Ox-Head (simplified Chinese: 牛头; traditional Chinese: 牛頭; pinyin: niútóu; Wade–Giles: niu2-t'ou2) and Horse-Face (simplified Chinese: 马面; traditional Chinese: 馬面; pinyin: mǎmiàn; Wade–Giles: ma3-mien4) are two guardians or types of guardians of the Underworld in Chinese mythology. As indicated by their names, both have the bodies of men, but Ox-Head has the head of an ox while Horse-Face has the face of a horse. They are the first beings a dead soul encounters upon entering the Underworld; in many stories they directly escort the newly dead to the Underworld.
https://en.wikipedia.org/wiki/Ox-Head_and_Horse-Face