1 | Forewing unicolorous shining dark greyish brown or blackish brown with bronzy, blue or violet reflections |
| |
- | Forewing yellowish brown, ochreous or yellowish orange, often with dark suffusion along costa and in apical area; sometimes the wing is suffused wholly, giving it a reddish brown appearance |
| Occasionally some purplish reflection may occur in dark parts of the forewing. |
|
2 (1) | Forewing blackish brown with shining bronze reflections, along costa and in apical area with metallic blue scales (sometimes less pronounced). Frons, vertex and thorax blackish brown with bronzy lustre |
| 8.0-9.5mm. May, June and August. Fringe forewing without cilia-line. |
- | Forewing dark greyish brown with violet reflections, without metallic blue scales. Vertex and thorax greyish brown, frons pale yellowish grey |
| 8.0-10.0mm. May, June (abroad). Fringe forewing without cilia-line. |
|
3 (1) | Forewing ochreous yellow; along costa and in apical area broadly dark purplish brown; a similar tornal dot, sometimes absorbed by dark suffusion |
| 7.0-9.0mm. Late April to early September. Forewing with two obsolete cilia-lines near apex. |
- | Forewing ochreous or yellowish orange, more or less suffused with dark or dark-tipped scales; dark dot at tornus absent |
| |
|
4 (3) | Forewing yellowish orange, densely suffused with brown scales throughout, giving the wing a reddish brown appearance |
| 7.0-9.0mm. May and June (abroad). Forewing with tornal cilia darker than rest of cilia; apical cilia with one fine cilia-line, usually distinct. |
- | Forewing yellowish orange or ochreous with dark-tipped scales along costa and in apical area |
| Apical cilia forewing without cilia-line. |
|
5 (4) | Generally smaller species, 6.0-9.5mm. Length hindwing fifteen times width half-way; fringe distinctly paler than wing. Forewing yellowish orange |
| Early May to early October. Occasionally dark scaling extending over whole forewing, giving it a speckled appearance. |
- | Generally larger species, 8.0-12.5mm. Length hindwing ten times width half-way; fringe concolorous with wing, but with slight yellowish sheen. Forewing deep ochreous |
| Late April to early September. |
|