| 1 | Forewing unicolorous or nearly unicolorous, without markings |
| | Forewing usually shining bronzy gold, brownish or whitish, sometimes with traces of markings, but these are never longitudinal. |
| - | Forewing with markings |
| | Forewing sometimes whitish, yellowish or slightly purplish with two longitudinal streaks, occasionally indistinct. |
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| 2 (1) | Forewing deep dark purplish brown or ferruginous brown |
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| - | Forewing golden, bronzy, whitish, yellowish or greyish |
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| 3 (2) | Vertex pure white |
| | Form with forewing unicolorous ferruginous brown with faint purplish tinge. Flagellum ringed white and blackish brown, scape white. Frons shining white. See also couplet 49. |
| - | Vertex pale ochreous |
| | Form with forewing unicolorous deep dark purplish brown. Flagellum ringed whitish yellow and dark brown, scape ochreous. Frons shining ochreous white. See also couplet 43. |
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| 4 (2) | Forewing shining greenish brassy golden, pale golden or deep dark golden |
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| - | Forewing not or hardly shining; pale ochreous, pale greyish violet, pale straw yellow or creamy white |
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| 5 (4) | Smaller species, 8.0-9.0mm |
| | Late April to mid July. Forewing shining greenish golden. Flagellum weakly ringed white and greyish brown, scape ochreous. Frons yellowish white, vertex pure white. |
| - | Larger species, 9.0-13.5mm |
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| 6 (5) | Forewing coppery with greenish gloss. Vertex reddish brown to ferruginous |
| | 9.0-13.5mm. Late May to early June. Flagellum ringed white and purplish brown, scape ochreous. Frons reddish brown. |
| - | Forewing shining metallic pale golden or deep reddish golden. Vertex from pure white to ochreous, without reddish tinge |
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| 7 (6) | Flagellum distinctly ringed whitish and dark brown (in worn specimens less distinct), some sub-terminal segments white |
| | Unicolorous form (f. splendida Reutti). Forewing pale golden. Vertex pale yellowish to ochreous; scape whitish to pale ochreous. See also couplet 54. |
| - | Flagellum unicolorous brown or indistinctly ringed white and brown, sometimes partly ringed |
| | Unicolorous form. Forewing deep dark golden. Vertex pure white, occasionally pale ochreous; scape pale ochreous. See also couplets 41 and 54. |
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| 8 (4) | Vertex ochreous to ferruginous |
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| - | Vertex white, whitish or ochreous white |
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| 9 (8) | Scape silvery white |
| | 9.0-14.0mm. May to July (in Britain). Forewing slightly shining pale grey to ochreous grey, elder specimens tending to become more yellowish. Frons silvery white; vertex ochreous to ferruginous. Flagellum weakly annulated white and pale brownish grey. Tho |
| - | Scape yellowish |
| | 8.0-11.0mm. Mid May to early July. Forewing somewhat shining pale grey, especially females (and in general elder specimens) more ochreous rather than grey. Frons shining creamy white; vertex ochreous to ferruginous-yellow. Flagellum ringed white and brown |
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| 10 (8) | Forewing creamy white. Vertex pure white |
| | 9.0-12.0mm. Form with unicolorous forewing, only a few blackish scales near apex. Flagellum annulated white and blackish brown; scape white. Frons yellowish white. See also couplets 47 and 56. |
| - | Forewing pale ochreous brown, pale straw yellow or pale greyish violet. Vertex whitish, beige or pale ochreous yellow |
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| 11 (10) | Forewing pale ochreous brown with faint reddish brown suffusion between disc and apex. Vertex whitish |
| | 8.0-10.0mm. Late April, May. Flagellum pale ochreous, weakly ringed brown. Frons white. Thorax ochreous yellow. |
| - | Forewing pale straw yellow or pale greyish violet |
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| 12 (9) | Larger species, 9.5-10.5mm. Forewing pale straw yellow |
| | Late May, June. Frons and vertex pale ochreous yellow. Flagellum ringed white and brown. Thorax yellowish grey. |
| - | Smaller species, 7.0-9.0mm. Forewing pale greyish violet |
| | Late July to early September. Frons shining brassy white; vertex ochreous white. Flagellum weakly ringed ochreous and brown. Thorax shining ochreous grey. See couplet 38. |
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| 13 (1) | Forewing white (sometimes suffused pale purplish brown) with two golden or pale golden longitudinal streaks extending from base to between one-third or three-fifth |
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| - | Forewing marked and coloured otherwise |
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| 14 (13) | Forewing pale greyish violet; both longitudinal golden streaks extending from base to three-fifth, often ill-defined; without further golden markings |
| | See couplet 36. |
| - | Forewing white, often suffused pale purplish brown ; longitudinal golden streaks from base to one-third or one-half, sometimes only one streak extending to three-fifth; with additional golden markings |
