1908. This is the manuscript of Bulletin 34 of the Bureau of American Ethnology, by Hrdlicka, Assistant Curator in charge of the Division of Physical Anthropology, United States National Museum. This bulletin comprises the results of extended researches and personal observations among a large number of tribes occupying the arid region of the Southwest and deals with matters of great importance to the aborigines and to those agencies, governmental and otherwise, interested in promoting their welfare, as well as to the science of Anthropology at large.