Out of what crypt they crawl, I cannot tell
But every night I see the rubbery things
Black, horned, and slender, with membraneous wings
And tails that bear the bifid barb of hell.
They come in legions on the north wind's swell,
With obscene clutch that titillates and stings,
Snatching me off on monstrous voyagings
To grey worlds hidden deep in nightmare's well.
-- H.P. Lovecraft, "Night-Gaunts"