​SILVERFISH, a small active insect, so-called from the silvery glitter of the scales covering the body. It is less than half an inch long and is found in damp corners or amongst books and papers in houses. Although accredited with destroying paper and linen, it probably feeds only on farinaceous or saccharine substances. Scientifically it is known as Lepisma saccharina and belongs to the sub-order Thysanura of the order Aptera.