In the deserts of Egypt is to be met with the great _Eremobia_, and in South America the _Ommexeca_, which walks rather than springs. On the other hand, the _Tetrix_ springs very well. A remarkable feature about them is their thorax, which is prolonged into a point, and covers the whole body. They are small insects of gay and brilliant colours, and generally remain on the leaves of low plants, and escape easily from the hand that tries to catch them. The _Tetrix subulata_, of a brownish colour, is common during spring, in the environs of Paris, in the woods, and in dry and arid fields. The _Pneumoræ_ are very strange insects. The males have a very prominent abdomen, which resembles a bladder filled with air; and their wings are very much developed. The females have the abdomen of the ordinary shape; their wings are very short, or even quite rudimentary. The former produce a sharp stridulation, by rubbing their hind-legs against a row of small tubercles, which are to be seen on each side of the abdomen. The sound is rendered still more penetrating by the vesiculous or bladder-like abdomen, the skin of which is stretched as tight as a drum. The _Pneumoræ_ inhabit the South of Africa, as also do the _Truxales_, a few varieties of which, however, are to be met with in Spain, Sicily, and the South of France. We will pass in silence over a great number of other less interesting species of Orthoptera. Those which we have described suffice to justify us in what we said above, namely, that this order contains insects of the strangest and most anomalous forms. VI. HYMENOPTERA. The Order Hymenoptera comprises those insects which have four naked membranous wings, lying in repose horizontally upon the body, and intersected by a network of nerves. The name is derived from two Greek words--[Greek: hymên], a membrane, and [Greek: pteron], a wing. The mouth is composed of two horny mandibles, jaws, and lips adapted for suction. It is amongst the Hymenoptera that we meet with the most industrious insects, some of which seem to possess real intelligence. These little animals offer the most admirable examples of sociability. Born architects, they construct dwellings marvellously contrived, which serve them, at the same time, as nurseries in which to rear their progeny, and storehouses in which to lay by their provisions. Nothing can equal the solicitude with which they watch over their young larvæ, still incapable of motion. They form republics, governed by immutable laws, and make war against their enemies in order of battle. They have predilections or antipathies for those who court their society, on account of the material advantages they derive from them.