Common in gardens, woodland rides, and on calcareous grassland, sand-dunes and sea cliffs throughout much of southern Britain; widely distributed and fairly common in Hampshire and on the Isle of Wight. Wingspan 35-41 mm. The main confusion species is Treble-bar A. plagiata
, but innermost fascia usually more sharply angled in A. efformata
. Larva feeds on St John's-wort.