Eric Walker added Periodical cicadas - Wikipedia to Periodical cicadas
Eric Walker added Brood X - Wikipedia and Billions (Yes, Billions) of Brood X Cicadas Will Soon Emerge - The New York Times to Brood X, and added Brood X to Periodical cicadas
Eric Walker added Brood X and Periodical cicadas - Wikipedia to Periodical cicadas, and added Periodical cicadas to Cicadettinae
Eric Walker added Periodical cicadas to Cicadettinae, and added Cicadettinae to Cicadidae