. First lessons in zoology. Zoology. loo FIRST LESSONS IN ZOOLOGY with a string- fastened to the middle of the bottom. There are other species of cicadas besides the seventeen-year-old kind, with shorter hves, a common one being the farnihar harvest-fly or dog-day locust, which requires only two. Fig, 137.—Tite scventet'ii-vciLr cic^nhi, L'u^uid sc/'/iinh'i-iin; the specimen at left showiiiL,^ sound-making <.'rgan; v,p, ventral plate; t^ t\'mpaniim. (From specimens.) years for its development. This is large, and black and green in color, while the seventeen-year cicada is smaller, and black
. First lessons in zoology. Zoology. loo FIRST LESSONS IN ZOOLOGY with a string- fastened to the middle of the bottom. There are other species of cicadas besides the seventeen-year-old kind, with shorter hves, a common one being the farnihar harvest-fly or dog-day locust, which requires only two. Fig, 137.—Tite scventet'ii-vciLr cic^nhi, L'u^uid sc/'/iinh'i-iin; the specimen at left showiiiL,^ sound-making <.'rgan; v,p, ventral plate; t^ t\'mpaniim. (From specimens.) years for its development. This is large, and black and green in color, while the seventeen-year cicada is smaller, and black and reddish-brown. Other insects conspicuous for the sounds they make are the katydids and crickets. The loud sounds of insects are not made by a "voice " that is, by vocal cords set into vibration by the breath. In the katydids and crickets the familiar shrill sounds are made by rubbing together the bases of the front A\'ings, which are specially modified for this purpose. The veins are thickened and rough- ened by little transverse ridges forming a sort of scraper or rasp, so that the membranes are set into strong vibration when the base of one wing is scraped or rubbed over the base of the other. Only the males are provided with these musical organs. There are about a dozen species of tree and bush katy-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kellogg, Vernon L. (Vernon Lyman), 1867-1937. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1903
