This is a seal from the book "Lesser Key of Solomon". According this text, the spirit Alloces, is described thus
"The Fifty-second Spirit is Alloces,
or Alocas. He is a Duke, Great, Mighty, and Strong,
appearing in the Form of a Soldier1 riding upon a Great
Horse. His Face is like that of a Lion, very Red, and
having Flaming Eyes. His Speech is hoarse and very
big.2 His Office is to teach the Art of Astronomy, and
all the Liberal Sciences. He bringeth unto thee Good
Familiars; also he ruleth over 36 Legions of Spirits.
His Seal is this, which, etc"