BULLETIN 



DEC 30 1897 



OF THE 



'10 



[llinois ^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. 



