File:Image from page 033 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14804802143).jpg

Identifier: introductiontozo00dave Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools; Year: 1900 (1900s) Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan company London, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library

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Text Appearing Before Image: o- of yoiuii>; seen as swellings on thethirds nat. size. Photo, by W. H. C. P. bark. Nat. size. Photo, by V.H.L, 14 ZOOLOGY The Homoptera include insects of very diverse size andform. The largest are the cicadas, or locusts (Fig. 14),some of which have the remarkable habit of requiringthirteen or seventeen years for their development. Con-sequently these cicadasappear only at intervalsof thirteen or seventeenyears. The young burythemselves in theground and live bysucking juices from theroots of trees. Eventu-ally they come to thesurface, leave their lar-val skin (Fig. 15), andFIG. 17. —Schizoneura, a woolly aphis, on flvqwav iq full o-rnwnapple twig. Photo, by V. H. L. cicadas. In the case of our common species of cicada there is a brood every year.Besides the cicadas the Homoptera include the littleleaf-hoppers and tree-hoppers, the very destructive scale-bugs (Fig. 16), and the mealy-bugs, most of which attackfruit trees and their fruits, and the plant-lice, or aphids(Fig. IT).

Text Appearing After Image: APPENDIX TO CHAPTER I KEY TO THE PRINCIPAL FAMILIES OF THE ORTHOPTEKA a\. Legs similar, fitted for running ....«2- First pair of legs differentiated for grasping; pro- thorax elongated Blattidce(Cockroaches) Mantidce(Praying-mantis) APPENDIX TO CHAPTER I 15 «3. Legs similar, much elongated, and fitted for slow walking . Phasmidce (Walking-sticks)«4. Hinder legs stouter or longer than middle pair. 61. Antennae shorter than body .... Acrididce (Locusts and Short-horned Grasshoppers) 62. Antennae longer than body. Ci. Tarsi 4-jointed Locustidce (Katydids and Long-horned Grasshoppers) c2. Tarsi 3-jointed Gryllidai (Crickets) CHAPTER II THE BUTTERFLY AND ITS ALLIES Systematic Position. — Butterflies belong to the insectorder Lepidoptera,1 characterized by the possession of along, coiled, sucking proboscis; large, membranous wings,covered with colored scales; and a complete metamorphosis.They occur over the whole globe, but become more numer-ous in species in the tropics of South Ameri

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