Massive groups of cicada emerges
The periodical cicada emerges in massive groups once every 13 or 17 years and is completely unique to North America. There are 15 of these mass groups, called broods, of periodical cicadas in the United States. Brood II is emerging after a 17-year hiatus into one of the most densely populated urban/suburban forests in the world, ranging from eastern Connecticut south to North Carolina. The following county-based maps depict where and when the different broods of periodical cicadas are likely to emerge in the US. The maps were compiled for the 2011 publication entitled Avian predators are less abundant during periodical cicada emergences, but why? Koenig et al. http://dx.doi.org/10.1890/10-1583.1) using data from two historic periodical cicada publications listed below. The interactive map allows the user to view different brood combinations and should be viewed with the Adobe Acrobat Reader. The static map is better for mobile devices and tablets.
Marlatt, C. L. 1907. The periodical cicada. Bulletin of the USDA Bureau of Entomology 71:1–181. Simon, C. 1988. Evolution of 13- and 17-year periodical cicadas. (Homoptera: Cicadidae). Bulletin of the Entomological Society of America 34:163–176.