| 1 | Forewing unicolorous greyish, without distinct markings |
| | 8.0-10.0mm. Early June to early July. Forewing finely irrorate greyish white; sometimes distal half of dorsum with obscure whitish or dark spot; cilia with two blackish grey cilia-lines. Frons and vertex grey. |
| - | Forewing with distinct markings |
| | Frons and vertex dark grey. |
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| 2 (1) | Smaller species, 8.0-9.0mm. Forewing blackish grey with whitish tornal spot (male) or whitish fascia (female) |
| | Late May and June. Cilia forewing with scattered black and whitish scales. |
| - | Larger species, 9.0-12.0mm. Forewing dark brownish grey with black fascia before middle |
| | Late May and June. Forewing finely irrorate greyish white; at two-thirds often an obscure dark fascia; cilia with scattered black and whitish scales and black cilia-line apically. |
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