In the name-type the ground-colour is white and the markings quite indistinct, light brown or grey-brown, the median band scarcely indicated except by transverse lines.

Our English race is less pure white, generally somewhat suffused with greyish or yellowish, but scarcely needs a separate name.

is a small yellowish-grey or brownish-grey form, in general weakly marked, and occurs in some of the Scandinavian mountains and in Shetland.

- dissoluta Strand, from Arctic Norway, is paler than the type, perhaps on an average smaller, but not so small as subfasciaria.

hebudium Weir is a pure white markingless aberration of exceedingly rare occurrence except in the Hebrides, where it is comparatively frequent.