Did you mean: Pachynema hippocastanum
Pachycnemia hippocastanaria
Pachycnemia hippocastanaria, the horse chestnut moth, is a moth of the family Geometridae. It is found in most of Europe.
The wingspan is 28–32 mm. Adults are on wing from April to May, and again in a partial second generation in August, usually... Wikipedia
Scientific name: Pachycnemia hippocastanaria
Genus: Pachycnemia