Information authenticated by Professor Mike Ritchie of the University of St Andrews
http://biology.st-and.ac.uk, with the support of the British Ecological Society
http://www.britishecologicalsociety.org
Incomplete metamorphosis: Type of insect development (also known as hemimetabolous development) in which the adult form is reached via a series of moults. The larva (nymph) resembles a miniature wingless adult; the wings develop externally as the nymph grows.
Larvae: Stage in an animal's lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
Stridulation: Production of sound by rubbing a file across a membrane. In insects, often a file on a wing rubs against the surface of the other wing, or the file is on a leg which is scraped on the wing.