they acquire wings, they are equally exposed to the rapacity of birds.

rlllie next genus is that of JWusca, or Fly, and its. species are so numerous, as to render it necessary to assort it iii dilftaent divisions. The principal of these are distinguished by the :Form of the antcnnm, whicli are either simple, or furnished with a plume. These are again subdivided into such as are more or less downy. The Fly is the most common of all insects, though the habits of the different kinds vary exceedingly, more especially iii the larva states some of which inhabit the earth, others the water. Those of the more common kinds, are generally known by the name of maggots)

and spring from eggs deposited on putrid

substances of different kinds. Several of the aquatic species are curiously formed for their mode of life, and display striking examples that the great Creator has provided for the accommodation and enjoyment of the meanest of his creatures, Some inhabit vegetables, and fed on other Iivin' insects, particularly the aph ides. These larv seem to want eyes, and seek their prey by lengthening their head, r1 he mouth of the perfect Musca, is fbrmed by a soft-, fleshy proboscis, with two lateral lips, and has no palpi.

Tic .Mitrca cameleon is a large, black fly, of