Scalloped Hook-tip Falcaria lacertinaria
Wingspan 27-35 mm.
This species has an unusual resting posture, with the wings held in an arch over the back, resembling a dried leaf.
It is mainly a woodland species, and feeds as a larva on birch (Betula).
Double-brooded, the adults can be found on the wing in May and June, then again in August.
It is reasonably common over much of Britain in suitable habitat.