Mormon cricket

noun
  1. a flightless, long-horned grasshopper, Anabrus simplex, of the western U.S., that is destructive to range grasses and cultivated crops.

Origin of Mormon cricket

First recorded in 1895–1900; so named because found where the Mormons settled
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018