. Bulletin. Natural history; Natural history. 136 Illinois Natihal History Sikvev Bvlletix fauna of Illinois an extensive one; namely, the fact that aphids as a group are preeminently at home in temperate climates and that the flora of Illinois upon which they directly depend for sustenance is a large and varied one, comprising components characteristic of the cypress swamjjs of the south, the tamarack swamps of the north, the prairie, the de- ciduous forests, and local biota of diverse composition. It seems clear at the present time in Illinois that the zoogeographi- cal distribution of our j
. Bulletin. Natural history; Natural history. 136 Illinois Natihal History Sikvev Bvlletix fauna of Illinois an extensive one; namely, the fact that aphids as a group are preeminently at home in temperate climates and that the flora of Illinois upon which they directly depend for sustenance is a large and varied one, comprising components characteristic of the cypress swamjjs of the south, the tamarack swamps of the north, the prairie, the de- ciduous forests, and local biota of diverse composition. It seems clear at the present time in Illinois that the zoogeographi- cal distribution of our jilant louse fauna is governed primarilv by the distribution of their plant hosts, all other factors being secondary and. Pig. 10. (Left) Distribution of Eiicrrnphis liffiilnr (Koch) and its host, the canoe birch, Brtiila nlha var. i)<ii)yi-ifcra. Pig. 11. (Right) Distribution of Calaphls brtularcolens (Fitch i and its host, the canoe birch, Brtula alba var. ixipyrifi'ra. Dots in the central portion of the state indicate occurrence on planted trees. often of a fluctuating character. This generalization, obvious to the student of the aphids, is readily illustrated by the majis in our tile show- ing the known distribution in our state of all species of aphids known to occur in Illinois with the distribution of their host plants. .\ few of these ma])s are reproduced here (Figs. lO-K). On each map the dots indicate localities in which the species has been collected and the cross- batching indicates the counties in which its host has been recorded as 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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