Hesiod, the Homeric Hymns and Homerica/The Cercopes
Cercopes. These were two brothers living upon the earth who practised every kind of knavery. They were called Cercopes because of their cunning doings: one of them was named Passalus and the other Acmon. Their mother, a daughter of Memnon, seeing their tricks, told them to keep clear of Black-bottom, that is, of Heracles. These Cercopes were sons of Theia and Ocean, and are said to have been turned to stone for trying to deceive Zeus.
"Liars and cheats, skilled in deeds irremediable, accomplished knaves. Far over the world they roamed deceiving men as they wandered continually."
- ↑ i.e. "monkey-men."