May 11, 2019 We expect some periodical cicadas to emerge earlier and later than expected this year: Members of Brood IV, the Kansan Brood, should emerge in IA, KS, MO, NE, OK & TX. ... Members of Brood XXIII, the Mississippi Valley Brood, should emerge in AR, IL, IN, KY, LA, MO, MS, & TN. XIX last emerged 4 years ago.