6 BULLETIN 15 4, UNITED STATES NATIONAL MUSEUM 



of packiiit;, iiivoicin<>:, and shipping enormous lots, a procedure that 

 is well nigh impossible in many cases. The assembling of data upon 

 many large series not previously studied, and upon many more not 

 previously correlated, has helped greately in working out the distri- 

 bution and generic relationships of the various forms. 



A total of 12,676 lizards have been examined during the progress 

 of this study, including 59 of the 86 types here assigned to the genus. 

 Forty of the 59 types in the American museums are in the collection 

 of the United States National Museum at Washington, and the rest 

 are scattered, but in the leading museums of the country. 



Faunal lists have been consulted extensively for records, and the 

 reports of each species^ if within the known range, have been ac- 

 cepted. In the following pages the detailed locality records are 

 given for each species. If the report is based on a publication, the 

 latter is cited just after the name of the locality. If specimens sup- 

 porting the record have been examined by the writer, the name of 

 the museum or museums holding them have been added in abbrevi- 

 ated form (see p. 8 for chart of abbreviations). Thus, at a glance 

 one may learn the basis for each report presented. 



It is a pleasure for the writer to avail himself of this opportunity 

 to extend his grateful acknowledgments to those institutions and 

 individuals who have cooperated with him in this study. He is par- 

 ticularly indebted to Dr. Frank N. Blanchard, under whose general 

 direction the work has been prepared, for helpful suggestions and 

 criticisms tendered during the preparation of the manuscript. This 

 bulletin, it may be added, forms one of the series of contributions 

 from the Zoological Laboratory of the University of Michigan. 



The authorities of all of the museums visited during the progress 

 of this enterprise have made their collections available for study 

 and have placed every facility at the writer's disposal. In this con- 

 nection his appreciation is extended to Dr. Leonhard Stejneger and 

 Miss Doris M. Cochran of the United States National Museum ; to 

 Dr. Barton W. Evermann and Mr. Joseph R. Slevin of the California 

 Academy of Sciences; to Dr. Thomas Barbour and Mr. Arthur 

 Loveridge of the Museum of Comparative Zoology; to Dr. G. K. 

 Noble and Mr. Clifford H. Pope of the American Museum of Natural 

 History; to Dr. Alexander G. Ruthven and :Mrs. Helen T. Gaige of 

 the Museum of Zoology of the University of jNIichigan ; to Mr. Karl 

 P. Schmidt of the Fieid Museum of Natural History ; to Mr. H. W. 

 Fowler of the Academy of Natural Sciences of Philadelphia ; to Dr. 

 Joseph Grinnell and Dr. Jean Lindsdale of the Museum of Verte- 

 brate Zoology of the University of California ; to Dr. J. O. Snyder 

 and Mr. G. S. Myers of the Stanford University Museum ; to Mr. 

 M. Graham Netting of the Carnegie Museum; to Mr. J. K. Strecker 

 of the Baylor University Museum; to Mr. L. M. Klauber of the 



