Variations: Pyrausta, Piralis
The Pyrallis or Pyrausta is an insect native to the copper-smelting furnaces of Cyprus. It resembles a large fly with four legs.
A pyrallis can only be seen within a fire, flitting and flying through the flames. It cannot survive outside fire, and dies instantly if it flies out of it. In fact, Pliny believed the pyrallis was born from the fire itself.
There is a persistent rumor that the pyrallis has dragon features or something to do with dragons, but this is inaccurate. This misconception likely stems from the whimsical book Inventorum Natura, which presents an entirely fictitious “lost” Plinian manuscript.
Pliny; Bostock, J. and Riley, H. T. trans. (1857) The Natural History of Pliny, v. III. Henry G. Bohn, London.
Unknown. (1538) Ortus Sanitatis. Joannes de Cereto de Tridino.
Woodruff, U. (1979) Inventorum Natura. Paper Tiger, England.