— 
THE 
KANSAS UNIVERSITY 
SCIENCE BULLETIN 
VoL. XI—DECEMBER, 1919. 
(Whole Series, Vol. XXI, No. 17.) 
ENTOMOLOGY NUMBER. 
CONTENTS: 
THE BIOLOGY AND ECOLOGY OF AQUATIC 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 office in Lawrence as second-class matter. 
8-1669 
