Silky Wave Idaea dilutaria

Wingspan 20-22 mm.

A very local species, occurring in only one or two places in Wales, and occasionally in England.

The adult is quite plain in appearance, but as the English name suggests, has a silky lustre to the wing surface.

It inhabits limestone cliffs and downs, where there are low bushes, and the larvae feed on common rock-rose (Helianthemum mummularium).

The moths fly from dusk into the night, during July.