Periodical Cicadas
Brood X (17-year)
The Great Eastern Brood
Brood X is the largest (by geographic extent) brood of 17- year cicadas. Populations historically recorded from KY may be off-cycle emergences of Brood XIV (see: Lloyd and White 1976). Brood X has also been reported from MO; however, current opinion on these records is that they date from a co-emergence of XIX and X, and that they were mistakenly attributed to X. For a discussion of Brood X in MO, see: Marshall 2001). MI populations are generally only M. septendecim; however, M. cassini has been recorded in the state (Marshall et al. 1996).