teaches them to dig fresh holes lower down, for their security.

The most familiar species is the conimoii

May-fly, so plentiful in the early part of sum• mer, in the vicinity of rivulets and stagnant waters. it is of a greenish brown colour, with transparent wings, elegantly mottled with brown, and has three very long, black bristles, at the extremity of the body. The larva is of a lengthened shape, beset on each side of the body with finny plumes, and, at the tail, with three long, feathered processes. When arrived at its, full size, the rudiments of wings, resembling a pair of oblong sheaths, or scales, are visible on the back. It is a fa

ourite thod of several kinds of fishes, particu lady the trout. Some soasons ac so favourm able to its increase, that the air, in the immc diate neighbourhood of its natal waters, is frequently blackened by its numbers, during the evening hours : and we are told, that iii some parts of the duchy of Carniola, a district in Germany, they are used as a manure.

The third genus is called F/rrjgaia. The insects of which it consists have so near a resemblance to some of the moth tribe, that they may easily be mistaken for them: the differ euce, however, is markeel by their palpi, r

feelers, the steneta o the top of the head,

and