Pearly Underwing Peridroma saucia
Wingspan 45-56 mm.
A migrant species in Britain, varying in numbers, but usually coinciding with arrivals of other European migrants.
It can occur almost anywhere in Britain, but is generally more common in the south, and though most frequent in September and October, has appeared in all months.
The upperwing is quite variable, and the hindwings are semi-translucent, giving the appearance of a pearly sheen.
The larvae are not usually found in Britain, but are believed to feed on a number of herbaceous plants.