STATE OF ILLINOIS 

 DwiGHT H. Green, Go<vcrnor 



DEPARTMENT OF REGISTRATION AND EDUCATION 

 Frank G. Thompson, Director 



NATURAL HISTORY SURVEY DIVISION 

 Leo R. Tehon, Acting Chief 



Illinois Natural History Survey 



BULLETIN 



Volume 23 



Printed by Authority of the State of Illinois 



URBANA, ILLINOIS 

 1944-1945 



