The darker markings of this very common greyish moth are often very obscure, but the white outline of the reniform stigma, and the white submarginal line are usually distinct. The caterpillar varies in colour, but generally is some shade of dull brown or greenish, with the usual dots greyish or green tinged. The central line on the back is dusky, speckled with white, and the stripe low down on the sides is yellowish, greenish, or dingy brown; head ochreous brown marked with darker or greenish. Although it is exceedingly partial to the cabbage and other plants of the kind, it will feed upon almost every sort of low herbage, wild or cultivated. Barrett states that it has been found feeding on oak. I have taken it from birch in the garden, and it is known to eat leaves of almost any tree or shrub that may be offered to it in confinement. July to October. The moth is out in June and July, and sometimes there is an emergence in September. The species occurs over the whole of the British Isles, and abroad its range extends to India, Amurland, and Japan. (Plate 120, Figs. 3[male], 6[female].)
The striking feature of the bluish-black moth shown on Plate 120, Figs. 1, 2, is the brownish centred white reniform { 240} stigma. Except that the yellowish submarginal line is sometimes obscured, the species is very constant in the British Isles. Abroad, a form without the white mark is known as _unicolor_, Staud., and one or two examples have been recorded as occurring in England, two in 1895 said to have been reared by a northern collector from caterpillars obtained in the London district. The caterpillar figured on Plate 129, Fig. 2, was pale green with darker green markings. In another form the colour is pale brown with the markings darker brown. It is found from August to October on all sorts of low plants, and in the garden, where it is often common in the suburbs of London, is very fond of the foliage of _Anemone japonica_ and lupin, among other plants. The moth is out in July and August, but is not often common north of the Midlands, though it occurs, or has been found in almost all the counties of England. Its occurrence in Scotland seems to be doubtful, and Kane states that it is rare in Ireland, and almost absent from the northern counties. Its range abroad extends to China and Japan.