CONTENTS OF VOLUME XI. 



PA(iF. 



Xo. 1. — The Biology and Ecology of Aquatic and Semiaquatic Hemiptera. 



Plates Tto XXX. By H. B. Hungerford 3 



No. 2. — The Male Genitalia as Characters of Specific Value in Certain 

 Cryptocerata (Hemiptera-Heteroptera). Plates XXXI to 

 XXXII. By H. B. Ilungerford 329 



