Marbled Beauty Bryophila domestica
Wingspan 20-25 mm.
Showing a good example of protective camouflage, this species rests by day on stone walls and rocks.
Fairly common over the larger part of Britain, it is somewhat more local in Scotland, and occurs in a range of habitats, including suburbia.
The flight time is during July and August, and the adults, which vary somewhat in size, are frequent visitors to light.
The larvae feed on lichens, especially rock-growing species like Lecidia confluens.