Fascinating thread.  But it makes me miss Tim Murphy all over again. 

To all the titles listed above, I'd add:
1929:  Unmasked.  The Witching Eyes.  (Dave Sindelar recently turned up a copy of Strange Cargo.)
1930:  The Furies.  The Green Ghost.  In the Next Room.  A Royal Romance.  Le Spectre Vert.  Temple Tower.
1931:  A Dangerous Affair (saw a few reels at the Library of Congress when I was there some 20 years ago). 
1933:  The Horror.
1934:  Drums o'Voodoo.
1935:  Obeah (think there was a thead re this in the last year or so).
1937:  Wajan (which thread also touched on this). 
1944:  Strangers in the Night (Everson brought this to the PFA in Berkeley in the '80s).
1946:  The Haunted Mine.  Invisible Informer (these latter two are probably around, just haven't turned up for me).  Voodoo Devil Drums.smiley: tongue

                                                 "The peasants are aroused!"