. Elementary principles of agriculture; a text book for the common schools. Fig. 99. Squash bug. A, eggs on leaf; 6, egg-shell; c, d, e, f, nymphs; g, Chittenden. Bureau of Entomology, U. S. Department of Agriculture. ants do not eat the leaves, but carry them into theirunderground nests and use them as a medium or soilon which to grow a fungus which they do eat. Theseants are real ^farmer insects, in that the food they eatis grown by their own efforts. Carbon bisulfide, pouredinto their nest, may sometimes destroy the colon3^(c) By Sucking the Juices. We may distinguish 162 Elemen
. Elementary principles of agriculture; a text book for the common schools. Fig. 99. Squash bug. A, eggs on leaf; 6, egg-shell; c, d, e, f, nymphs; g, Chittenden. Bureau of Entomology, U. S. Department of Agriculture. ants do not eat the leaves, but carry them into theirunderground nests and use them as a medium or soilon which to grow a fungus which they do eat. Theseants are real ^farmer insects, in that the food they eatis grown by their own efforts. Carbon bisulfide, pouredinto their nest, may sometimes destroy the colon3^(c) By Sucking the Juices. We may distinguish 162 Elementary Principles of Agriculture other groups of insects by the way they get their foodfrom the plant or animal. Instead of having jaws withwhich they may bite off and chew their food, theirmouth parts are shaped into a kind of tube which theyuse to suck blood or sap, nectar or viscid matter. Thesquash-bug (Fig. 99) and the chinch-bug get their foodby sucking. Plant lice, such as the green bug, and SanJose scale (Fig. 100) are also sucking Fig. lOU. San Jose scale on plum. A, natural size; 6, magnified;c, greatly magnified. Insects should not be classed as biting insects andsucking insects because some species have bitingmouth parts at one stage of their Ufe cycle and suckingmouth parts at another. The caterpillars gnaw or bitetheir food, while the parent moths or butterflies have asucking tongue. Some kinds with sucking mouth partsare comparatively free, their host and habitat beingoften unknown. Many kinds, however, have developedfixed parasitic habits. Most of the bloodthirsty pestsbelong here, such as horse and cattle flies, the mosquitosand the common bed-bug. The sucking insects are usu-ally external feeders. Exceptions are noted in the caseof the horse bot and the cattle warble. 230a. Structure of Insects. For this exercise the pupil shouldsecure good specimens of the grasshopper and butterfly, as these Insects on the Farm 163 two insects illustrate the di(Terenc
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