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.
Most manuscripts describe Halphas as a hoarse-voiced stock dove (though Weyer and Colin de Plancy’s Dictionnaire Infernal describe him as a stork), who supplies weapons and ammunition for towers (Weyer and de Plancy have “towns” or “villes” instead), sends men to war, and commands 26 legions of spirits.
According to Rudd, Halphas is opposed by the Shemhamphorasch angel Haamiah.
