David G. Fox/Oxford Scientific Films
Aside from the true locusts, the periodical cicada is another important insect to which the name locust is applied. Grouse, or pygmy, locusts are small, jumping insects that are of little economic importance. Most species are dark brown and are less than 2.5 cm (less than 1 in) in length.
Scientific classification: Locusts belong to the order Orthoptera. True locusts belong to the family Acrididae. Grouse, or pygmy, locusts belong to the family Tetrigidae.