1. Division of Vertebrates (Herpetology), American Museum of Natural History, 200 Central Park West, New York, New York 10024.
2. Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, Missouri 64110.
3. Department of Biology, Regis University, Denver, Colorado 80221.
4. Department of Biology, Hanns-Dieter-Hüsch-Weg 15, Johannes Gutenberg University, 55128 Mainz, Germany.