. The Dunesland heritage of Illinois. Sand dunes -- Illinois; Natural history -- Illinois. 24 Illinois Natural History Survey Circular 49 larval cases or in specially constructed cocoons in the water. When mature, the pupae escape, swim to the surface, and crawl up on plant stems; the adults emerge from the pupal skins. These insects abound in the waters of the Dead River, fig. 15; three species of them have been found in no other area in Illinois. SPREAD OF TEMPERATE DECIDUOUS LIFE Although the Dunesland life contains many northern species, the great bulk of it comprises species typical of th
. The Dunesland heritage of Illinois. Sand dunes -- Illinois; Natural history -- Illinois. 24 Illinois Natural History Survey Circular 49 larval cases or in specially constructed cocoons in the water. When mature, the pupae escape, swim to the surface, and crawl up on plant stems; the adults emerge from the pupal skins. These insects abound in the waters of the Dead River, fig. 15; three species of them have been found in no other area in Illinois. SPREAD OF TEMPERATE DECIDUOUS LIFE Although the Dunesland life contains many northern species, the great bulk of it comprises species typical of the temperate deciduous forests. These species include several kinds of willows, grasses, sedges, the black oak, and many other plants. To this list belong also a large number of spiders, insects, and other animals, fig. 16. All these forms of life spread into the Dunesland from areas to the south; they probably arrived by a variety of routes and at different times. Some of the species may have spread into the Dunesland from. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ross, Herbert Holdsworth, 1908-. Urbana
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