12 to 15 feet long "snake men". Have two flexible arms ending in formidable claws. They have no legs and so they move by undularing like a snake. Reptilian head is thrust forward. Oviparous.
They have a rigidly stratified society where treason, theft and cruelty is considered good behaviour if it is from the higher ranks againts the lower. But if you don¨t get caught it's also acceptable the other way around. They keep slaves and are notorius slave raiders and attackers.
Sources: GURPS Aliens,