Gerald, while they took their first long, rapt look, stood at one side, with a smile like a faun's when a faun is mephistophelian.
"Aurora the Magnificent"
Gertrude Hall
Smiling that same mephistophelian smile, Lucian Davlin sauntered away, apparently satisfied with himself and what was passing in his mind.
"Madeline Payne, the Detective's Daughter"
Lawrence L. Lynch
We have moods of piety and moods in which the mental attitude towards all human aspirations can only be described as mephistophelian.
"The Youth of Goethe"
Peter Hume Brown