The group of moths known as China-marks are unusual in that their larvae are entirely aquatic, feeding on water plants.
The Brown China-mark (wingspan: 22-30 mm) is quite variable, and some examples are quite dark and dull-looking, whereas others can have delicately-patterned white patches and streaks.
This moth species is fairly common around ponds, lakes and canals throughout The Netherlands.

De Snip, Hilversum, The Netherlands, 18 June 2013