vi Fleas of Eastern United States 



Quarantine, the writer expresses his sincere appreciation not 

 only for their kindness in lending material and offering records, 

 but also in making desk space available for long periods. 

 Thanks for permission to examine collections and use records 

 are also due Dr. Karl Jordan, of the Tring Museum; Dr. R. L. 

 Roudabush, of Ward's Natural Science Establishment; Dr. E. R. 

 Becker and Mr. Thomas G. Scott, of Iowa State College; Dr. 

 M. A. Stewart, of the University of California; Dr. H. H. Ross, 

 of the Illinois Natural History Survey, and Dr. H. E. Jaques, 

 of Iowa Wesleyan College. For technical advice and continu- 

 ous encouragement, the writer is deeply indebted to Dr. H. H. 

 Knight, of Iowa State College, under whose direction the work 

 was done. 



