. Essentials of biology presented in problems. Biology. THE INSECTS 243. Cicada: 1, adult with wings spread, showing abdomen (Ab.), head (i/.). thorax (Th.); ;_', pupal case, showing the split down the back ; 3, ventral view, showing beak (B.). eye (£.). produced by a drumlike organ which can be found just behind the last pair of legs. The sound is caused by a rapid vibration of the tightly stretched drumhead. The body is heavy and bulky. The wings, four in number, are relatively small, but the powerful muscles give them very rapid movement. The anterior wings are larger than the posterior. Th
. Essentials of biology presented in problems. Biology. THE INSECTS 243. Cicada: 1, adult with wings spread, showing abdomen (Ab.), head (i/.). thorax (Th.); ;_', pupal case, showing the split down the back ; 3, ventral view, showing beak (B.). eye (£.). produced by a drumlike organ which can be found just behind the last pair of legs. The sound is caused by a rapid vibration of the tightly stretched drumhead. The body is heavy and bulky. The wings, four in number, are relatively small, but the powerful muscles give them very rapid movement. The anterior wings are larger than the posterior. The legs are not large nor strong, the movement when crawling being slug- gish. One of the characteristics of the cicada, and of aU other bugs, is that the mouth parts are prolonged into a beak with which the animal first makes a hole and then sucks up the juices of the plants on which it lives. Life History. — The seventeen-year cicada lays her eggs in twigs of trees, and in doing this causes the death of the twig. The young leave the tree immediately after hatching, burrow under- ground, and pass from thirteen to seventeen years there, depending upon the species of cicada. In the South this period is shortened. They live by sucking the jtiices from roots. During this stage they somewhat resemble the grub of the beetle (June bug) in habits and appearance. When they are about to molt into an adult, they climb aboveground, oUng to the bark of trees, and then crawl out of the sMn as adults. Aphids. — The aphids are among the most in- teresting of the bugs. They are familiar to all. 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 Hunter, George William, 1873-1948. New York, Cincinnati [etc. ] American Book Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1911
