Mouthparts for biting. Hind legs usually enlarged and modified for
jumping. Tarsi nearly always 3-4 jointed. Thorax generally with two pairs of wings, the front pair tough and leathery,
although one or both pairs may be reduced or absent. Cerci present, but often short and inconspicuous. Female with a well
developed ovipositor, usually protruding from the tip of the abdomen and visible externally (used for egg-laying). Simple
metamorphosis. A large Order, with over 17,000 described species worldwide, but represented in the British Isles by only
30 species. Orthoptera fall into two principal large groups: (a) Crickets, including Mole Crickets and Bush Crickets, sometimes called Long-horned Grasshoppers
(families Gryllidae, Gryllotalpidae, Tettigonidae and their allies). These are mostly omnivorous and live on or under the
ground, although Bush Crickets are often vegetarian, feeding on the leaves of trees and bushes, and occasionally they become
minor pests of agricultural crops. A few species are predatory, feeding on other insects. The males of most species stridulate
('chirp' or 'sing') by rubbing together modified areas of the forewings. Both sexes have auditory organs in the front legs.
(b) Short-horned Grasshoppers, including Locusts (family Acrididae and its allies). These are mainly plant feeders and many,
besides the notorious Locusts, can be serious pests of agriculture. Antennae, cerci and female ovipositor, much shorter than
those of Crickets. In the majority of species, both sexes (but especially the males) stridulate by rubbing the hind legs
against the forewings, and they have an auditory organ at the base of the abdomen.