_Moth_: About ¼ inch long; span of wings ⅗ inch. Fore wings small, lancet-shaped, with long fringes. Ground colour yellowish brown, darkly speckled. Hind wings brownish grey, small, strongly fringed. When at rest the long fringes form a sharp backward and upwardly directed comb, while the antennæ are applied together and stretched straight forwards. _Caterpillar_: About ¼ inch long, tapering in front and behind. A beautiful green, with a black head. Lives hidden under a very thin web or under a few fibres, on the lower side of the leaves of cabbage, rape, and other crucifers. _Habits_: The pupa lives through the winter; the moths emerge in May, and fly about in the evening. Two generations; the first generation of caterpillars in the first half of July, the second in late summer. The second generation is particularly apt to be destructive to cabbage. Pupæ found on the leaves of the plants attacked, and surrounded by a thick web. SIXTH ORDER: Hemiptera (HALF-WINGED INSECTS). [Illustration: FIG. 107.—Left pair of wings of a Bug. ] The mouth-parts are modified into a sucking and piercing beak. Head small. Legs usually slender, with two- or three-jointed feet. Wings are absent in several species (_e.g._ bed bugs); in one section (_e.g._ fruit bugs) the fore wings are half of leathery, half of membranous texture (Fig. 107); in others, all four wings are membranous (winged plant lice), or the fore wings are somewhat harder than the hind wings (frog-hoppers). Incomplete metamorphosis (p. 89). None of agricultural importance except— Family: =Aphidæ= (_Plant Lice_). [Illustration: FIG. 108.—The Bean Aphis (_Aphis papaveris_); a larva of the same below. ]