Perconia strigillaria, the grass wave, is a moth of the family Geometridae.

It can be found in Europe, east to the Urals, Asia Minor and China's Tarbagatai Mountains.

Antemedian and median lines of wing thick and closely approximated, sometimes confluent into a band.

is a clearer white, weakly marked form from S. E. Russia, sometimes quite markingless.

The larvae feed on Cytisus scoparius and Calluna, Erica and Ulex species.