Brood XI (17-year)
Brood XI was last recorded near the Ashford/Willington town line in eastern CT. The last recorded emergence was on a dairy farm in 1954; no sightings were recorded in 1971, 1988, or 2005. Records in RI seem doubtful, because of sandy and wet soils. (Manter 1974)
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The map below is based on previously published maps (Marlatt 1923; Simon 1988) and unpublished data.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.
Marlatt, C. 1923. The Periodical Cicada. United States Department of Agriculture, Bureau of Entomology Bulletin 71.
Manter, J. A. 1974. Brood XI of the periodical cicada seems doomed. Pp. 99-100 in R. L. Beard, ed. 25th Anniversary Memiors of the Connecticut Entomological Society. Connecticut Entomological Society, New Haven.
Simon, C. 1988. Evolution of 13- and 17-year periodical cicadas. Bulletin of the Entomological Society of America 34:163-176.