| 1 | Forewing white, unmarked, occasionally with pale yellow scaling |
| | 9.0-12.0mm. Late May to early September. Forewing with yellow scales sometimes forming an obscure fascia in apical area. Hindwing greyish white; cilia white. Frons, vertex and scape pure white, flagellum ochreous grey. |
| - | Forewing white with blackish brown markings and a black apical spot |
| | Hindwing greyish brown, sometimes whitish; cilia concolorous, white-tipped. Frons, vertex and scape pure white, flagellum ochreous grey. |
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| 2 (1) | Forewing with oblique blackish brown spot from middle of costa, an indistinct smaller one from before middle of dorsum |
| | 7.0-10.5mm. From June to August. Forewing with costal and dorsal marks sometimes meeting to form an angulated fascia. |
| - | Forewing without dark spot from middle of costa, dorsal spot indistinct |
| | 9.2-12.0mm. June and July. |
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