The Conformist Lithophane furcifera
Wingspan c. 40-50mm.
A former resident in small numbers, the dark subspecies suffusa occurred in Glamorgan in the late 19th century, but is now considered extinct, the last recorded instance being in 1959.
The paler, continental nominate subspecies furcifera has been recorded as a migrant on a number of occasions, but not recently, until one in Northumberland in spring 2007.
The larvae feed generally on alder (Alnus), but also on birch (Betula), sallow (Salix) and poplar (Populus).