Photo © Svyatoslav Knyazev
Eupithecia extensaria, the scarce pug, is a moth of the family Geometridae. The species was first described by Christian Friedrich Freyer in 1844. It is found in the British Isles (rare, and confined to eastern saltmarshes), Spain and eastern Europe.
The wingspan is 21–25 mm. The moth flies in both May and June.
The larvae feed on sea wormwood (Artemisia maritima).
Source: Wikipedia
The primary larval foodplant is Sea Wormwood (Artemisia maritima).