The typical form of this species is depicted on Plate 108, Figs. 4 [male], 5 [female], and Fig. 3 on the same plate represents ab. _prasinaria_, Hubner, a form not uncommon in Germany (whence came the example figured), Switzerland, and other parts of the continent, but which is very rare in Britain, and has been recorded from Kent and Suffolk. Sometimes, but chiefly in Scotland, the colour varies to a greyish or even yellowish tint; the cross lines are often parallel or nearly so, and frequently approach each other about the middle; the usual white edging to the cross lines is occasionally absent, and the enclosed space in such specimens is hardly darker than the general colour. On Plate 106, Fig. 1, will be found a figure of the caterpillar, which is tawny brown with white-edged, connected reddish marks along the back. It feeds, from September to May, on Scots pine (_Pinus sylvestris_), and occasionally on larch. The moth is out in June and July, and sometimes in September. It may be jarred from the pine boughs, and is not infrequently seen resting on foliage of the undergrowth. Generally distributed in fir-woods throughout Great Britain, and widely spread in Ireland. The range abroad extends to East Siberia. {270} THE LIGHT EMERALD (_Metrocampa_ (_Eudalimia_) _margaritaria_). When quite fresh, this species (Plate 108, Fig. 6) is of a delicate whitish-green colour, but the green tint is apt to fade or to change colour, so that the wings are almost ochreous white sometimes. The eggs shown on Plate 106, Fig. 3, were kindly supplied by Mr. Norman Riley. The caterpillar ranges in colour from greenish brown to purplish brown, and is frequently freckled with a darker shade of the general colour; there is sometimes a pale patch on rings 6 and 7, and the sides are fringed with fine bristles along the spiracle area. It feeds, from September to May, on the leaves of oak, birch, beech, elm, etc., and during the winter will nibble the bark of the younger twigs, and also eat the buds. The moth, which is partial to the woodlands, is out in June and July, and is pretty generally distributed over the British Isles, except the Hebrides, Orkneys, and Shetlands. LARGE THORN (_Ennomos autumnaria_).