. Bulletin. Natural history; Natural history. 228 Illinois Nati'ral History Survey Billetin Vol. 29, Art. 4. Fig. 24.—Distribution of Leucothrips pierce i in Illinois. In brief, it appears that the gla- ciated regions were repopulated by species coming from the Ozarkian refugia via the Mississippi-Illinois riv- er valley system, and from the Ap- palachian refugia via the Tennessee, Kentucky, and Wabash river valley system. The distribution of the Ozark- ian Oedaleothrips hookeri from Union County to Pere Marquette State Park along the Mississippi River and the presence of the Appalachian Phthi
. Bulletin. Natural history; Natural history. 228 Illinois Nati'ral History Survey Billetin Vol. 29, Art. 4. Fig. 24.—Distribution of Leucothrips pierce i in Illinois. In brief, it appears that the gla- ciated regions were repopulated by species coming from the Ozarkian refugia via the Mississippi-Illinois riv- er valley system, and from the Ap- palachian refugia via the Tennessee, Kentucky, and Wabash river valley system. The distribution of the Ozark- ian Oedaleothrips hookeri from Union County to Pere Marquette State Park along the Mississippi River and the presence of the Appalachian Phthiro- thrips morgani and Aeolothrips crassus in the extreme southeastern counties, both species possible immigrants up the Tennessee river valley, are ex- amples of these two types of dispersal. Thrips specific to hosts with archaic and limited distribution, such as He- terothrips azaleae restricted to Azalea, remain confined with their hosts. Other thrips living on widespread vegetation have more or less followed Fig. 25.—Distribution of Sclrtolhrips taxodii in Illinois. their hosts back onto the glaciated areas. Complete association of all thrips with their host plants over the entire range of those hosts is not always the case, however. Liothrips usitatus, found only on Rhus copallina, occurs in southern Illinois but not in northern Illinois where Rhiis copallina sporadi- cally reinvades our state along the In- diana borders of Will, Kankakee, and Cook counties. In the 100 or so years of intensive agricultural cultivation in Illinois, much of the original environment has either been damaged or destroyed. Whereas a widespread prairie thrips once may have been abundant, it now may be confined to but a few fence rows or along railroad tracks in an iso- lated clone of grass or herb. The ulti- mate fate of our thrips, especially those highly restricted to a rigidly cir-. Please note that these images are extracted from scanned page images that may have been digitally enhanced f
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