. The distribution of periodical cicadas in Illinois. Periodical cicada. in Urbana, Champaign County, on a Liriodendron tree, a non-native tree, planted there 8 years previ- ously. Seventeen years earlier in 1953 when this brood emerged, a straggler was also found in Urbana by Dr. R. J. Dysart on August 12. Despite the scanty records in Champaign County, it is possible that the Great Eastern Brood occurred and still persists in small numbers in the Big Grove of Urbana and that eastern Champaign County should be included in the list of counties inhabited by this brood. The 17-year Great Eastern
. The distribution of periodical cicadas in Illinois. Periodical cicada. in Urbana, Champaign County, on a Liriodendron tree, a non-native tree, planted there 8 years previ- ously. Seventeen years earlier in 1953 when this brood emerged, a straggler was also found in Urbana by Dr. R. J. Dysart on August 12. Despite the scanty records in Champaign County, it is possible that the Great Eastern Brood occurred and still persists in small numbers in the Big Grove of Urbana and that eastern Champaign County should be included in the list of counties inhabited by this brood. The 17-year Great Eastern Brood (Marlatt's X) must have emerged in Illinois adjacent to and at the same time as the 13-year Great Southern Brood (Marlatt's XIX) in 1647 and 1868, and they should ap- pear together again in 2089. Furthermore, the Great Eastern Brood must have emerged adjacent to and at the same time as the 13-year Lower Mississippi River \'alley Brood (Marlatt's XXIII) along the border of Clark and Crawford counties in 1664 and 1885, and they should occur together again in 2106. According to Marlatt (1907) and as reinterpreted by Dybas (1970), this brood has three main but I almost certainly disjunct centers: a broad portion of Indiana and western Ohio, a wide area pri- marily bordering the Mason-Dixon line in Maryland and Pennsylvania, and an area in the southern Ap- palachians. I The Great Southern Brood (Marlatt's XIX) The Great Southern Brood has a 13-year cycle ami emerged last in 1972. This brood emerges in .iljundant numbers largely outside the limits of the \\ isconsin moraine, except through the east-central rc'^ion of the state, and outside the areas occupied In the Great Eastern Brood (Marlatt's X) and the Lower Mississippi River Valley Brood (Marlatt's j XXIII) (Fig. 3). An isolated colony of "extremely heavy populations of cicadas" was reported to us by [k. R. BufRngton on May 18-20, 1972 along the Spoon River near Truro, now called Williamsfield, in Knox County. A
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