The Riband Wave (Idaea aversata) has a wingspan of 30–35 mm.
The wings are buff or cream with dark bands.
Two main forms exist, roughly equally abundant: the typical form has a dark band across all four wings (first 2 photos), whereas the plain form, known as ab. remutata, only has narrow cross-lines (3rd photo).
The adults fly at night from June to August, occasionally later, and are attracted to light.
Caught in my self made moth trap.
In my yard, Hilversum, The Netherlands, 25 & 26 July 2019