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We have already mentioned the comparative extent of the different orders, from which it appears that the one now under consideration is the fourth in the scale, nearly 25,000 species being supposed to exist. Rather more than 600 different kinds have been found in Britain; but most of these are inconspicuous insects of small size and obscure colouring. The metamorphoses of these insects may be described as merely a series of moultings. The larvæ and pupæ are alike active, the latter distinguishable from the former only by having two small projections on the back which conceal the wings and wing-covers. The only perceptible difference in apterous species in their various stages, is that arising from size. In proceeding to illustrate this order by a selection of a few species from the numerous tribes it contains, we shall first advert to that section which has been named, ,

The distinguishing marks of which it may be of advantage briefly to recapitulate in this place. The