The traditional view of the null subject as pro identified by Agr (the φ−features of I) cannot be maintained in a theory where Agr is uninterpretable. Two hypotheses are compared with regard to the predictions they make for Finnish null subject constructions: (A) Agr is interpretable in null-subject languages, and pro is therefore redundant; (B) Null subjects are specified but unpronounced pronouns which assign values to the uninterpretable features of Agr. Since Finnish observes the EPP and has an expletive pronoun, Hypothesis A predicts that null subjects should co-occur with expletives. The prediction is false, favouring B over A.A typology of null subjects is proposed: Null bound pronouns and null generic pronouns in partial null-subject languages, including Finnish, are D-less φPs, and so are null subjects in consistent null-subject languages with Agr, such as Spanish, Greek, etc. Null 1 st and 2 nd person subjects in Finnish are DPs which are deleted. Null pronouns in languages without Agr, such as Chinese or Japanese are the only true instances of pro, a minimally specified null noun.key words: null subject, empty category, phi-feature, expletive, pronoun,