The Shenandoah Valley Brood
Brood I is among the smallest broods of 17-year cicadas. The brood is found in the Shenandoah Valley near the Blue Ridge Mountains, with sparse populations along the Blue Ridge Parkway and on Massanutten Mountain. Brood I has disjunct populations on Long Island and near Bristol VA/Bristol TN.
In the map below, cicada symbols are verified presence records and red crosses are verified absence records in our database as of August 2023. Gold symbols are from Simon (1988); smaller symbols are records with a lower degree of certainty and black crosses represent records that are considered spurious. Blue symbols are from Marlatt (1923); smaller symbols are records with a lower degree of certainty and question marks represent records that are considered spurious. Symbols are in layered in the order Database, Simon, Marlatt, and symbols in the upper layers may obscure symbols in lower layers. Some absence records in the database are not shown for clarity. This map may not be reproduced without written permission.
Cooley, J. R. 2015. The distribution of periodical cicada (Magicicada) Brood I in 2012, with previously unreported disjunct populations (Hemiptera: Cicadidae). The American Entomologist 61:52-57.
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.