A very rare
and local species in Belgium, only known from the provinces of Namur and Luxembourg.
larva mainly feeds on Betula, especially on mature trees. It overwinters as a pupa underground, sometimes more than one year.
adults fly in one generation a year; starting from early March till mid
April. They are active during the night and come to sugar and
Namen, Neuville, 15 March 2009.
(Photo © Alfons Huysmans)