The insects of this order have an imperfect transformation. The eggs hatch at once into young insects, that resemble their parents in form and habits, excepting that they do not get their wings till they approach the adult state. The young consume food voraciously, and the perfect insects are not only still more hungry, but, having increased powers of locomotion, they are more widely destructive. These are the true _Locusts_, and though chiefly injurious to the farm and garden, infesting the meadows and corn-fields, the grasshoppers, when winged, often attack the foliage of our young orchard trees toward the end of summer. But when we contemplate the invasion of the great western plague, belonging to this order, which rivals that terrible scourge, the Locust of the eastern continent, in numbers and voracity, we may well dread their increase and appearance in other parts of the country. The grasshoppers that have invaded Kansas and other Western States are, like all the rest of this group of _Orthoptera_, true Locusts. This order is called _Orthoptera_, from their straight wings; it embraces several groups, cockroaches, crickets, grasshoppers, or locusts, etc., which are all injurious, except the _Mantis_, which is predacious, and therefore useful. =HEMIPTERA.=--BUGS AND HARVEST-FLIES. This order contains many insects that are injurious to the nurseryman, to the orchardist, and to the gardener. They are characterized by having a proboscis instead of a mouth with jaws; they can suck, but they cannot bite. The proboscis is often horny, and armed with two pair of bristles, when it becomes a more formidable weapon for attack. Bugs have four wings; they do not pass through the usual metamorphoses of insect life; but are born with legs and feeding apparatus like the perfect insects, except that some have no wings. Bugs are all injurious to man, excepting such as are predacious, which are serviceable by destroying other insects. Many are very small; and yet their countless numbers and wonderful fecundity enable them to do immense damage, as is true of the _Aphides_ and _Coccidæ_, the _Tingis_, the _Tettigonia vitis_, called the Thrips by our vine-dressers; and still more so of the Chinch-bug of the Western prairies, which destroys whole crops of our most important cereals. The colored juice of some bugs is used in the arts. The coccus of the prickly pear, in Central America, is gathered and dried to form the cochineal of the shops.