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

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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: mostabundant near watercourses, and are sometimes found onthe seashore. Some species emit ill-smelling fluids, often with a popping sound. Thesefluids serve to defend them fromtheir enemies. Some species arevegetable feeders, for instanceone species whose larv?e aredestructive in the South toyoung Indian corn. The next two families, Dytis-cidae2 and Gyrinidae,3 includebeetles which are quite as de-structive to animal life of thewater as the runners are to thoseof the land. The Dytiscidse areoften large species, which have long, thread-like antenme.The Gyrinidce have short antennse and whirl around onthe surface of the water, often in groups. Each eye isdivided into an upper half, used for looking into the air,and a lower half, used for looking into the water. Thelarvre of both of these families have a long and spindle-shaped or flattened body and live in the water. 1 Fig. 43. 2 dvT-r)s, diver ; Sun/cos, fitted for diving. 3 From 70/30S, circle ; because this beetle swims in a circle. Text Appearing After Image: FIG. 4-i. — Calosoma scrutator, thesearcher, a ground-beetle. Nat.size. Photo, by AV.H.C.P. THE BEETLE AND ITS ALLIES 47 Another family of aquatic beetles includes Hydrophilusland its allies, which are less strictly carnivorous than thelast two families. Their antennae areshort and club-shaped, and their bodiesare plumper than that of Dytiscus, whichis of about the same size and lives insimilar places. The next family includes certainshort-winged beetles (Staphylinidte2),so called because the elytra cover onlya small part of the abdomen (Fig. 44).These beetles ( rove -beetles) are usu-ally black and of small size. Theyare very common under decaying or-ganic matter, stones, and other objectslying on the ground. They run swiftly. Some speciesmimic ants and wasps. Not only do they resemble these
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