The demon Marchosias appears in the grimoires Book of Incantations, The Discoverie of Witchcraft, The Book of Spirits, Pseudomonarchia Daemonum, and The Lesser Key of Solomon
From The Lesser Key of Solomon, Crowley/Mathers edition:
The Thirty-fifth Spirit is Marchosias. He is a Great and Mighty Marquis, appearing at first in the form of a Wolf having Gryphon's Wings, and a Serpent's Tail, and Vomiting Fire out of his mouth. But after a time, at the command of the Exorcist he putteth on the Shape of a Man. And he is a strong fighter. He was of the Order of Dominations. He governeth 30 Legions of Spirits. He told his Chief, who was Solomon, that after 1,200 years he had hopes to return unto the Seventh Throne. And his Seal is this, to be made and worn as a Lamen, etc.