. Ein Handbuch für die Untersuchung von Insekten. Insekten. ISO DIE UNTERSUCHUNG VON INSEKTEN.. Dog-Tag die Ernte - Fliegen (Abb. 184) Um eine Idee mehr in der Familie geben. Wir haben mehrere Arten viel kleiner als diese; aber ihre charakteristische Form und die Anwesenheit von drei ocelli sind ausreichend, um sie von den Mitgliedern der anderen Familien zu unterscheiden. Die periodische Zikaden, Zikade sep-te 7 tdeciin (Ci-Ca'd ein sep-Ten'de-CIM) ist sehr allgemein in diesem Land bekannt, owince zu Iti des crreat iirh mimbet^^] Es erscheint, in langen Abständen. Dieses periodische Erscheinung ist durch t

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. A manual for the study of insects. Insects. ISO THE STUDY OF INSECTS.. Dog-day Harvest-fly (Fig. 184) to give an idea of the more striking characters of this family. We have several species much smaller than either of these ; but their characteristic form and the presence of three ocelli are sufficient to distinguish them from the members of the other families. The Periodical Cicada, Cicada sep- te7tdeciin (Ci-ca'da sep-ten'de-cim), is very generally known in this country, owince to the crreat mimbet's iti ^^]iirh it appears, at long intervals of time. This periodical appearance is due to the long time required for the nymphs iG. I 4.— ica a u teen. ^^ obtain their growth—either seven- teen or thirteen years—and to the fact that all the members of one generation appear in the adult state at about the same time. The adult female lays her eggs in slits which she makes in the twigs of trees. Small fruit is sometimes in- jured in this way. The eggs hatch in about six weeks. The young nymphs finding no attraction in a world of sun- shine and of flowers, drop to the ground and bury them- selves in the earth, thus commencing a voluntary seclusion which lasts for years. They live by sucking the juices from the roots of trees. In May of the seventeenth year after their retirement to their earthy cloisters they crawl up to the surface of the ground, like renegade monks; and, leav- ing their nymph-skins clinging to the tree-trunks, like cast- off garments of penance, they come forth, broad-headed, broad-bodied, clear-winged creatures, well fitted to get all the experience possible out of a world whose frivolities they have so long scorned. But, like other creatures, they find a hfe of dissipation very exhausting, and after a few weeks they sing their last song, lay their eggs, and pass away. In the South these insects live only thirteen years under. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabili

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• bookcentury1800
• bookdecade1890
• booksubjectinsects
• bookyear1895