Photo © Andy Mitchell
Synanthedon vespiformis, the yellow-legged clearwing, is a moth of the family Sesiidae. It is found in the Palearctic realm.
The wingspan is 18–20 mm. The moth flies from April to September depending on the location.
The larvae feed on oak, but also species from the genera Populus, Aesculus and Salix.
Source: Wikipedia
The primary larval foodplants are Beech (Fagus sylvatica), birches (Betula spp.), cherries (Prunus spp.), Holm Oak (Quercus ilex), Pedunculate Oak (Quercus robur), Sessile Oak (Quercus petraea), Sweet Chestnut (Castanea sativa), Walnut (Juglans regia), willows (Salix spp.) and Wych Elm (Ulmus glabra).