The moth, which inhabits woods, and is out in late May and in June, is sometimes attracted to sugar, but rather more frequently to light. It is, however, far more rarely seen than the caterpillar, which has been obtained in almost every English county up to Yorkshire. A specimen of the moth has been recorded from Darlington, Durham, and one at Meldon Park, Northumberland. It occurs in Wales and Ireland, but is hardly known to be found in Scotland.
The range abroad extends to Amurland and Japan.
The Brimstone (Opisthograptis luteolata).
This generally distributed and often common yellow species (Plate [117], Figs. 4 and 5) has the front margin of the fore wings marked with reddish, and occasionally a stripe of this colour extends along the front margin from the base to the tip; the discal mark is whitish outlined in reddish brown; the wavy cross lines are often faint, and not infrequently quite absent. White specimens, ab. lacticolor, Harrison, have been recorded from Cheshire and Durham, and probably have occurred elsewhere, since I have a specimen said to have been taken in Staffordshire; an orange-yellow form has occurred in the last-named county. (Also known as Rumia cratægata.)
The twig-like caterpillar is brownish tinged with greenish or purplish; there is a double-pointed hump on the back of ring 6 and smaller projections on 8. It feeds on hawthorn chiefly, but sometimes on sloe, plum, etc. It may be found after hibernation in the spring, and a second generation occurs in the summer.
The moth seems to have been noted in each month from April to August, but it is most frequent in May and June.
Bordered Beauty (Epione apiciaria).
The orange-yellow moth whose portrait is shown on Plate [119] (Fig. 1) has the outer margins, beyond the second blackish line, more or less shaded with purplish grey, inclining to purple near the line; on the fore wings, the first cross line is angled at the middle, and the second line runs to the tips of the wings. Gynandrous specimens of this and also the following species have been noted.
The early stages are figured on Plate [121], Figs. 2, 2a. The eggs, which are laid in July and August on the food plant, are pale yellow at first, then reddish, with white dots and patches. The caterpillars generally emerge in the following spring, but sometimes, at least in captivity, they hatch in about a fortnight, feed up quickly, and attain the moth state in September or October.