70.051 (1724) Red Twin-spot Carpet Xanthorhoe spadicearia ([Denis & Schiffermüller], 1775)

Resident. Scarce.
Flight period

Lennon (1863) stated it was very common in his 'List of Lepidoptera taken near Dumfries.' Gordon (1919) found it frequently came to light and could be found occasionally by beating. Earliest date was 14th May 1911.
From 1975 to 1987 it was caught at five of the Rothamsted stations, Bridge of Dee and Penninghame not recording it.
One was found at Troston on 7th June 1979.
From 1996 to 2010 there were thirty records from a number of widely scattered sites across the region.
Life cycle
One generation. Overwinters as a pupa. Larvae are present July and August.
Larval foodplants
Bedstraws and Ground-ivy.
This moth is very similar to the red-banded form of Dark-barred Twin-spot Carpet. The notch in the inner edge of the median fascia of the forewing near to the costa mentioned in Skinner (1984, 1998) and Waring et al (2003) as a distinguishing feature of Dark-barred Twin-spot Carpet from Red Twin-spot Carpet has been proved not to be a reliable feature as both species can show it. The chalky-white edging to the brighter cross-band on the forewing is much thicker than in X. ferrugata which usually has off-white or buff edging which is sometimes hard to detect. The red central fascia tends to be mottled in this species, whereas in the typical form of ferrugata it is usually more uniform. The underside is generally paler and more boldly marked, with the narrow pale post-median fascia more prominent than in ferrugata, especially on the forewing. Some moths may be indeterminate and would require their genitalia checking.
A wide variety.
Recorders' notes
Great care is needed in separating this species from Dark-barred Twin-spot Carpet. Use the criteria above.
© Keith Naylor per A B Duncan, Troston, 7 June 1979

Local distribution map

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Distribution map displays records from the National Biodiversity Network (See terms and conditions).

The following datasets are included:

  • Butterfly Conservation - Macro-moth provisional distribution for the British Isles (excluding the Republic of Ireland) from the National Moth Recording Scheme
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