File:Image from page 024 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14804797883).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. 1.—Gryllus, — , , cricket. Nat. size. Photo, by W. H. in which T stands for temperature, and N the number of chirps per minute. The mechanism by which the chirp is produced is as follows : Near the mid-dle of each of the upper wings ofthe male cricket is a vein so modi-fied as to form a sort of file, andnear the margin of the wing is athickened scraper. When the up-per wings are brought in contactabove the body, and the scraper ofone is rubbed across the file of theother, the wings are set in vibration,producing the call. An aberrant form of Gryllidee isthe mole cricket (Fig. 2), whose FIG. 2.--Grii!iuta?pa bore- f°re feet have become much modi- alis, mole cricket. Nat. ne(j f()r burrowing,size. Photo, by W. H. C p 1 he Locustidae,1 or long-horned

Text Appearing After Image: 1 From the Latin name for the locust and grasshopper, as well as thelobster. 6 ZOOLOGY grasshoppers and katydids, are close allies of the short-horned grasshoppers already defined. Next to the numer-


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Source Image from page 24 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900)
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