NIU T'OU, NIU TU
Mythology of China
This is the name of a monstrous demonic messenger from HELL in the mythology of China. NIU T'OU is described as a humanoid monster with the head of an ox, hence the name, which means "ox head". He and MA MIEN are the attendants and messengers of YEN-LO, the ruler of the dead and those in HELL. They were armed with official warrants for the souls of the departed, whom they conducted to the HALLS OF JUDGEMENT.
Source: Giants, Monsters, and Dragons: An Encyclopedia of Folklore, Legend, and Myth