:Atop of corrosive fluid, lays its egg, and dies. The circulation of the nutritive juices being interrupted by the infusion of this poison, the adjacent parts are corroded, and the natural colour of the plant altered; the gall-nut is thus produced by the sap or juice, which, from this circumstance, is turned out of its usual course.

The second genus, Tentizredo, or Saw-fly, is SO named from the formation of its sting, which differs--from that of all other insects, those of the following genus only excepted.

The species of the Tenthridines are very numerous, and differ from one another in colour and size. Some, by means of their saw, deposit in the buds of flowers, others on the twigs of trees or shrubs, eggs, which produce larvae, called false caterpillars, that bear a great. resemblance to those of the order Lepidoptera, or real caterpillars; from which, however., you may readily distinguish them, by the number of feet being generally from eighteen to twenty-two; whilst those of the true kind never exceed sixteen, and are seldom so numerous. They feed on the leaves of plants, particularly the rose and the willow, and undergo their chrysalis state in a strong, gummy envelopment, prepared with silken threads in

autumn,