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The caterpillar, which may be beaten from birch, and sometimes alder, in July, is bright apple green with yellowish lines on the sides and back; the ring divisions are yellow, and the head is tinged with that colour. (Adapted from Porritt.) Sometimes the caterpillars are brownish, or greenish grey in general colour. The moth, which is out in May and June, will be found in woods, or on heaths, where birches grow. It rests on the trunks of the trees and may be boxed, as a rule, with ease. On some occasions, however, it is very lively, and the net will have to be brought into action for its capture.
The distribution of this species extends through England, but it is far more plentiful in the south than in the north, although it has been recorded from several places in Yorkshire, and from Coal Law Wood in Northumberland. It is found also in Wales, and in Scotland up to Moray. In Ireland it is not frequent, but has been noted from Mucross, and the Upper Lake of Killarney, in Kerry, and from Tinahely in Wicklow; Kane also gives Clonbrock in Galway, and adds that "some specimens from this locality have the spots very large on a clear whitish ground, so that they have a superficial resemblance to Cleora glabraria."
The range abroad spreads to East Siberia, Amurland, and Japan.
Note.—Staudinger places the last four species in Boarmia, Treitschke; but Prout and others refer them to the genus Ectropis, Hübner. The latter will probably have to be adopted.