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| 15 (14) | Flagellum distinctly annulated white and blackish brown |
| | 7.0-9.0mm. Early June to mid August. Forewing white, suffused pale purplish brown. Frons shining brassy white; vertex white. Thorax white, tegulae golden ochreous. |
| - | Flagellum whitish, not annulated or with rings hardly discernible |
| | 7.0-9.0mm. Late May to early August. Forewing white with a few brown scales near apex. Frons and vertex white. Thorax white, tegulae golden ochreous. |
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| 16 (13) | Forewing with white, yellowish or silvery dorsal streak, uninterrupted for at least basal two-fifth of dorsum |
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| - | Forewing without well-defined pale dorsal streak |
| | If occasionally dorsum forewing paler, one or more darker dorsal spots present in basal half. |
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| 17 (16) | Forewing with white dorsal streak continuous to tornus |
| | F. aurivittella Haworth. See also couplets 31 and 53. |
| - | Forewing with pale dorsal streak not extending to tornus, but interrupted or terminated by dark fascia |
| | Pale dorsal streak in forewing occasionally not completely interrupted. |
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| 18 (17) | Forewing shining dark purplish brown with metallic reflections; dorsal streak silvery white or occasionally shining pale yellowish |
| | 8.0-10.0mm. Early June to early August. Forewing with broad almost vertical median fascia, slightly darker than rest of wing; white dorsal streak before dark fascia with basal three-quarters distinctly narrower than distal fourth. Frons and vertex whitish |
| - | Forewing not shining with metallic reflections |
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| 19 (18) | Forewing with dorsal streak yellowish white to ochreous white |
| | 10.0-14.0mm. Mid May to early July. Forewing dark brown with purplish reflections; dorsal streak before dark fascia with basal three-quarters distinctly narrower than distal fourth; an outwardly oblique blackish brown fascia, not reaching costa or interru |
| - | Forewing with dorsal streak pure white |
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| 20 (19) | Forewing with dorsal streak not continued beyond dark median fascia |
| | 10.0-13.0mm. Late May to mid August (in Central Europe). Forewing dark violet brown; dorsal streak broadened distally, tornal part sometimes represented by pale shade; a broad blackish brown median fascia. Frons white; vertex pure white. Flagellum ringed |
| - | Forewing with dorsal streak continued beyond dark median fascia |
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| 21 (20) | Forewing with pale dorsal streak interrupted by a dark fascia, at least distinct to half-way wing |
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| - | Forewing with pale dorsal streak interrupted by a dark spot |
| | Forewing with dark spot interrupting pale dorsal streak not clearly continued into a fascia; sometimes dark interruption incomplete. |
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| 22 (21) | Forewing with basal half above white dorsal streak almost unicolorous dark; dorsal streak from base to dark fascia of equal width; dark fascia steep |
| | 9.0-12.0mm. Mid May to early July. Forewing purplish greyish brown. Frons yellowish white; vertex white. Flagellum ringed yellowish white and pale brown, sometimes more distinctly on medial segments; scape whitish. Thorax white, tegulae pale brown. |
| - | Forewing with basal half above white dorsal streak paler towards costa; dorsal streak before dark fascia with basal three-quarters distinctly narrower than distal fourth; dark fascia curved outwards |
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| 23 (22) | Forewing with dark median fascia pronounced, curved outwards and meeting or nearly meeting costa at three-fifth to two-thirds; between costa and dark basal streak (edging pale dorsal streak costally) usually predominantly brown |
| | 10.0-12.0mm. Late May to early September. Forewing brown, somewhat ferruginous, towards costa suffused creamy. Frons creamy, vertex white,. Flagellum ringed white and blackish; scape white. Thorax white, tegulae golden brown. |
| - | Forewing with dark median fascia becoming ill-defined as it curves towards apex, meeting costa at four-fifth; between costa and dark basal streak predominantly creamy |
| | 9.0-12.0mm. Mid June to early September. Forewing usually predominantly creamy, somewhat shining; often suffused brownish, particularly in apical quarter. Frons shining yellowish white; vertex pure white. Flagellum ringed white and blackish; scape white. |
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| 24 (21) | Forewing ochreous, somewhat shining, towards costa ochreous white; white dorsal streak ill-defined |
| | 10.5-14.0mm. Late July to early October. Frons yellowish white, vertex white or whitish. Flagellum ringed white and dark brown; scape white. Thorax white, tegulae brownish. |
| - | Forewing dark purplish brown, usually with purplish reflections; white dorsal streak well-defined |
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| 25 (24) | Forewing with white dorsal streak from base to one-third, usually tapering; costal strigulae ochreous yellow |
| | 9.0-11.0mm. Late June to early August. Forewing ferruginous brown with some purplish reflections particularly in apical area; dorsal streak beyond dark interruption indistinct, ochreous, not white. Frons shining white, vertex white. Flagellum ringed white |
