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: or grubs, are taken into the mouth of cattle,and live for a time in the oesophagus. Then they boretheir way through the walls of this tube, and travel onuntil they make their way out through the skin to thesurface. Another injurious species is the sheep bot-fly,whose larvae cause staggers in sheep. The Syrphidae,1 like the bot-flies, mimic honey-bees,bumblebees, and wasps.2 The adults feed on the pollenand nectar of flowers, and even imitate the humming ofthe bee. The larvse of some forms feed upon plant-lice;others, upon decaying vegetable matter. They may occupythe nests of various stinging Hymenoptera. The larveeof some species are known as rat-tailed maggots on account of their having a characteristic append-age. These are sometimes found floatingin foul water or even in salt water. The robber-flies (Asilidse3) are usuallyof large size, have a short head, prominenteyes, legs covered with stiff hairs, andabdomen either long and slender (Fig.65), or stout. These flies attack and de-

Text Appearing After Image: FIG. 65.--Bobber- tj fl>es ^ insects mucll Hy. Nat. size. Photo, by AV. H. larger than themselves, such as bumble- f P bees and dragon-flies. The horse-flies (Tabauiclse4) include the large mourninghorse-fly, Tabanus astratus, which is of a uniform blackcolor, the white-lined Tabanus, T. lineola (Fig. 66), andthe smaller golden-headed horse and ox flies with banded crvp6s or o-ep0os, a small winged insect. - Fig. 04. 3 From asihts, a gadfly. From tabanus, the gadfly of Pliny. THE FLY AND ITS ALLTES 67 wings (Fig. 67). Only the female sucks blood, while themale feeds in flowers. They are powerful and rapid fliers.The larvae are carnivorous and live in the earth or water.

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