What is "indris diadema"

Indris \In"dris\, Indri \In"dri\, n. (Zo["o]l.) Any lemurine animal of the genus Indris.

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.