| - | Forewing with white dorsal streak from base interrupted half-way, not tapered; costal strigulae white |
| | 10.0-13.0mm. July and August. Forewing dark purplish brown with purplish reflections; white dorsal streak continued distinctly beyond dark interruption. Frons shining white, vertex white. Flagellum ringed white and dark brown; scape white. Thorax white, t |
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| 26 (13) | Forewing with ground colour shining dark purplish brown with metallic reflections. |
| | Specimens with reduced pale dorsal streak forewing. See couplet 42. |
| - | Forewing with ground colour golden, white or creamy |
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| 27 (26) | Forewing golden with white or whitish golden markings or the reverse |
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| - | Forewing white or creamy, usually with brown or dark brown markings |
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| 28 (27) | Forewing golden with three straight pure white fasciae |
| | 8.0-9.0mm. Early May to early June. Frons and vertex white. Flagellum ringed white and shining brown; scape white. Thorax and tegulae coppery. |
| - | Forewing marked otherwise |
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| 29 (28) | Forewing with costal area unicolorous whitish golden |
| | 10.0-13.0mm. Late May to early July. Forewing whitish golden; markings golden: dorsal spot at one-third connected with basal streak, outwardly oblique streak from middle of dorsum and tornal spot. Frons shining white; vertex ochreous white. Flagellum ring |
| - | Forewing with costal area golden with white markings, occasionally costal area pure white |
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| 30 (29) | Thorax and tegulae ochreous golden. Forewing with white fascia in distal half, occasionally interrupted |
| | 10.0-12.0mm. Late May to early October. Forewing typical form white with three golden fasciae: first near base, second widely furcate towards costa, third terminal, enclosing two white terminal spots. F. literella Haworth with white costal area, go |
| - | Thorax and tegulae white. Forewing usually without white fascia in distal half |
| | 10.0-12.0mm. Late May to early September. Forewing typical form golden with one white fascia at one-third; one basal, three costal and one tornal spot, all white. For unicolorous form see couplet 31, for f. aurovittella Haworth see couplet 41. In a |
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| 31 (27) | Forewing without distinct dark median fascia, but strigulated dark or forewing only with dark incomplete basal streak |
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| - | Forewing with dark median fascia, curved or angulated, sometimes interrupted or connected with other dark markings |
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| 32 (31) | Forewing unicolorous creamy, except for traces of brown basal streak |
| | F. ossea Haworth. Forewing with some brown scales near apex. See couplets 34 and 47. |
| - | Forewing white, strigulated dark brown |
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| 33 (32) | Forewing with distinct fine and small strigulae in variable numbers |
| | 8.0-11.0mm. Mid May to early August. Forewing often with diffuse brownish basal and terminal streaks. Frons whitish; vertex white, mixed darker anteriorly. Flagellum whitish, ringed dark brown, often paler towards apex or unringed beyond two-thirds; scape |
| - | Forewing with strong strigulae, in distal half reticulated; strigulae at dorsum enlarged to two or three spots |
| | 7.0-10.0mm. Mid May to late June. Frons and vertex whitish. Flagellum ringed white and brown to apex; scape white. Thorax and tegulae white. |
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| 34 (31) | Smaller species, 6.0-10.0mm |
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| - | Larger species, 10.0-13.0mm |
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| 35 (34) | Thorax and tegulae ochreous. Forewing shining ochreous with brown markings |
| | 7.0-10.0mm. Mid May to mid June. Forewing with three irregular and often incomplete fasciae. Frons and vertex white. Flagellum ringed white and brown; scape yellowish white. |
| - | Thorax and tegulae white. Forewing shining white in basal half, yellowish white in distal half; with brown markings |
| | 6.0-10.0mm. Early June to early August. Forewing with basal half almost unmarked; brown fascia just beyond middle, interrupted at three-quarters; apical fourth of wing with interconnected brown markings. Frons and vertex white. Flagellum ringed white and |
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| 36 (34) | Forewing white, somewhat creamy in costal half; markings brown, slightly golden; fascia extending to half of wing |
| | 11.0-13.0mm. Late May to early August. Forewing with dorsal spot at one-quarter, often connected with base along fold; median fascia often connected with markings in distal half of wing. Frons shining ochreous; vertex white. Thorax and tegulae shining whi |
| - | Forewing white (also costal half); markings greyish brown; fascia often reaching costa |
| | 10.0-12.0mm. Late May to early August. Forewing with small or obsolete dorsal spot at one-quarter, not connected with wing base; fascia distinct, often incomplete or interrupted near costa. Frons shining ochreous white; vertex white. Flagellum ringed whit |
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