File:Image from page 053 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598313768).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: worker eggs. The workers, when grown, FIG. re.—Poiistcs.enlarge the nest and care for the numerous Slightly reduced. , ,, n Photo, by W. H. progeny ot the queen. Our social wasps c. P.belong either to the p-enus Polistes,2 which o o includes the ordinary black, brown, or yellow bodied wasps, which build mushroom-shaped nests behind window blinds and under boards (Fig. 32), or to the genus Vespa, 1 From vespa, wasp. 2 TroXto-r^s, founder of a city. D 34 ZOOLOGY

Text Appearing After Image: Xat. size.H. C. P. which includes the black and spotted hornets and yellow-jackets, that build great masses of paper combs enclosed in a nearly spherical gray paperenvelope (Fig. 33). These arefound attached to trees or partsof buildings. The paper is madeof finely masticated wood-fibrecemented b}~ a secretion. Certainyellow-jackets form nests in theground. The hornets are well FIG. 33. -Vespa, a hornet, known as among the most vindic-Photo. by w. tive of our northern insects, andtheir sting is capable of produc-ing considerable pain. In all Hymenoptera the pain ofthe sting is due to the introduction of a poison intothe body of the victim through the stinging organ. Thispoison is secreted by a special gland of the insect. The digger and mud wasps (Fossoria1) have the mostvaried habits. One of the most familiar species is Pclo-poeusf which somewhat resembles a truewasp, but may be easily distinguishedfrom it by the long, slender attachmentof the abdomen to the thorax and by thefact tha

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