| 1 | Forewing with yellowish fascia in basal area extending from costa at least to fold |
| | 13.0-16.0mm. Early July to late September. Forewing dark brown with yellow markings consisting of small spot at extreme base, incomplete fascia in basal area, broad fascia at one-half narrowing at costa and usually reaching to dorsum, complete fascia in distal area. |
| - | Forewing with yellowish fascia in basal area reduced to a spot or only a few scales just below costa |
| | |
| |
| 2 (1) | Forewing with yellowish median fascia comparatively narrow, about one-third of wing-width broad, usually not reaching dorsum |
| | 11.0-15.0mm. Late June to mid September. Forewing blackish brown with yellowish markings consisting of small spot at extreme base, fascia in basal area reduced to small spot or only a few scales below costa, narrow fascia at one-half, fascia in distal area usually interrupted. |
| - | Forewing with yellow median fascia comparatively broad, about one-half of wing-width broad, usually not reaching dorsum |
| | 13.0-16.0mm. July and August (in Great Britain). Forewing blackish brown with yellow markings consisting of small spot at extreme base, fascia in basal area reduced to spot of variable size below costa, rather broad fascia at one-half, fascia in distal area usually interrupted. Up to the present no certain records known from The Netherlands. |
| |