The distribution of periodical cicadas The distribution of periodical cicadas in Illinois distributionofpe91stan Year: 1975 8 Fulton County, to June 28 in De Witt County. Sing- ing was heard until June 28, also in De Witt County, and flagging (wilted branches that were girdled in the egg-laying process) was noticed on the same date in that county. Apparently this brood is disjunct in Illinois, the western counties which it inhabits being Brown, Fulton, Henderson, Knox, McDonough, Schuyler, and Warren, and the eastern counties being Champaign. De Witt, and Piatt. Intei-vening counties, partic
The distribution of periodical cicadas The distribution of periodical cicadas in Illinois distributionofpe91stan Year: 1975 8 Fulton County, to June 28 in De Witt County. Sing- ing was heard until June 28, also in De Witt County, and flagging (wilted branches that were girdled in the egg-laying process) was noticed on the same date in that county. Apparently this brood is disjunct in Illinois, the western counties which it inhabits being Brown, Fulton, Henderson, Knox, McDonough, Schuyler, and Warren, and the eastern counties being Champaign. De Witt, and Piatt. Intei-vening counties, particularly Logan and Mason, did not seem to have populations of these cicadas. In the western counties mentioned and De Witt County large numbers of cicadas emerged, whereas Champaign and Piatt counties had only limited emergences. This brood must have emerged simultaneously, in 1946, in some instances in adjacent areas or even in the same woods, with the Great Southern Brood (Marlatt's XIX), and these broods will again emerge simultaneously in 2167. Unfortunately, we have no records of the 1946 emergences in the INHS collection. Both broods may occupy the same woods in Cham- paign County if our records are correctly interpreted. Woods along the Spoon River, Knox County, should be carefully observed in the future to determine whether some of the woods harboring the lowan Brood also support populations of the Great Southern Brood. In 1963 Clarence E. White, an INHS entomologist, collected specimens and reported a large emergence in woods at the junction of Illinois 150 and the Spoon River. In 1972 Kent R. Buffington reported in a letter a large emergence in woods north of that area along the Spoon River near Truro, or Williamsfield, as that town is now called. The 1963 population could be assigned to the lowan Brood and that of 1972 to the Great Southern Brood unless the 1972 emergence was made up of an unusually high number of strag- glers of the 1973 Northern Illinois Brood that i
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