CONTENTS. 



Page. 



Introduction 1 



De.-icription of the species 1 



Genus Toxoptera Koch 8 



Key to the genus 8 



Distribution of Toxoptera muhlenbergise 9 



Feeding habits 9 



Host plants 9 



Life history 9 



Continuous-generation experiments 9 



Molting 13 



Fecundity of the summer forms 13 



Age when individuals begin reproducing 13 



' Length of life of the viviparous forms 13 



The sexes 13 



Place of oviposition '. 14 



Fecundity of the oviparous females 14 



Mortality of eggs , 15 



Rearing methods 15 



III 



