. Agricultural zoology. Zoology. INSECTS. 151 The Silver Y Moth (Plusia gamnna). Moth: About | of an inch long; span of wings 1^ inches. Dark grey, mixed with a reddish tint, and darkly marbled. About the middle of the fore wing there is a very obvious gamma (y), or Y-shaped mark. Hind wings bright brown at the root, darker at the margins, with a whitish fringe. A crest of hairs on the dorsal side of the thorax. Caterpillar: 12-legged. It bends its body like a looper (Fig. 102). Length 1 to 1^ inches. Ground colour green; but there may be variations in this from a dirty green to a brownish. Fi
. Agricultural zoology. Zoology. INSECTS. 151 The Silver Y Moth (Plusia gamnna). Moth: About | of an inch long; span of wings 1^ inches. Dark grey, mixed with a reddish tint, and darkly marbled. About the middle of the fore wing there is a very obvious gamma (y), or Y-shaped mark. Hind wings bright brown at the root, darker at the margins, with a whitish fringe. A crest of hairs on the dorsal side of the thorax. Caterpillar: 12-legged. It bends its body like a looper (Fig. 102). Length 1 to 1^ inches. Ground colour green; but there may be variations in this from a dirty green to a brownish. Fig. 102.—The Silver Y Moth (^Plusia gamma), with caterpillar and pupa. colour. Six fine longitudinal lines on the back, and a yellowish line above the legs. The caterpillar is almost naked, only possessing a few small, isolated bristle-like hairs. Habits: At least two generation^, and sometimes as many as five in two years. The Silver Y Moth generally hybernates as a half-grown caterpillar, but sometimes also in the pupa, or moth state. The caterpillars may therefore be met with the whole year; but they are usually most abundant from the end of June to the middle of August, and, under favourable conditions, may become an agricul- tural pest. They devour the leaves of almost all wild and cultivated plants (except grasses, corn, and trees), and are especially fond of leguminous plants (peas, vetches, clover), flax, beet, rape, cabbage, and buck- wheat. The moths mostly appear in May, but also in July, and later on in the summer, especially on. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bos, Jan Ritzema, 1850-1928; Ainsworth Davis, J. R. (James Richard), 1861-1934. London, Chapman & Hall, Ld.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
