Coleophora adjectella is a moth of the Coleophoridae family. It is found from Scandinavia to Spain, Sardinia, Sicily and Greece and from Great Britain to Poland and Slovakia. The wingspan is 9–10 mm. The larvae feed on Crataegus species, Prunus domestica and Prunus spinosa. They mine the leaves of their host plant. The first larval case is constructed from a cut out area of an oval mine in the centre of the leaf. The second and third cases are cut out of a mine along the leaf margin. The final case is 6–7 mm long, with a bivalved, square-cut rear end. The mouth angle is about 45°. The larvae can be found from August to May in most of the range, but hibernate twice in Denmark.