Photo © Ilia Ustyantsev
Idaea sylvestraria, the dotted border wave, is a moth of the family Geometridae. The species was first described by Jacob Hubner in 1799. It is found in Europe.
The species has a wingspan of 20-23 mm. The adults fly in July and August.
The larvae feed on dandelion and knotgrass.
Source: Wikipedia
Description to be completed.