Although, as the English name suggests, this insect is greyish, there is always a tinge of ochreous in the composition of its general colour (Plate 97, Fig. 6). Not infrequently the ground colour is decidedly brownish in tint. The markings vary in clearness, but are most distinct in the paler forms. A blackish form occurs in the north of England, and in the Clydesdale district of Scotland, and was formerly known as the "Paisley Pug." The longish caterpillar (Plate 92, Fig. 1) is pale or dusky olive, varying to reddish brown, with a series of darker marks on the back. It feeds, from August to October, on the foliage of almost any plant. The moth is out in May and June, and occasionally a few specimens emerge in the autumn. Generally distributed over the British Isles, but apparently not noted in the Orkneys and Shetlands. Abroad, the range extends to Amurland. PLAIN PUG (_Eupithecia subnotata_). The fore wings of this species are pale ochreous brown, inclining to pale reddish on the outer marginal area; the most distinct markings are a pale cross band beyond the black discal dot, and a pale winding submarginal line. The hind wings are smoky grey, with whitish wavy cross lines, the most distinct being the outer (Plate 97, Fig. 9). The stoutish and somewhat {238} stumpy caterpillar is green, or pale yellowish brown, with three darker lines and marks on the back; a yellowish line low down on the sides. It feeds on flowers and seeds of orache (_Atriplex_), and goosefoot (_Chenopodium_): August and September. Figured on Plate 94, Figs. 1, 1a, from coloured drawings by Mr. A. Sich. In July, the moth may be disturbed from its food plant or adjacent herbage, or it may be seen resting on palings or fences. It flies at night, and will come to light. Not uncommon in many places in the southern half of England, and found in the rest of the country, chiefly on the coast, to Hartlepool in Durham, also in Wales. Once recorded from south Scotland, and only noted from the coast near Dublin, in Ireland. SCARCE PUG (_Eupithecia extensaria_). The conspicuously marked insect represented on Plate 97, Fig. 12, is, so far, only known to occur, in Britain, on the coasts of Norfolk and Yorkshire. It was first discovered in the latter county more than thirty years ago; about twelve years later it was found on the Norfolk coast, and caterpillars were also obtained from the sea wormwood (_Artemisia maritima_) in the autumn. The long caterpillar, which feeds on the flowers and foliage of its food plant, is green, with three lines along the back, the central one dusky and the others whitish; a white stripe low down along the sides is edged below with rosy brown. It will thrive on the cultivated southernwood or "lad's love" (_Artemisia abrotanum_).