| 21. | There is a well-marked dark median line on the abdomen.
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| 22. | There is also a median line of grey scales.
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| 23. | The mouth is small and the external lip is divided behind on the median line.
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| 24. | The hindwings are white with an ochreous base and a blackish subbasal and median line.
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| 25. | The yellow colour along the costa is a shade paler than below the median line.
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| 26. | Sometimes the dark spots turn the median line inconspicuous, especially when the animal is contracted.
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| 27. | The thorax is dark grey, contrasting with the dark brown edges and the median line.
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| 28. | Thorax and tegulae shining greyish brown with reddish gloss, thorax with a white median line.
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| 29. | It straddles the median line between the British and Norwegian sectors of the North Sea.
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| 30. | The forewings are pale gray with a narrow dentate median line and numerous scattered brown scales.
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