Institutional Change and Ethnoterritorial Party Representation at the European Level Bonnie M. Meguid University of Rochester Department of Political Science 306 Harkness Hall Rochester, NY 14627, USA Bonnie.meguid@rochester.edu Prepared for presentation at the “European Identities? Regionalism, Nationalism and Religion” Conference, London, UK, October 2008. The research for this paper was supported by the Wallis Institute’s Program in Empirical Policy Research and the Charles E. Lanni Research Fellowships. I would like to thank the conference participants, especially Margarita Gomez- Reino, Giovanni Capoccia and William Miller, for their helpful comments. I am grateful to Bonnie Field and Jae-Jae Spoon for their suggestions and access to election data. I thank Matthew Jacobsmeier and Jessica Stoll for their research assistance.