Brood IX populations in North Carolina are more or less restricted to upland sites, but some isolated populations are found in lower elevation areas adjacent to the Blue Ridge.

Literature
Marlatt, C. L. 1923. The Periodical Cicada. United States Department of Agriculture, Bureau of Entomology Bulletin 71:1-183.
Simon, C. and Lloyd, M. 1982. Disjunct synchronic population of 17-year periodical cicadas: Relicts or evidence of polyphyly? Journal of the New York Entomological Society, 110, 275-301.
Simon, C. 1988. Evolution of 13- and 17-year periodical cicadas. Bulletin of the Entomological Society of America 34:163-176.