Jacques Tassin1, Ken Thompson2, Scott P Carroll3, Chris D Thomas4. 1. Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), UPR Forêts & Sociétés, 34398 Montpellier, France. 2. Department of Animal and Plant Sciences, Western Bank, University of Sheffield, Sheffield S10 2TN, UK. 3. Institute for Contemporary Evolution, 711 Oak Avenue, Davis, CA 95616, USA; Department of Entomology & Nematology, University of California Davis, Davis, CA 95616,USA. 4. Department of Biology, University of York, Wentworth Way, York, YO10 5DD, UK. Electronic address: chris.thomas@york.ac.uk.