As the geopolitical disposition changed in 1898, Spain tried to articulate its Africanism as to justify and value its presence in the colonies left in Africa. This Africanism represented a political strategy that gave a humanist version of its own interests in the colonies. The case of Spanish Guinea brings up a story where this recreation have particular setbacks, as it was difficult to put together a common racial background. But, as the colony changed its status and economic significance, the strategy also changed, making it possible to dissolve the prior, rigid, racial differences deployed in statistic documents. This essay follows the discourses made from anthropology and governmental archives on indigenous Guinean identity, and studies how categories were mutating categories as to accept the colonial role of the Nation: from negative categories based on stereotypes of low profile for labor to assimilation and usefulness. The paper in centered on the confection of a colonial census (1950) and its feedback with anthropological discourses as to capture the colonial-administrative incursion and the representation of the Spanish in the geopolitical arena. Key words: Spanish Guinea, census, race, Africanism.