The older writers on British moths called this the "Unicorn" or "Bindweed Hawk." The fore wings are whitish grey, mottled with darker tints, and, in the male, clouded with blackish about the middle of the wing; the central third is limited inwardly by a double blackish, wavy line, and outwardly by an irregular, toothed, whitish line; running from one to the other are two black streaks between the veins, and a similar streak nearer the costa is waved upwards to the tip of the wing. The hind wings are whitish grey, with a black stripe near the base, and two blackish bands between the stripe and the outer margin. The thorax agrees in colour with the fore wings; the tapered body has a broad grey stripe, enclosing a central black line along the back, broad red and black and narrow white bands on each side (Plate 10). The egg has been described as bright green in colour, and smaller than that of the Privet Hawk. A female moth captured at Brighton on July 18, 1898, deposited twenty-five eggs on _Convolvulus arvensis_ up to July 20, and the next day a further eight were counted. The moth died on the 22nd. Caterpillars hatched out July 27-28. These were whitish green, with a rough blackish horn; after second moult they became green, with a darker green stripe along the back, but without oblique side stripes. [Illustration] Pl. 10. CONVOLVULUS HAWK-MOTH. [Illustration] Pl. 11. 1. CHRYSALIS OF DEATH'S-HEAD HAWK-MOTH. 2. " " CONVOLVULUS " " 3, 3a. CATERPILLAR AND CHRYSALIS OF PINE HAWK. {29} In its more usual form the caterpillar, when full grown, is bright apple-green, narrowly streaked with black; oblique stripes on the sides yellowish; horn reddish, tip black. Head green, with black stripes. In some examples the side stripes are edged above with bluish black; in others there are blackish, more or less square, spots on the back, and patches on the sides. Sometimes the general colour is blackish brown, with ochreous bands and streaks. (This form is figured on Plate 9). When it occurs in these islands it is generally found on the small bindweed (_Convolvulus arvensis_), but it will eat _C. sepium_ and _C. soldanella_, and also the cultivated kinds. Referring to the caterpillar in Britain, Moses Harris, in 1775, wrote, "I never heard of but two that were ever found--one by Mr. South [or Smith] of Hampshire, which, he said, was green, and appeared in other respects so like the privet that he was deceived. He fed it on the leaves of the lesser bindweed. It changed into the chrysalis in the earth, in July, and the moth was produced in September" (Dale).