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Dark-barred Twin-spot Carpet
Xanthorhoe ferrugata (Clerck, 1759)
Geometridae: Larentiinae
1725 / 70.052
Photo © Kevin Leighton,  20/05/2013 - Stow Bardolph

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Similar Norfolk Species
Red Twin-spot Carpet
Xanthorhoe spadicearia
Forewing: 12-13mm.
Flight: Two Generations. May-Jun. Jul-Aug.
Foodplant:   Herbaceous plants.
Red List: NT (Near Threatened)
Ex Status: Common
Verification Grade:  Adult: 2
Norfolk Status
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.

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 apparently rare and should be treated as indistinguishable without dissection of the genitalia.

Using caution, only classic examples with solid black cross-bands 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 2021.

Latest 5 Records
Date#VC10k Area
25/08/2021128TF92 - Fakenham/Ryburgh
25/08/2021227TG11 - Drayton/Swannington
24/08/2021127TG11 - Drayton/Swannington
21/08/2021128TF92 - Fakenham/Ryburgh
20/08/2021128TF63 - Snettisham/Dersingham
Further info: Xanthorhoe ferrugata
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