In order that the Junior Naturalist may recognize these visitors I will describe their methods of arrival. Sometime in the latter part of May or in early June you may hear a great buzzing in some trees, as if there were a thousand lilliputian buzz saws going at once. If you examine the trees you will find on them many queer-looking insects, with black bodies about an inch long, covered with transparent wings folded like a roof. Naturally you will wonder how such great numbers of large insects could appear one day when they were nowhere to be seen the day before. But if you look at the ground beneath the trees you will find in it many small holes. You will also find clinging to the trees many whitish objects, which at first sight seem like pale, wingless insects, but which on closer examination prove to be merely the cast skins of insects (Fig. 339). These are the cowls and robes which our little American hermits cast off after they come out of their underground cells, and which they must shed before they can free their wings. Our little American hermits we call the seventeen-year locusts. However, this name is a most confusing one, since we also call our grasshoppers locusts, and to them the name truly belongs. These seventeen-year locusts are really cicadas, and they belong to a different order from the locusts. The real locusts have mouth-parts formed for biting, while the cicadas have mouth-parts grown together in the form of a tube, through which they suck juices of plants. So we hope the Junior Naturalists will call our little hermits by their right name, cicadas; and will not permit them to be spoken of as locusts. In order that you may know the mysterious lives of these wonderful insects, I will tell you the story of one of them. THE STORY OF LITTLE HERMIT BROTHER, CICADA SEPTENDECIM.