THE 



KANSAS UNIVERSITY 

 SCIENCE BULLETIN 



Vol. XI— DECEMBER. 1919. 



(Whole Series, Vol. XXI, No. IT.) 



ENTOMOLOGY NUMBER. 



CONTENTS: 



The Biology and Ecology of Aqu.\tic and Semiaquatic Hemiptera, 



H. B. Hungerford. 



The Male Genitalia as Characters of Specific Value in Certain 



Cryptocerata (Hemiptera-Heteroptera), H. B. Hungerford. 



PUBLISHED BY THE UNIVERSITY 

 LAWRENCE, KAN. 



Entered at the post oflice in Lawrence as second-class matter. 



8-1669 



