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Colin, before I agree I take it you've looked at the shape of its backside
A good ID point - Difficult to tell apart from the less common Lesser Treble-bar (A. efformata), which has more angled inner cross-line on the forewing.
As you correctly suggest given the available image angled not on a plane
Treble-bar has elongated, pointed claspers giving rise to a narrow abdomen tip. Lesser Treble-bar has a blunter tip to the abdomen with rather shorter, curved claspers
I dont think given the angle you could conclude on this however in so far as both species go from experience I'd suggest the Lesser
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If there is no reference to abdomen then perhaps we should start identifying these two as 'Treble/Lesser Treble-bar' which would avoid having this debate every time one of them crops up.
Donald, it only works for males. There are diagrams in Waring and Townsend, Moth of Great Britain and Ireland p 125. I hope this helps.
but with a little care and practice it works perfectly well with females too. See the comparison photos on UKmoths website.
Lat/Lng: 50.7218, -3.5336
OS grid ref: SX918924
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