Generalized distributions of extant 17-year broods of periodical cicadas. All ranges include Magicicada septendecim, M. cassini, and M. septendecula except that brood VII has only M. septendecim. The Great Lakes, Mississippi River, Appalachian uplift area, and Wisconsinan (Pleistocene) glacial boundary (dashed line) are also shown. (Modified from Alexander & Moore 1962)

Maps are from Fig. 6, Thomas E. Moore, 1993, Acoustic signals and speciation in cicadas (Insecta: Homoptera: Cicadidae), pages 269-284 in Evolutionary Patterns and Processes, Linnean Soc. Symposium No. 14, D.R. Lees and D. Edwards (eds.), London: Academic Press.