The distribution of periodical cicadas The distribution of periodical cicadas in Illinois distributionofpe91stan Year: 1975 is a possible 1-year-early emergence of the 17- year Northern Illinois Brood (Marlatt's XIII) of 1905. 1932. Urbana, Champaign County, Universit\' Woods, September 6. Rocky Branch, Clarksville, Clark County, June 24. These are possibly 1-year- early emergences of the 13-year Great Southern Brood (Marlatt's XIX) of 1933. 1957. Sullivan, Moultrie County, 'late in season,' H. B. Cunningham, six specimens. This is pos- sibly a P/2-year-early emergence of the 13-year Great S
The distribution of periodical cicadas The distribution of periodical cicadas in Illinois distributionofpe91stan Year: 1975 is a possible 1-year-early emergence of the 17- year Northern Illinois Brood (Marlatt's XIII) of 1905. 1932. Urbana, Champaign County, Universit\' Woods, September 6. Rocky Branch, Clarksville, Clark County, June 24. These are possibly 1-year- early emergences of the 13-year Great Southern Brood (Marlatt's XIX) of 1933. 1957. Sullivan, Moultrie County, 'late in season,' H. B. Cunningham, six specimens. This is pos- sibly a P/2-year-early emergence of the 13-year Great Southern Brood (Marlatt's XIX) of 1959. 1969. Lisle, DuPage County, June 6, L. J. Stannard, just emerged at edge of a lowland woods in Morton Arboretum. Chicago Heights, Cook County, June 11, H. B. Petty. Chicago area, many specimens reported to the Natural His- tory Survey extension staff. (See Dybas 1969 for extensive list of localities in the Chicago region.) These are assumed to be 4-year-early emergences of the 17-vear Northern Illinois Brood (Marlatt's XIII) of 1973. 1971. Barry, Pike County, June 9, J. Cruttenden, several specimens. Tentatively assigned to M. tredecassini by T. E. Moore (personal com- munication 1971). These are probably 1-year- early emergences of the 13-vear Great Southern Brood (Marlatt's XIX) of 1972. Mr. Cruttenden recalls the presence of this brood in the area in 1959. 1972. Lisle, DuPage County, October 12, J. Appleby, one adult next to its shed skin, emerged after flood in Morton Arboretum. This is possibly a half-year-early emergence of the 17-year North- em Illinois Brood (Marlatt's XIII) of 1973. 1973. Mahomet, Champaign County, Nettie Hart Memorial Woods, June 6, M. W. Sanderson. This is a possible 1-year-late emergence of the 13-year Great Southern Brood (Marlatt's XIX) which emerged in 1972. 1974. Lisle, DuPage County, Ma>' 29, J. Appleby, one adult on bush. Ohio, Lee County, May 23, Gene R. Kritsky, one adult in flight hit car. These are
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