1. Department of Biological Sciences, The University of Texas at El Paso, El Paso, TX 79968, USA.
2. Biodiversity Collections, The University of Texas at El Paso, El Paso, TX 79968, USA.
3. Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN 37996, USA.
4. Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA.
5. Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138, USA.
6. Museu de Zoologia da Universidade de São Paulo, 04263-000 Ipiranga, São Paulo, SP, Brazil.
7. Department of Natural History, Royal Ontario Museum, Toronto, Ontario M5S2C6, Canada.
8. Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S3B2, Canada.
9. Department of Ornithology, American Museum of Natural History, New York, NY 10024, USA.
10. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá 111321, Colombia.
11. Department of Ecology and Evolutionary Biology, Tulane University, LA 70118, USA.
12. Museum of Natural Science, Louisiana State University, Baton Rouge, LA 70803, USA.
13. Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA.
14. Instituto de Zoología y Ecología Tropical, Universidad Central de Venezuela, Caracas, Venezuela.
15. Colección Ornitológica Phelps, Caracas, Venezuela.
16. Biodiversity Institute, University of Kansas, Lawrence, KS 66045, USA.
17. Finnish Museum of Natural History, University of Helsinki, 00014, Helsinki, Finland.
18. Department of Zoology, Museu Paraense Emílio Goeldi, CP 399, 66040-170 Belém, PA, Brazil.
19. US Geological Survey, Patuxent Wildlife Research Center, Laurel, MD 20708, USA.
20. National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA.