Historical clue formulations

• They're noisy little buggers — 2026-04-23
• Ants : colony :: ___ : plague — 2023-06-11
• Insects that may emerge after 17 years — 2020-08-10
• Large, noisy insects — 2020-04-09
• 17-year insects — 2017-01-02
• Insects on a 17-year cycle — 2016-10-12
• Insects in swarms — 2009-10-28
• Flying noisemakers — 2004-12-25