Byakhee
From Arkham Horror Wiki
Byakhee is a monster. It first appeared in the Arkham Horror board game.
Mythos Source
The first definite appearance of a byakhee occurs in The House on Curwen Street (1944), written by August Derleth. Though the color text in the Call of Cthulhu rulebook which accompanies the byakhee stats is from The Festival, written by H.P. Lovecraft (1925), it is uncertain if the creatures from the two stories are actually the same species.