This paper is an account of the co-construction of categorical identity and personal identity among human beings. As people recognize themselves within a socially sanctioned categorical scheme, they reproduce that scheme, and hence institutional and personal reflexivity occur as a joint movement that, at the same time, can be seen as an exercise in social control. The inspirations for this account are lan Hacking's view about the distinctiveness of social kinds from natural kinds, and Dan Sperber's idea about cultural communication (...) as a form of social epidemiology. (shrink)