The caterpillar is green, with three reddish humps on the back, and an interrupted reddish line along the sides. It feeds on poplar in July and August. THE LARGE DARK PROMINENT (_Notodonta tritophus_ = _torva_). Another Central European species, of which only one specimen is known to have occurred in Britain. This was reared from an egg, or from a caterpillar, obtained in Norfolk in the latter part of the summer of 1882. The moth might be mistaken for a small dark coloured specimen of the next species (_N. trepida_), but the dark hindwings readily distinguish it (Plate 31, Fig. 4). The caterpillar, although darker, bears considerable resemblance to that of the Pebble Prominent; it feeds in June and July, and also in September, on aspen. According to Staudinger this species is the _tritophus_ of Esper, an earlier name than _torva_, Hübn.; whilst the preceding species, that has so long been referred to _tritophus_, Fabricius (or _trilophus_), is found to be _phoebe_, Siebert, which name has seventeen years' priority. {74} THE GREAT PROMINENT (_Notodonta trepida_). Fore wings greyish, or ochreous grey, with dark cross lines; a blackish tuft from middle of inner margin, and a series of dark, or sometimes reddish, spots on a pale cross line before the inner margin. Hind wings whitish, sometimes ochreous tinged; clouded with greyish on costal area (Plate 31, Fig. 5). When full grown the caterpillar is rather larger than the one figured on Plate 30. In colour it is green, with yellow lines along the back, seven reddish-edged yellow oblique streaks on the sides, and a reddish tinged stripe on the two rings nearest the head. It is stated to assume a purplish tint when quite mature. May be found from end of June to early August on oak. The dark reddish brown chrysalis, which is enclosed in an earth-covered cocoon, may be found at the roots of oak trees in the autumn or winter. The moth emerges between late April and early June, sometimes remaining in the chrysalis for two winters. Light attracts it freely, and it is frequently seen in the illuminated moth trap, and may be occasionally noted on the iron frame of a gas lamp in suitable places. Sometimes the moth is met with in the daytime, resting on the trunks or branches of oak trees in woods, or on palings adjacent thereto. When such specimens happen to be females, they should be kept for eggs, which they lay freely. It occurs in most of the southern counties of England, is somewhat rare in the Midlands, and scarce in the northern counties and in Scotland. Recorded by Birchall as "not uncommon in Co. Wicklow," but Kane ("Cat. Lep. Ireland") states that he has no information concerning its occurrence in the sister island. Distributed throughout Central Europe, extending into Spain, Italy, and Corsica; also to South-east Russia, Armenia, and possibly Ussuri. {75} THE WHITE PROMINENT (_Leucodonta bicoloria_).