An uncommon species which is endemic in north-west Scotland and the Hebrides. It can be confused with Dark Marbled Carpet and Common Marbled Carpet. Found from July to August. The status of Arran Carpet has been changed and it is now classified as a subspecies of Common Marbled Carpet. It is a race or ecotype of Dysstroma truncata which behaves as a species on some Scottish islands. Heather (Calluna vulgaris) and bilberry (Vaccinium myrtillus) are the preferred foodplants