Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . Fig. PARASITIC INSECTS. 15 burrow through the earth and devour the insectsfound therein. Parasitic insects differ from their predaceouscousins, in that they develop within the bodies oftheir victims and thus destroy them. These, also,are exceedingly numerous, both in individuals andspecies. A good illustration of the habits of thisclass is found in the small, four-winged, black fly(shown natural size and magnified at the right inFig. 5), that destroys
Insects and insecticidesA practical manual concerning noxious insects and the methods of preventing their injuries . Fig. PARASITIC INSECTS. 15 burrow through the earth and devour the insectsfound therein. Parasitic insects differ from their predaceouscousins, in that they develop within the bodies oftheir victims and thus destroy them. These, also,are exceedingly numerous, both in individuals andspecies. A good illustration of the habits of thisclass is found in the small, four-winged, black fly(shown natural size and magnified at the right inFig. 5), that destroys the common Grape Caterpillar,an insect closely related to the familiar Tomato Wormor Tobacco Worm. This fly deposits a number of eggsbeneath the skin of the caterpillar, and these eggssoon hatch into minute worms or maggots that ab-sorb the body juices of the worm and develop at hisexpense. After a few weeks these maggots becomefull grown, and burrow their way out throughthe skin of their hap- # less and helplesshost. They then,spin their whit e,silken cocoons () upon his back. Fig. 5. Caterpillar with Cocoons of lthlll these
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Keywords: ., bookcentury1800, bookdecade1890, bookidi, booksubjectinsecticides
