<P> In 1898, entomologist C.L. Marlatt assigned Roman numerals to 30 different broods of periodical cicadas: 17 distinct broods with a 17 - year lifecycle, to which he assigned brood numbers I through XVII (with emerging years 1893 through 1909); plus 13 broods with a 13 - year cycle, to which he assigned brood numbers XVIII through XXX (1893 through 1905). </P> <P> Many of these hypothetical 30 broods, however, have not been observed . Furthermore, two of the brood numbers assigned by Marlatt (broods XI and XXI) existed at one time, but have become extinct . The Marlatt numbering scheme has been retained for convenience (and because it clearly separates 13 - and 17 - year lifecycles), although today only 15 broods are known to survive . </P> <Table> <Tr> <Th> Name </Th> <Th> Nickname </Th> <Th> Cycle (yrs) </Th> <Th> Last emergence </Th> <Th> Next emergence </Th> <Th> Extent </Th> </Tr> <Tr> <Td> 01! Brood I </Td> <Td> Blue Ridge brood </Td> <Td> 17 </Td> <Td> 2012 </Td> <Td> 2029 </Td> <Td> Western VA, WV </Td> </Tr> <Tr> <Td> 02! Brood II </Td> <Td> East Coast brood </Td> <Td> 17 </Td> <Td> 2013 </Td> <Td> 2030 </Td> <Td> CT, MD, NC, NJ, NY, PA, DE, VA, DC </Td> </Tr> <Tr> <Td> 03! Brood III </Td> <Td> Iowan brood </Td> <Td> 17 </Td> <Td> 2014 </Td> <Td> 2031 </Td> <Td> IA </Td> </Tr> <Tr> <Td> 04! Brood IV </Td> <Td> Kansan brood </Td> <Td> 17 </Td> <Td> 2015 </Td> <Td> 2032 </Td> <Td> Eastern NE, southeastern IA, eastern KS, western MO, OK, north TX </Td> </Tr> <Tr> <Td> 05! Brood V </Td> <Td> </Td> <Td> 17 </Td> <Td> 2016 </Td> <Td> 2033 </Td> <Td> Eastern OH, Western MD, Southwestern PA, Northwestern VA, WV </Td> </Tr> <Tr> <Td> 06! Brood VI </Td> <Td> </Td> <Td> 17 </Td> <Td> 2017 </Td> <Td> 2034 </Td> <Td> Northern GA, western NC, northwestern SC </Td> </Tr> <Tr> <Td> 07! Brood VII </Td> <Td> Onondaga brood </Td> <Td> 17 </Td> <Td> </Td> <Td> 2018 </Td> <Td> Ontario, Yates, and Seneca Counties NY </Td> </Tr> <Tr> <Td> 08! Brood VIII </Td> <Td> </Td> <Td> 17 </Td> <Td> 2002 </Td> <Td> 2019 </Td> <Td> Eastern OH, western PA, northern WV </Td> </Tr> <Tr> <Td> 09! Brood IX </Td> <Td> </Td> <Td> 17 </Td> <Td> 2003 </Td> <Td> 2020 </Td> <Td> Western VA, southern WV, western NC </Td> </Tr> <Tr> <Td> 10! Brood X </Td> <Td> Great eastern brood </Td> <Td> 17 </Td> <Td> </Td> <Td> 2021 </Td> <Td> NY, NJ, PA, DE, MD, DC, VA, WV, NC, GA, TN, KY, OH, IN, IL, MI </Td> </Tr> <Tr> <Td> 11! Brood XI </Td> <Td> </Td> <Td> 17 </Td> <Td> 1954 </Td> <Td> Extinct </Td> <Td> Last seen in 1954 in Ashford, CT along the Fenton River </Td> </Tr> <Tr> <Td> 13! Brood XIII </Td> <Td> Northern Illinois brood </Td> <Td> 17 </Td> <Td> 2007 </Td> <Td> 2024 </Td> <Td> Northern IL and in parts of IA, WI, and IN </Td> </Tr> <Tr> <Td> 14! Brood XIV </Td> <Td> </Td> <Td> 17 </Td> <Td> 2008 </Td> <Td> 2025 </Td> <Td> Southern OH, KY, TN, MA, MD, NC, PA, northern GA, western VA and WV, and parts of NY and NJ </Td> </Tr> <Tr> <Td> 19! Brood XIX </Td> <Td> Great Southern Brood </Td> <Td> 13 </Td> <Td> 2011 </Td> <Td> 2024 </Td> <Td> AL, AR, GA, IN, IL, KY, LA, MD, MO, MS, NC, OK, SC, TN, and VA </Td> </Tr> <Tr> <Td> 21! Brood XXI </Td> <Td> Floridian Brood </Td> <Td> 13 </Td> <Td> 1870 </Td> <Td> Extinct </Td> <Td> Last recorded in 1870, historical range included the FL panhandle </Td> </Tr> <Tr> <Td> 22! Brood XXII </Td> <Td> Baton Rouge brood </Td> <Td> 13 </Td> <Td> 2014 </Td> <Td> 2027 </Td> <Td> LA, MS </Td> </Tr> <Tr> <Td> 23! Brood XXIII </Td> <Td> Lower Mississippi River Valley brood </Td> <Td> 13 </Td> <Td> 2015 </Td> <Td> 2028 </Td> <Td> AR, IL, IN, KY, LA, MO, MS, TN </Td> </Tr> <Tr> <Td_colspan="6"> <Ol> <Li> Jump up ^ Consists only of M. septendecim </Li> <Li> Jump up ^ Largest of all 17 - year periodical broods </Li> <Li> ^ Jump up to: Premature emergences, or "straggling" occurred in 2003 and 2006 . </Li> <Li> Jump up ^ Largest of all 13 - year periodical cicada broods </Li> <Li> Jump up ^ This 13 - year brood does not include M. neotredecim . </Li> </Ol> </Td> </Tr> </Table> <Tr> <Th> Name </Th> <Th> Nickname </Th> <Th> Cycle (yrs) </Th> <Th> Last emergence </Th> <Th> Next emergence </Th> <Th> Extent </Th> </Tr>

When was the last time the cicadas were here
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