E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Psycarpax [granary thief].
Son of Troxartas, King of the Mice. The Frogking offered to carry the young prince over a lake, but scarcely had he got midway when a water-hydra appeared, and King Frog, to save himself, dived under water. The mouse, being thus left on the surface, was drowned, and this catastrophe brought about the battle of the Frogs and Mice.