The Floridian Brood
Brood XXI was last recorded in 1870, in the Apalachicola River Valley. Records along the Georgia/Alabama border are almost certainly spurious.
This brood was not recognized by Simon (1988). 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.
Marlatt, C. L. 1923. The Periodical Cicada. United States Department of Agriculture, Bureau of Entomology Bulletin 71:1-183.