BULLETIN 



OF THE 



[llinois 3 tate Laboratory 



OK 



NATURAL HISTORY, 



Urbana, Illinois 



VOLUME V. 



ARTICLE III.— THE NORTH AMERICAN SPECIES OF 



DIAPTOMUS. 



By FREDERICK WILLIAM SCHACHT, B. S. 



Illinois State Laboratory of Natural History, 

 URBANA, ILLINOIS, 



1897. 



