Pseudomonarchia Daemonum
In demonology, Halphas (listed in Rudd's edition as "Malthas", and in the Crowley/Mathers edition as "Halphas", "Malthus", or "Malphas") is the thirty-eighth demon in the "Ars Goetia" in the "Lesser Key of Solomon" (forty-third in Johann Weyer's Pseudomonarchia Daemonum), ranked as an earl.