File:Image from page 109 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14782630084).jpg

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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: FIG. 87. —Agalena, the commongrass spider. Nat. size. Photo,by W. H. C. P. young are borne on the back ofthe mother. The great size,black color, and hairiness ofsome of these spiders have giventhem an apparently unjustifiedreputation of being very poison-ous. Naturalists who have al-lowed these spiders to bite thehand report that the bite is rarelymore poisonous than that of themosquito. (3) Jumping spiders (Salti-gradse1). - This family includesmany familiar, active species of high intelligence. Some of these of grayish color live inhouses, and are recognizedas members of this familyby their half-running, half-jumping gait (Fig. 90).The cocoon is attached tosome object and enclosedin a sort of tent, in whichthe mother also lives toguard the young. The economic impor-tance of spider webs is con-siderable. First of all,they are of the greatestimportance in capturingmany destructive insects,such as flies, mosquitoes,and moths. Another use 1 saltus, jumping, + yradus.

Text Appearing After Image: o o oo O O o o FIG. 88. —Thomisus, a crab spider. Dia-gram showing arrangement of eyes atbottom of figure. From Emertou. THE SPIDER AND ITS ALLIES 91 to which they have been put is in making silk cloth. Thesilk of the spider is smoother and glossier than that of thesilk-worm, but it is much harder to collect in quantity.A spool is passed against the spinnerets of an individualspider and slowly revolved, winding the silk upon it.The difficulty comes in rearing the spiders, for they areextremely voracious and if the supply of flies is insufficient


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Source Image from page 109 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900)
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