=Blister-flies, or Beetles.=--There are several species of these insects, each of which appears to have its favorite pasturage. They are exceedingly voracious, but confine themselves chiefly to the destruction of herbaceous vegetation, and are therefore obnoxious to the farmer and gardener, who know them as the potato insects, than to the fruit-grower. Their appetites are not very discriminating, however, and when they are abundant they may consume the foliage of our trees. These Blister-flies belong to the genus _Lytta_, and are used as a substitute for the Spanish-fly of Europe, as they are possessed of blistering qualities in no mean degree. They are wholly different from the new potato destroyer of the West, the _Doryphora 10-lineata_, which is hemispherical, and is a leaf-eater, in the larval as well as in the perfect state. REMEDY.--Catch and kill all that can be found in the garden, or potato field; scald, dry, and sell to the apothecary. Before closing this section, it is but due to our many insect friends in this order, to introduce a few of them to the reader. There are several large families that are really serviceable to man; some of these are called Scavengers, because they consume large quantities of decaying matter that might prove noxious to us, were it allowed to decay upon the surface of the ground. Among these are the Dung-beetles, and the Carrion-beetles: others are carnivorous, and some of these are called _Cicindelidæ_, or Tiger-beetles, from their voracious consumption of other insects, which they devour in great numbers, both in their larval and in their perfect form. These day beetles are large, brightly colored, and very active in their movements, as they run about in the sunny paths and roads, and cannot fail to attract attention. Few persons are aware, however, of the valuable aid they are rendering to man, nor of the credit that is due to them for the preservation of our crops from the invasion of other insect foes. Too often they are either unobserved and overlooked, or even treated with the aversion and cruelty of men who ignorantly attempt to stamp out all insect life, as though these creatures were intruders upon their preemption. The intelligent observer of nature will soon learn to respect each aid, which has been so wisely furnished to assist him in his labors as a cultivator of the soil, and all may admire the Wisdom that has provided at the same time such beautiful and such useful creatures for the work.