ACKNOWLEDGMENTS

Data for this paper were collected during my time spent at the UCMP collection for another project funded by the Deutsche Forschungsgemeinschaft (DFG grant ST 798/1-1), a visit to the AMNH funded by the AMNH grants office and a visit to the SDSM partially funded by a DFG travel grant (STE 798/5-1). Some money was available through the National Park Service. I want to thank those responsible for the collections at the institutions, in particular S. Bell AMNH, L. Barnes LACM, J. Martin SDSM, M. Woodburne at the University of Riversligh and P. Holroyd UCMP for the access to specimens under their care.