. Elementary entomology . Fig. 166. Dog-day harvest-fly {Cicada iibicen), female (After Lugger) 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
. Elementary entomology . Fig. 166. Dog-day harvest-fly {Cicada iibicen), female (After Lugger) 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
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
