The social history in the 60's decade "re-discovered" the favorite tools of genealogists: parochial and census registry. Since de 90's decade, this documentation has been essential to study the colonial society in respect of what has been called "social-racial configuration" or "social-ethnic classifications". In this work these are understood as colonial practices, meaning, re-writings of pre-existing realities and conformation and consolidation, in the act of registering, of a new reality, from the field of history of mentalities, understanding the practice of naming, labeling and classification as knowledge construction forms, representation schemes and political imaginary.