Dr. Roy Chapman Andrews, Director of the American Museum of 
Natural History; Dr. W. Reid Blair, Director of the New York Zoological 
Park; F. W. Bond of the Zoological Society of London; Dr. C. M. Breder, Jr., 
Director of the New York Aquarium; Walter H. Chute, Director of the 
John G. Shedd Aquarium of Chicago; Dr. P. E. P. Deraniyagala of the 
Colombo Museum, Ceylon; Henry E. Ditzel, Advertising Manager of Sharp 
and Dohme; George L. Dowden of San Gabriel, California; Dr. Howard 
K. Gloyd, Director of the Lincoln Park Zoological Gardens in Chicago; 
Dr. H. Hediger of the Naturhistorisches Museum, Basel, Switzerland; W. 
Lincoln Highton, photographer, Works Progress Administration; Carl Kauf- 
feld, Curator of Reptiles, Staten Island Zoological Society; L. M. Klauber, 
President, American Society of Ichthyologists and Herpetologists; Henry R. 
Luce, Editor, Time and Life; Dr. William M. Mann, Director of the National 
Zoological Park; E. A. Mcllhenny of Avery Island, Louisiana; Hans Stecher, 
Curator of Reptiles of the Staten Island Museum of Arts and Sciences; Carol 
Stryker, Director of the Staten Island Zoological Society; C. V. M. Sutcliffe, 
of the faculty of Oglethorpe University; and Gifford Wood, Advertising 
Manager of Becton, Dickinson. 
Some photographs were made in a few of the foregoing institutions 
by members of the Federal Writers’ Project. In such instances the institu¬ 
tion’s initials appear under the illustration: (CPM)—Central Park Me¬ 
nagerie, (NYA)—New York Aquarium, (NYZP)—New York Zoological 
Park, (NZP)—National Zoological Park, (SIZ)—Staten Island Zoo. 
We are especially grateful to those well-known naturalists and herpe¬ 
tologists, Dr. Raymond L. Ditmars, Curator of Mammals and Reptiles of 
the New York Zoological Park, and Clifford H. Pope, one-time Assistant 
Curator of Herpetology of the American Museum of Natural History, who 
undertook to read and check our manuscript. Their many authoritative sug¬ 
gestions and comments have been incorporated in the printed text. 
IX 
