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Dark-barred Twin-spot Carpet
Xanthorhoe ferrugata (Clerck, 1759)
Geometridae: Larentiinae
1725 / 70.052
Photo © Peter Tilley

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Similar Species
Red Twin-spot Carpet
Xanthorhoe spadicearia
Forewing: 12-13mm.
Flight: Two Generations. May-Jun. Jul-Aug.
Foodplant:   Herbaceous plants.
Red List: Near Threatened (NT)
GB Status: Common
Verification Grade:  Adult: 2
Believed to be over-recorded in Norfolk.
Very similar to Red Twin-spot Carpet, which has a dark-barred form.

The notch on the inner edge of the cross-band, close to the costa, has proven to be an unreliable method to identify this species.

Can be separated by the underside of the forewing being uniform grey with little contrast. Red Twin-spot Carpet shows a contrasting pattern with deep ginger colouration towards the apex of the underside.

Red Twin-spot Carpet also has a dark-barred form, leading to confusion, however a red-barred form of Dark-barred Twin-spot Carpet is rare and should be treated as indistinguishable without dissection of the genitalia.

Only classic examples should be assigned to this species without dissection of the genitalia.

Recorded in 65 (88%) of 74 10k Squares.
First Recorded in 1873.
Last Recorded in 2024.

Latest 10 Records
19/05/2024127TG10Cringleford (UEA)
18/05/2024128TF92Great Ryburgh
11/05/2024128TF62King's Lynn
08/05/2024127TG32Neatishead / Barton Broad
05/05/2024128TF70Cockley Cley
Further info: Xanthorhoe ferrugata
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