File:Image from page 045 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14784953195).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. 21. — Larva of Citheronia regalis. Head to left. One-half nat. size. Photo, by W. H. C. P. about six hundred metres make good silk. This longthread has to be unravelled. The outer end is loosened 26 ZOOLOGY by soaking the cocoon in hot water; then several of theseends are brought together and united to form a single fibre of raw silk. Another imported silk-mothcommon in parts of the United States is theCynthia1 moth, whose larva infests Ailan-thus trees. True American forms are thebrown Polyphemus2 moth, whose larva iscolored light green, with oblique yellowstripes; the Promethea3 moth, whose cocoonis formed in a folded leaf which is securelyfastened by silk threads to its twig; the

Text Appearing After Image: Nat. size. Pho-to, by V. H. L. FIG. 25. --Adultfemale of Cll-siocampa clis- stria. From life. Cecropia moth, expanding sixinches, whose coarse tegumen-tary cocoon is bound alongits whole length to a twig; and the nearlyequally large Regal moth (^Citheronia regalls,Fig. 23), whose larva is oar largest cater- male of ciisio-pillar (Fig. 24). All of these species areeasily reared from the larvae or cocoons. Closely allied to the Bombycidre are theTent-caterpillars, which arc never of great size. These are

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