If we admit that the larva has, in the phylogeny of insects, gradually diverged from the imago, and if we recollect that in the ontogeny the larva has always to become the imago (and of course still does so) notwithstanding the increased difficulty of the transformation, we cannot but recognize that a period of helplessness in which the transformation may take place is to be expected. The generalized arrangement of the wing-nervure and the nature of the larva, which is less unlike the adult than in other beetles, distinguish this tribe as primitive, although the perfect insects are, in the more dominant families, distinctly specialized. The perfect insects are for the most part nocturnal and are believed to be carnivorous. The most important work in this direction has been done by Fritz Muller (Filr Darwin), by Herman Muller (Fertilization of Plants by Insects), Grade b. The distinctness of the dragon-flies from other insects included in Linnaeus's Neuroptera was long ago recognized by J. The Cicadidae are for the most part large insects with ample wings; they are distinguished from other Homoptera by the front thighs being thickened and toothed beneath. It flourishes best in small tanks and ponds, in which the water is constantly changing and does not freeze; in such localities, and with a full supply of food, which consists of weeds, crumbs of bread, bran, worms, small crustaceans and insects, it attains to a length of from 6 to 12 in., breeding readily, sometimes at different times of the same year. Wild animals and tame, carnivorous and graminivorous, insects, birds, fishes and man are adapted to each other.". After examining a rock for ants or other insects, she leaned against it, drawing in the clean smell of the forest. Packard, jun., Guide to the Study of Insects, p. 205 (Salem, 1870). This explanation depends upon what is now an experimentally demonstrated fact that insectivorous birds, and probably other animals, have no instinctive knowledge of what insects are edible and what inedible. During the pre-Linnaean period, the beauty of insects - especially the Lepidoptera - had attracted a number of collectors; and these "Aurelians" - regarded as harmless lunatics by most of their friends - were the forerunners of the systematic students of later times.
In the Mesozoic rocks (Trias and Lias) there have been discovered remains of insects intermediate between those ancient forms and our modern cockroaches, the differentiation between forewings and hindwings having begun. In addition to these abnormal cases, the life of certain insects is naturally more prolonged than usual. Many insects have aquatic larvae, some of which take in atmospheric air at intervals, while others breathe dissolved air by means of tracheal gills. The forests literally swarm with insects of all kinds, from cicadae to beautiful butterflies, and from stickand leaf-insects to endless. Wasmann, who has compiled a list of nearly 1 50o species of insects, arachnids and crustaceans, inhabiting ants' nests. The dipterous gall-formers include the gall-midges, or gallgnats (Cecidomyidae), minute slender-bodied insects, with bodies usually covered with long hairs, and the wings folded over the back. The dragon-flies and May-flies are also active throughout their lives and possess external wingrudiments, though the young insects differ rather strikingly from their parents.
The lizard darted out its tongue at the, 30.
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