. Bulletin. Natural history; Natural history. 14 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 area of overlap coincides very closely with the Corn Belt. Another type of range in this class is illustrated by Hydropsyche aerata, which appears to have a very re- stricted range, fig. 15. Among the Hydrop- tilidae are several species which, on the basis of present records, appear to be re- stricted to the Corn Belt and its immediate vicinity; these include Hydroptila angusta, grandiosa and ajax and Neotrichia falca. Ranges Projecting Into Illinois Northern-Northeastern Species. — Of the
. Bulletin. Natural history; Natural history. 14 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 area of overlap coincides very closely with the Corn Belt. Another type of range in this class is illustrated by Hydropsyche aerata, which appears to have a very re- stricted range, fig. 15. Among the Hydrop- tilidae are several species which, on the basis of present records, appear to be re- stricted to the Corn Belt and its immediate vicinity; these include Hydroptila angusta, grandiosa and ajax and Neotrichia falca. Ranges Projecting Into Illinois Northern-Northeastern Species. — Of the caddis flies having a range that just touches Illinois, or nearly touches this state, the most numerous are northern and north- eastern species. Examples include repre- sentatives of many families: Hydropsyche slossonae and recurvata, fig. 16, Chimarra aterrima, fig. 17, Oecetis osteni, Limnephilus moestus, rhombicus and argenteus, and many others. These include both lake and stream species. Each of these species has a slightly different range, some extending south just into Illinois, others deeper into the state and still others not reaching it at all. A number of these species, such as Alystacides longicornis and Neureclipsis bimaculatus, are Holarctic and many more will undoubt- edly prove to range extensively northwest- ward through the northern coniferous for- est. This group, as would be expected, em- braces a large number of species which have been found in Illinois in isolated and local colonies and an additional number which have been taken in southern Wisconsin and Michigan but not yet in Illinois. Northeastern-Ozark Species.—One of the most surprising discoveries in this in- vestigation was the unexpected number of species common to both the northeastern states and the Ozark series of mountains, including various areas in Oklahoma and, to some extent, the "cross-timbers" which extend diagonally across Texas. Most of the species exhibiting this type of
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