CONTENTS. 



Page. 



I nl rod net ion 17 



Synonymy 17 



Generic position 18 



I )istribution 18 



In America 18 



In Asia 19 



I'ood plants 19 



Descriptions •. 20 



Wingless stem-mother 20 



Winged viviparous female 21 



Wingless viviparous female 23 



Winged male 23 



Wingless oviparous female 25 



Egg 26 



I iife history and habits 26 



Methods of study 26 



Generation experiments : 27 



Moiling 38 



Fecundity in rclal ion to other species , 38 



Natural enemies ' 39 



13ibliograi)hy 40 



ni 



