It feeds in June, July, and again in September, on beech. The moth is out in May and June, and again in August and September. Beech woods are its favourite haunts, and it seldom strays far from them. It is generally common in the south, and its range apparently extends to Northumberland; but it is local and infrequent in the north. Three specimens have been recorded from Co. Galway, and one from Co. Cork, in Ireland.
Note.—Nearly fifty years ago, at Brighton, a single specimen was reared from one of eight larvæ that hatched from the same number of eggs deposited by a female E. linearia that had paired with a male E. orbicularia. This hybrid has been named brightoni, Tutt.
The Mocha (Ephyra annulata).
Normally, the wings of this species (Plate [53], Figs. 6, 9) are yellowish white, inclining to ochreous yellow with the blackish central shade near to and sometimes united with the blackish irregular and outwardly toothed second cross line on both fore and hind wings; the rings are deep brown or blackish. There is variation in the width and intensity of the central shade, and the rings sometimes are absent on the fore wings (ab. obsoleta, Riding), and occasionally all the wings are devoid of the annular mark (ab. biobsoleta, Riding). Examples of a second generation reared in captivity are rather deeper coloured, and have a sprinkling of black scales, chiefly on the fore wings.
The caterpillar (Plate [51], Fig. 2, after Hofmann) is dark green, yellow between the rings; there are three yellow lines along the back, the outer ones waved; head reddish brown, paler marked. (Adapted from Porritt.) There is also a pale ochreous brown form.
It feeds on maple in June, and as a second generation in August and September. It may be reared on sycamore. The moth frequents lanes, woods, and thickets, especially those in which maple is plentiful; it flies at dusk, and in the daytime may be beaten from hedgerows in which the food plant grows. It has also been found among hornbeam. The species is most frequent from Kent to Hampshire, but widely distributed over England up to Worcester and Herefordshire, and eastward to Norfolk, occurring also in Northampton and Yorkshire.
The colour and ornamentation of this charming little insect seem to have struck Haworth, who named the species in the vernacular, as bearing some resemblance to the Mocha stone from Arabia, a kind of transparent agate in which are seen brownish moss-like markings.