These are the straight-winged insects. They have four wings, the front pair being usually leathery and smaller than the hind pair. Here belong the Grasshoppers, Katydids and Crickets. Cockroaches, Walking-sticks, Leaf insects, Praying Mantis also belong to this order. THE COCKROACH. Most of the Cockroaches are nocturnal. It is said that their food is dead animal matter. The kinds of Cockroaches found in the house are the American Cockroach, Croton-bug and the Black Beetle. Apparently they eat anything, animal or vegetable, and are great pests in ill-kept houses, especially where moisture is plentiful. The name "Croton-bug" is applied to the smaller sort, it having made its appearance about the time when Croton water was first used in New York City. They show a strong distaste to light and are fond of warmth. The eggs are laid in capsules. THE LOCUST. This family are insects most destructive to crops. The antennas are short, the hind legs large and strong, giving them their jumping power. The most injurious of these is the migratory locust. During the years 1874 to 1876 this insect, it is said, did more than $200,000,000 damage to crops in four States of the Union. Every country boy knows the crackling sound made by these grasshoppers in their flight. Their "song" is made by the scraping of the legs against their wings. Locusts swarm and are not particular as to the kind of vegetable matter which they eat; anything green which they chance upon is devoured. The red-legged grasshopper is the one most common in the Eastern States in late summer. The true or green grasshoppers have long horns, are much softer in body and "sing" more than their cousins of the locust family. The "Katydids" belong here. CRICKETS. [Illustration: PRAYING MANTIS.] Crickets are closely related to the green grasshoppers. They have long antennae. The Mole Cricket burrows in the earth, as its name implies, digging with its powerful forelegs. The black Field Cricket lives in small burrows in fields and pastures. The Crickets are musical and together with their cousins of this family swell the insect chorus of our summer nights. A peculiar insect belonging to this family is popularly known as the Walking-stick; in motion it does not look unlike a twig moving about. Its body is long and slender. In the tropics this family has many forms which so closely resemble the leaves, and even flowers of plants and trees, as to fool not only the casual but the close observer. Another peculiar insect is the Praying Mantis; this name has been given them because of the position which they take, the legs being held as though in prayer. They are found in the Southern States and are regarded with superstitious awe by the ignorant. THE NEUROPTERA. These are the net-veined winged insects; the Dragon flies, Mayflies, Caddis-flies belong in this order. THE DOBSON.