Synanthedon scoliaeformis, the Welsh clearwing, is a moth of the Sesiidae family. It is found in almost all of Europe (except the Netherlands, Portugal and the western part of the Balkan Peninsula), to the east by Russia to Japan.
The size is 30-36 mm. Females have an orange tail, while males are dark brown. Both have two narrow yellow rings on their abdomen. Adults are on the wing in June and July and fly during the day.
The larvae feed on Betula verrucosa, Betula pubescens and Betula pendula. They pierced in mature trees and fed the bark inside.