Synanthedon flaviventris, the sallow clearwing, is a moth of the family Sesiidae.

By the second autumn the frass is pressed into cavities between the bark and wood, and the pear-shaped gall is noticeable.

[4][5] Before pupation, the larva makes an exit hole and the pupa (11–13 mm long) is yellowish and formed head down in a chamber above the gall.

The species has a two-year life cycle, with adults present mostly in even years.

[7] and Russia (southern Siberia, Baikal, Irkutsk, Chaborowsk, Ussuri).