The caterpillar is yellowish green, with a red brown stripe along the back; two small elevations on ring four, and one on ring eleven; the hairs are blackish on the back, one of each tuft longer than the others. It feeds on hawthorn in August and early September. The moth is out in July. This species is found abroad in Central Europe and Southern France; also in Amurland, Corea, and Japan. THE DARK DAGGER (_Acronycta tridens_). The English name of this moth is not very suitable, as in general colour it is often really paler than many examples of the next species. Specimens with a blackish cloud at the base, and a dark band-like suffusion on the outer margin of the fore wings are referable to var. _virga_, Tutt. It is widely distributed in England and Wales, but apparently not common; rare in Scotland and in Ireland. I am unable to indicate any character that will serve to distinguish this moth from the Grey Dagger. The moth flies in June; a second brood sometimes occurs in confinement in October. The caterpillars of the two species are very distinct. That of the present species is black, with a broad reddish stripe along the back, and one on each side; the first is interrupted with white, and the others with black; there is a black hump on the fourth ring, and a broader one on the eleventh ring. It feeds from August to October on hawthorn, sloe, plum, pear, and apple; also on birch and sallow. The moth is shown on Plate 100, Fig. 10; and the caterpillar on Plate 101, Fig. 4. THE GREY DAGGER (_Acronycta psi_). The ground colour varies from whitish to blackish grey, Var. _bivirgæ_, Tutt, is similar to var. _virga_ of the last species. {196} In var. _bidens_, Chapman, the first cross line is double, enclosing a pale stripe; the upper part of second cross line is more angled, and the dagger mark at the anal angle is much shortened. The caterpillar has a taller and more slender hump on ring four, and the stripe along the back is clear yellow, with black edged red spots on each side of it. Generally distributed, and often common. The moth is shown on Plate 100, Fig. 11; and the caterpillar and chrysalis on Plate 101, Figs. 5 and 5a. THE LIGHT KNOT GRASS (_Acronycta menyanthidis_). Portraits of this moth will be found on Plate 103, Figs. 1[male], 2[female]. Several modifications have been named, the most important of these are var. _scotica_, Tutt, which is larger and brighter than the type, with the markings clear and distinct; var. _suffusa_, Tutt, is much suffused with black. The former is chiefly found in Scotland, and the latter in Yorkshire.