Tetrix arenosa, known generally as the obscure pygmy grasshopper or obscure grouse locust, is a species of pygmy grasshopper in the family Tetrigidae. It is found in North America.
Subspecies These two subspecies belong to the species Tetrix arenosa: Tetrix arenosa angusta (Hancock, 1896) Tetrix arenosa arenosa Burmeister, 1838
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