Black Arches Moth Some Common Blues (in several of the above photos) tend towards "whitelegged-ism" but the blue male White-legged Damselfly looks very different and has totally white legs. Lymantria monacha

Black Arches moth
Black Arches moth
The Black Arches moth is named after the wavy black arches on its white wings. In the UK it flies from July to September.
Black Arches moth - pink body
Black Arches moth - white underwing
The body is often pink, as just visible here, and the under-wings are white.
Black Arches moth antennae
Black Arches moth antennae
The male, which is smaller than the female (30-40mm wingspan rather than 40-54), has wonderful feathered antennae to detect pheromones.