. The distribution of periodical cicadas in Illinois. Periodical cicada. 10 every 65 or 78 years at some part of the Great Southern Brood's total range in Ilhnois, but only once every 221 years at each specific locality. A limited number of specimens of this brood were collected in the twin cities of Champaign-Urbana in 1959 and in 1972. They were taken even in those parts of the cities which were originally prairie or were cultivated land less than years previously but which are now studded with trees. Moderate singing also was heard by competent observers in both of these years. It wo
. The distribution of periodical cicadas in Illinois. Periodical cicada. 10 every 65 or 78 years at some part of the Great Southern Brood's total range in Ilhnois, but only once every 221 years at each specific locality. A limited number of specimens of this brood were collected in the twin cities of Champaign-Urbana in 1959 and in 1972. They were taken even in those parts of the cities which were originally prairie or were cultivated land less than years previously but which are now studded with trees. Moderate singing also was heard by competent observers in both of these years. It would seem, therefore, that colonizing cicadas succeeded in expanding their range at least a few miles into new parklands and tliat the population level for survival need not be extremely high. Although bird populations are low in some parts of these cities, where birds are present, cicadas are eagerly sought. In one instance a dozen live cicadas were placed on a hedge in Urbana near a bird-feeding tray. Within 1 minute a blue jay appeared and seized one of the sluggish cicadas. Shortly, this jay returned and was joined by another. AU, or at least 11, of the cicadas were quickly taken by the jays; the fate of the last cicada was not determined in the con- fusion of the jays' visits to the hedge. Other birds, including hawks, were found to have fed heavily on these cicadas in southern Illinois (Dr. R. R. Graber personal communication 1972). Unpublished reports by Dr. G. W. Bennett indi- cate that game fish benefited from the abundance of this brood in 1972. Fishes at Fox Ridge State Park, Coles County, fed voraciously on these insects. Cicadas at that site weighed from about V2 gram to nearly a full gram. The Northern Illinois Brood (Marlatt's XIII) The Northern Illinois Brood has a 17-year cycle, and its most recent emergence was in Possibly because a wet, cool spring delayed the emergence, the earliest 1973 records of this brood (Fig. 4) were not taken until May 31 (Tazew
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Keywords: ., bookcentury1900, bookpublisherurban, booksubjectperiodicalcicada
