D. oo L. (47 k). Forewing pale yellow, slightly dusted with ferruginous; veins and lines and outlines of stigmata ferruginous: fringe mottled with the same colour; hindwing yellowish white, washed with grey and darker before termen; in the form
ferruginago Hbn. the base and the space between outer and submarginal lines are dark: in the ab.
renago Haw. (47 k) there is a ferruginous fascia before inner line and between median shade and submarginal line, united along inner margin;
sulphurea Stgr. is wholly sulphur yellow: the ferruginous scales are sometimes replaced by grey = ab.
griseago Schultz. Larva black-brown, clotted with white; lines white; the dorsal irregularly blotched: the subdorsal slender; the spiracular broad. The
wingspan is 32–39 mm. ==Biology==