70.131 (1809) Twin-spot Carpet Mesotype didymata didymata (Linnaeus, 1758)

Resident. Common.
Flight period

The earliest notification of this species is published in Stephens (1829) with the Rev. William Little recording it at Raehills (VC72) stating it to be common.
Somerville (1858) while on a visit to the Moffat area found it to be common in fir woods in August. Lennon (1863) recorded it as very common around the Dumfries area. K. J. Morton of Edinburgh (1900) while on a visit in July 1899 to Wigtownshire had found this species in the Monreith area. Gordon (1919) also found it common and generally distributed in July around Corsemalzie, Wigtownshire. Earliest date was 17th July 1911.
Sir Arthur Duncan (1909-84) during his lifetime had found it at Closeburn, Tynron, Castlehill, Dumfries and Kirkconnell Flow. Russell (1944) while staying at Gatehouse of Fleet during 1942-43 had found it locally in great numbers.
It was not until August, 1964 that the next records came along from the Isle of Whithorn (VC74).
During 1974-93 the seven Rothamsted stations recorded 270 records between them to show that it is a widespread moth.
From 1992 to 2010 the regular trapped sites at Kirkton and Cally Woods recorded a number of the 160 records, but most of them were from widely scattered sites like Dunskey Castle and Milton Point in the west to Carrifran Valley in the north-east.
Life cycle
One generation. Overwinters as an egg. Larvae are present April to June.
Larval foodplants
Bilberry, Cow Parsley, Heather, Red Campion and sallows and other herbaceous plants.
The course texture of the forewing with the twin-spots located inside the scalloped outermost cross-line are diagnostic.
Light upland and lowland woodland, moorland, sand-dunes and sea-cliffs.
© Peter Norman, Auchencairn, 9 July 2011

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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