507. 73 



BULLETIN 



OF THE 



ILLINOIS STATE LABORATORY 



OF 



NATURAL HISTORY 



Urbana, Illinois, U. S. A. 



VOLUME VI. 



iyOl-1903 



Contributions to the Natural History Survey of Illinois, 

 made under the direction of 



S. A. Forbes 



Gazette Press 



Champaign, Illinois 



1903 



