I certify that I have read this study and that in my opinion it 



:ion and is ft 

 :he degree of 



conforms to acceptable standards of scholarly oresentation and is fully 

 adequate, in scope and quality, as a dis^ertat]/ori for thi 



Doctor of Philosophy. 



)r. D. R. Minnick, Chairman 

 Associate Professor of Entomology 



I certify that I have read this study and that in my opinion it 

 conforms to acceptable standards of scholarly presentation and is fully 

 adequate, in scope and quality, as a dissertation for the degree of 

 Doctor of Philosophy, 



Dr. C/W. 

 Asscrtiate 



Professo*^ of Entomology 



I certify that I have read th 

 conforms to acceptable standards of 

 adequate, in scope and quality, as 

 Doctor of Philosophy. 



bhat in my opinion it 

 iresentation and 1s fully 

 :iorKf{jr Ahe degree of 



Dr. F. A 

 Assists 



inson 

 •rcfessor of Entomology 



I certify that I have read this study and that in my opinion it 

 conforms to acceptable standards of scholarly presentation and is fully 

 adequate, in scope and quality, as a dissertation for the degr<?e of 

 Doctor of Philosophy. 



Dr. L. C. 

 Professor 



Kuitert 

 Emeritus of 



Entomology 



