The Collaborative International Dictionary of English v.0.48:

Indris \In"dris\, Indri \In"dri\, n. (Zool.)
   Any lemurine animal of the genus Indris.
   [1913 Webster]

   Note: Several species are known, all of them natives of
         Madagascar, as the diadem indris (Indris diadema),
         which has a white ruff around the forehead; the woolly
         indris (Indris laniger); and the short-tailed or
         black indris (Indris brevicaudatus), which is black,
         varied with gray.
         [1913 Webster]