Periodical cicadas are not seen as adults every year like the annual cicadas. Instead they emerge and become adults usually only every 13 or 17 years. There are a number of different broods of both the 13 and 17 yer cicadas and these are often offset by four years.
The cicadas shown on this page are part of the Brood XIX of the 13 year cicadas. There are three broods of 13 year cicadas. Bood XIX contains all four Magicicada species of 13 year cicadas: M. neotredecim, M. tredecassini, M. tredecim, M. tredecula.
These cicadas were in an area of the Ozark foothills where M. neotredecim have been reported, but the other three species have also been found within 50 miles of this location. These do not have the orange area between the eye and the point where the forewing attaches characteristic of M. tredecim. BugGuide narrowed the ID down to Magicicada tredecassini or Magicicada tredecula. Since the latter is mostly known from North Carolina, I believe that these images are most likely Magicicada tredecula, Cassin's 13-year Cicada.
Periodical cicadas are not currently known to appear in Florida, although there were historical records of them occurring in the panhandle. To see some of the annual cicadas that can be found in Florida visit the Cicadidae family page.