File:Image from page 058 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598315498).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: FIG. 38. — Ophion, an Ichneumon which infests caterpillars. Nat. size. Photo. by W. H. C. P. which are closed, in consequence of which the confinedinsect must bore its way out. The galls made by the same

Text Appearing After Image: FIG. ol). — Larvae of saw-tiy on grape leaf. Photo, by V. H. L. 1 Cf. Fig. 69, p. 07. 40 ZOOLOGY species of insect on one kind of tree are quite similar,but if the same insect stings another species of tree, adifferent kind of gall is produced. Also when differentspecies of gall-wasps sting one and the same leaf, the gallswill be unlike. Hence the characteristic form of the gallis determined both by the species of plant and by the species of insect whichlives in it. It is interest-ing to collect galls, watchfor the emerging Avasps,determine their species,and thus get their entirelife history. The gall-wasps are, on the whole,injurious to agriculture. The plant-eating Hy-menoptera are extremelydestructive pests. Theyoung are known asslugs, from their re-semblance to the trueslugs, which are snail-likeanimals. They infest peartrees and rose bushes, leaving scorched, dried leaves behindthem.1 Here also belong the currant-worm and the saw-flies (Figs. 39 and 40;, which eat leaves like c

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