Arulenus is a genus of pygmy grasshopper.

Characteristic features of this genus include: the lack of tegmina and of alae, a smooth pronotum with large, slightly wrinkled spines on its discus, and outwardly turned lateral paranotal lobes.

[1]: 385 Carl Stål circumscribed Arulenus in 1877 for the species A. validispinus and A. punctatus, which Stål described in the same paper.

[2] In 1887, Ignacio Bolívar transferred A. punctatus to its own, new genus Hirrius, giving it the name Hirrius punctatus.

[3] Arulenus would be considered a monospecific genus until 2016 with Josip Skejo and Joy Honezza S. Caballero's description of Arulenus miae.