Tetrix subulata is the type species of groundhopper in the genus Tetrix, known as the slender ground-hopper,[2] awl-shaped pygmy grasshopper[3] and the slender grouse locust.

[5][6] T. subulata has a body length of around 9 to 15 mm; its colour is varied, from light grey to very dark or reddish brown.

[2] Before mating, the male and female communicate with visual signals.

If the female is mating, she responds to the male's approach by moving her hind legs up and down.

Adults lay eggs from August and may be found from June-July of the following year.