These studies would not be possible if it were not for the many individuals from around the world who kindly donated fleas for DNA analysis. To date, the following persons have contributed fleas from their respective geographical regions and we would like to acknowledge their efforts.

Andres Angula, Mauricio Alarcón & Patricia Chandia, Departmento de Zoologia, Universidad de Concepcion, Casilla, Concepcion, Chile

Kevin L. Campbell, Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada

Robert S. Copeland, Biodiversity and Conservation Programme, International Centre of Insect Physiology and Ecology, Nairobi, Kenya

Michael Driessen, World Heritage Area Zoologist, Parks and Wildlife Service, Hobart, Tasmania 7001, Australia

Jean-Marc Duplantier, Programme RAMSE, Antananarivo, Madagascar

Ralph P. Eckerlin, Department of Biology, Northern Virginia Community College, Annandale, Virginia, U.S.A.

Robert Elbel, Brad Lengus, and John Vincent, Department of Biology, University of Utah, Salt Lake City, Utah, U.S.A.

Richard Fagerlund, Environmental Services, University of New Mexico, Albuquerque, New Mexico, U.S.A.

Karl Frafjord, Tromsø Museum, University of Tromsø, Norway

Milton H. Gallardo, Instituto de Ecologia y Evolucion, Universidad Austral de Chile, Valdivia, Chile

William L. Gannon, Museum of Southwestern Biology, University of New Mexico, Albuquerque, New Mexico, U.S.A.

Shellye Godell, Graduate Student, Brigham Young University, Provo, Utah, U.S.A.

Maria S. Gomez, Laboratori de Parasitologia, Universitat de Barcelona, Barcelona, Spain

Ricardo Guerrero, Department of Biology, University of Caracas, Caracas, Venezuela

Frederick J. Harrison (R. Thomas), U.S. Army Center for Health Promotion and Preventive Medicine, Fort Lewis, Washington, U.S.A.

Menna Jones and B. Lazenby, University of Tasmania, Tasmania, Australia

Boris Krasnov, Ramon Science Center, Ben-Gurion University of the Negev, Mizpe Ramon, Israel

James Kucera, Murray, Utah, U.S.A.

Juha Laakkonen, Department of Biology, University of California at San Diego, La Jolla, California, U.S.A.

Robert E. Lewis, Iowa State University, Ames, Iowa, U.S.A.

Pedro M. Linardi, Departmento de Parasitologia, Universidade Federal de Minas Gerais, Belo Horizonte/Minas Gerais, Brazil

Javier Lucientes, Departamento de Patologia Animal, Facultad de Veterinaria, Universidad de Zaragoza, SPAIN

Luliang and Guo Tianyu, Department of Vector Biology and Control, Institute of Microbiology and Epidemiology, Beijing, China

Anthony Maddock, KwaZulu-Natal Nature Conservation Service, South Africa

Tom Manning and Sam Gilman, Department of Forest Service, Oregon State University, Corvallis, Oregon, U.S.A.

Sergeij G. Medvedev, Zoological Institute, Russian Academy of Science, Saint-Petersburg, Russian

Michael Patrick and Michael Gannon, Department of Biology, The Pennsylvania State University, Altoona, Pennsylvania, U.S.A.

Mary Peacock, Biological Resources Research Center, Department of Biology,University of Nevada, Reno, Nevada, U.S.A.

Stephen Petersen, University of Alberta, Edmonton, Alberta, Canada

R.L.C. Pilgrim & Andrea Booth, Department of Zoology, University of Canterbury, Christchurch, New Zealand

Hugo A. Ruiz PiÔa, Laboratorio de Parasitologia, Merida, Yucatan, Mexico

Duke Rogers, Department of Zoology, Brigham Young University, Provo, Utah, U.S.A.

Jerrold J. Scharninghausen, College Station, Texas, U.S.A.

Mikal Stanko, Institute of Zoology and Ecosozology of the Slovak Academy of Sciences, Department of Agricultural Landscape Ecology, Koëice, The Slovak Republic

Paul Stapp, Department of Environmental Sciences and Policy, University of California, Davis, Davis, California, U.S.A.

Andreij Tschabowsky, Svertzow Institute of Ecology and Evolution, Leninsky Prospeckt 33, Moscow 119071, Russia

Craig White, Graduate Student, Brigham Young University, Provo, Utah, U.S.A.

Dr. Kathrin Worschech, Naturkundemuseum Altenburg, Germany

Dr. Matthias Kiefer, Muenchen, Germany