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of a flattish shape; its head greatly resembles that of the Oestrus, and the eyes occupy the greatest part of it. The larva of this fly dwells in fresh water, and the perfect insect walk upon the surface. The female places her eggs in the hollow stalks of aquatic plants, so se curely, that they cannot easily be carried away. From this egg proceeds a hrva of a singular structure, that may be often seen crawling on the grass, near shallow, standing waters. The tail has .a verge of hairs, which, when erased ed, supports the insect on the surfhce, wills i1 head downwards. When it is its wish to dc scend, it contracts the hairs into the form of a bell, or sometimes entirely doses them ; if it have occasion to rise again, it forces a bubble from a small opening in the centre of the tail, which immediately has the desired eliect.

In the first division also, is Ibund the Ji'Jusca cermiteo, a middlesjed fly, of rather a lc ngth seed form, and of a dull yellow, wit ii 1ran.. parent wings. It inhabits the southern parts of Europe, and foTins a circular pit to entrap its prey, in a similar manner to that of the ant-lion.

Amongst those flies that arc downy, with bristled antenna, may be remarked the Musea tenax. The larva is a longest aiied, brown mar got, frequently found in muddy, stagnant

waters