. Agricultural zoology. Zoology. 112 ZOOLOGY. Germany on board ship, but in almost all cases the pests so introduced have been recognized and caught. Twice during 1877 they were able to increase (Mulheim, SchUdau), and the same thing has hap- pened once at a more recent date. (Torgau); but the vigorous action of the authorities quickly exterminated the beetles. Beetle (Fig. 81), half an inch long, dusky yellow, with five longitudinal black streaks on each wing- cover, and black markings on the neck-shield. Larva (Fig. 82), half an inch long, thick, lieshy; legs short. Fro. 82.—Colorado Beetles
. Agricultural zoology. Zoology. 112 ZOOLOGY. Germany on board ship, but in almost all cases the pests so introduced have been recognized and caught. Twice during 1877 they were able to increase (Mulheim, SchUdau), and the same thing has hap- pened once at a more recent date. (Torgau); but the vigorous action of the authorities quickly exterminated the beetles. Beetle (Fig. 81), half an inch long, dusky yellow, with five longitudinal black streaks on each wing- cover, and black markings on the neck-shield. Larva (Fig. 82), half an inch long, thick, lieshy; legs short. Fro. 82.—Colorado Beetles: o, eggs; 6, e, d, younger and older larvae; «, pupse seen from the ventral side and from the dorsal side. and weak. Orange-yellow, with shining black head, and with black spots on the body segments. The younger larvae are darker, almost blood red. When the young potato plants come up, the beetles which have survived the winter creep out of the soil and devour the margins of the young leaves. The female lays her yellow eggs (700 to 1200 ?) in heaps on the leaves (Fig. 82, a). After a week the larvae appear, and carry on the work of the beetles. They attain their full development in seventeen to twenty days, become pupae in the soil, and the beetles of the second generation make their appearance in the middle of June. Still a third generation may appear the same. 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
