Elongate insects with biting mouthparts and long, slender antenae.
Forewings modified into short, leathery 'wing-cases' (elytra) which meet in the mid-line and reach only a short way down the
body. The large, membranous hindwings are semi-circular with radial veins and when not in use they are folded in a complex
manner under the small front wings, although many species are entirely wingless. The cerci are modified into stout forceps
or pincers at the end of the abdomen, more strongly curved in the male than in the female. Metamorphosis is slight, normally
with four nymphal stages. This is a small Order of about 1,000 species worldwide, of which only four are native to the