A portrait of this species, which, as a British insect, was first noted in Suffolk nearly sixty years ago, will be found on Plate 95, Fig. 1. The fore wings are pale brownish, except on the front edge, which is greyish; the black discal spot is distinct and rather long; the median vein and its branches are dotted with black, and most of the cross lines are only distinct on the front margin, where they are blackish; the rather wavy whitish submarginal line is sometimes marked with blackish. In some specimens the costal half of the fore wings is greyish, and the other portion only tinged with pale brownish. The long caterpillar is green, with three purplish lines along the back, the central one wider and more distinct than the others; the head is purple. Sometimes purple, with two lines of a deeper shade on each side of the back (Crewe). It feeds, in the autumn, on flowers of burnet-saxifrage (_Pimpinella_). {229} The moth is out in June and July, and in the late afternoon is occasionally put up from among its food plant or the herbage around, but such specimens are rarely worth keeping, unless of the female sex, when eggs may be obtained. The species has a wide distribution in England, especially in the southern half; it occurs in Wales, and also in Ireland, but not in Scotland. THYME PUG (_Eupithecia distinctaria_). This delicately marked species, better known, perhaps, as _constrictata_, Guenee (Plate 95, Fig. 4), has the fore wings whitish grey, with three slender blackish curved cross lines, and some less distinct greyish ones; the outer margin is slightly darker, and traversed by a wavy whitish line; discal spot black and conspicuous. I have not seen specimens from the Hebrides, but, according to Barrett, these have a more decided grey tint. The rather long, wrinkled caterpillar is dark green, inclining to yellowish between the rings, with a broad purplish red line along the back. It feeds on the flowers of wild thyme (_Thymus serpyllum_), in August and September. The moth is out in June and July, and inhabits dry places where there is an abundant growth of wild thyme. It is easily alarmed, and quickly rises on the wing from its hiding-place among the herbage. The species is, or has been, found in most of the southern counties of England, from Sussex to Cornwall, on the western side from Somerset to Westmorland, including North Wales and the Isle of Man; also recorded from Buckinghamshire, Yorkshire (Richmond), and Northumberland. In Scotland it occurs chiefly on the west to Ross, and in the Hebrides; in Ireland it is widely spread, but most frequently met with on the coast. {230} BLEACHED PUG (_Eupithecia expallidata_). The ample wings light brown in colour, with large black discal spot, and smaller black marks on the front edge of the fore wings, distinguish this species (Plate 95, Fig. 7) from its closest British allies.