. Elementary entomology. Insects. 122 ELEMENTARY ENTOMOLOGY of these vermin is shown in Fig. 165. Similar species infest horses, cattle, and other domestic animals, as well as many wild mammals. SUBORDER HOMOPTERA The cicadas (Cicadidae). The common dog-day harvest-fly (Fig. 166) is the best known example of this interesting family; and although we seldom see it, we are made aware of its presence on a hot summer day by the shrill calls answered back and forth from the tree tops. It is black and green in color, more or less powdered with white beneath. The most remarkable member of. FIG. 1 66.
. Elementary entomology. Insects. 122 ELEMENTARY ENTOMOLOGY of these vermin is shown in Fig. 165. Similar species infest horses, cattle, and other domestic animals, as well as many wild mammals. SUBORDER HOMOPTERA The cicadas (Cicadidae). The common dog-day harvest-fly (Fig. 166) is the best known example of this interesting family; and although we seldom see it, we are made aware of its presence on a hot summer day by the shrill calls answered back and forth from the tree tops. It is black and green in color, more or less powdered with white beneath. The most remarkable member of. FIG. 1 66. Dog-day harvest-fly ( (After Lugger) a tilucen], female the family is the periodical cicada, often improperly called the seventeen-year locust, from its habit of appearing in immense numbers every seventeen years. It is of course entirely unrelated to the true locusts, or grasshoppers. The adults lay their eggs in the twigs of trees, often seriously injuring young fruit trees, as the twigs or stems die beyond the point of the egg puncture. The nymphs drop to the ground upon hatching and, burrowing into the earth, feed upon the roots of trees for sixteen years. The seventeenth year they emerge in immense numbers within a few days, crawl up the trunks of trees, fences, buildings, etc., and trans- form to the adults, which are blackish, with orange markings on the wings. For the next few weeks the air is filled with their shrill cries, and soon many affected trees turn brown as a result of. 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 Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 1882. Boston, New York [etc. ] Ginn and Company
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