Occasional Papers of the Museum of Zoology 



Acknowledgments 



This study would have been quite impossiljle without the 

 generous cooperation of numerous individuals and institutions 

 in the loaning of specimens, and the writer herewith takes 

 pleasure in recording his indebtedness to Dr. Thomas Barbour 

 of the Aluseum of Com{)arative Zoology, Air. D. C. Davies of 

 the Field Aluseum of Natural History, Mr. L. M. Klauber of 

 the vSan Diego Zoological Garden, Dr. G. K. Noble of the 

 American Museum of Natural History, Professor A. G. Ruth- 

 ven of the Museum of Zoology of the University of Michigan, 

 Professor J. O. Snyder of vStanford University. Dr. T,eonhard 

 Stejneger of the United States National ^Museum, ]\Ir. Tracy 

 I. Storer of the Museum of Vertebrate Zoology, Dr. John 

 Van Denburgh of the California Academy of Sciences (for 

 whom one of the new forms is named), Professor A. H. 

 Wright of Cornell University, and ]\Ir. L. E. Wyman of the 

 Los Angeles Museum of History, Science, and Art. 



