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ACKNOWLEDGMENTS 



OOj Many people have assisted, advised, and encouraged me 



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in my graduate studies. I am deeply grateful to the members 



of my graduate committee, Drs. Donald W. Hall, Clifford S. 

 Lofgren, Edward M. Hoffman, and Robert C. Wilkinson, for 

 their patience and guidance, and for the time and effort 

 they have spent on my behalf. I also wish to thank Dr. 

 George E. Allen, who served as chairman of the graduate 

 committee before his departure from the University for 

 another position. 



In addition to the members of my graduate committee, 

 several people have given me invaluable assistance. Fore- 

 most among these is Ms. E. Ann Ellis, Electron Microscopist 

 at the Insects Affecting Man and Animals Research Laboratory, 

 USDA, Gainesville. Mr. John D. Atwood, Mrs. Anita Lemire , 

 Mrs. Susan W. Avery, and Dr. Albert Undeen have also helped 

 me in various ways. Dr. William F. Buren of the University 

 of Florida encouraged me over a long period of time. 



I cannot adequately express my gratitude to my wife, 

 Judy, for her unfailing encouragement and patience throughout 

 my graduate studies. 



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