Locust, or Gryllus Locusta, L. a family of insects, natives of Asia and Africa, where chiefly two species are remarkable, name-ly:

1. The Shielded Locust, so called from the pectinal shield covering its breast. It is marked with a greenish hue, but a deeper yellow beneath its body, and the inside of the hind legs is red : it attains the size of a robust man's finger, and is eaten in the East; an instance of which occurs in Scripture, where it is recorded that St. John used this insect as his food.

2. The Migrating Locust, which is of a smaller size, has a greyish-blue head, yellowish and brown spotted wings above, green ones below, and a reddish belly behind. Its peculiar native soil is Great Tar-tary, whence these insects have sometimes migrated into Europe, (flying at the rate of twenty-five English miles in a day), and committed extensive devastations in Corn-fields. They multiply more speedily than any animal in the creation, but are formidable only in the countries where they breed ; being unable to live in cold climates.—In the year 1748, a flight of these depredators was seen in Britain, but they fortunately occasioned no damage. If, however, at any future period, they should again invade this island, it will be advisable to burn, previously to their approach, such combustibles as emit a thick and offensive smoke; for instance, turf, wet straw, etc. sprinkled with sulphur.- An instance occurred many years since, in Germany, where a swarm of locusts was driven from one district to another, by the noise of bells, spades, hammers, and other metallic instruments.