometimes pale-centred; dots often absent in male. |
| - | Forewing comparatively broad, in male with length costa slightly more than two and a half times greatest width of wing, in female three times. Hindwing with vein 4 present |
| | Male 21.0-31.0mm, female 27.0-43.0mm. May to August (Central Europe). Colour and markings of wing similar to A. zelleri. |
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