The NF claimed that most non-white racial groups were genetically inferior to "Caucasoids and Mongoloids". This time, regression equations for Whites, Negroes, Mongoloids, Mexicans and Puerto Ricans were derived. Carleton S. Coon also has a hypothesis for why noses on Mongoloids are very distinct. Whites have femurs that are ""intermediate in both curvature and twisting"" between Mongoloids and blacks. The peculiarity of the Mongoloids was the influence by synanthropes. The basis of these claims relies on the fact that they are Mongoloids. Presence of Mongoloids on the islands an unknown point in history was suggested. The Khasi is a branch of the Mon-khem race while Jaintia belongs to the Mongoloids.