Brood XXIII (13-year)
The Lower Mississippi Valley Brood
Brood XXIII has a close relationship with Brood XIX. Brood XXIII contains populations of M. neotredecim but does not show as strong a pattern of reproductive character displacement as Brood XIX. An odd, isolated population of Brood XXIII is found in DeWitt County, IL.
The map above was generated from positive records in the Cicada Central Database on 31 December 2010. The database is not exhaustive, and this map is intended to portray only an approximate, present-day distribution.
The map below is based on previously published maps (Marlatt 1923; Simon 1988) and unpublished data. However, it has not been field checked, and it does not portray historical reports of brood emergences.
A project is currently underway to make new maps of periodical cicada broods. See the Magicicada mapping project homepage.
Literature:
Marlatt, C. 1923. The Periodical Cicada. United States Department of Agriculture, Bureau of Entomology Bulletin 71.
Simon, C. 1988. Evolution of 13- and 17-year periodical cicadas. Bulletin of the Entomological Society of America 34:163-176.
©2011