CONTENTS, 



Studies on a New Species of Toxoptera, with an Analytical Key to the 



Genus and Notes on Rearing Methods. Page. 



W. J. Phillips and J. J. Davis. . 1 



Introduction 1 



Description of the species 1 



Genus Toxoptera Koch 8 



Key to the genus 8 



Distribution of Toxoptera muhlenhergix 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 



The Yellow Clover Aphis /. /. Davis. . 17 



Introduction 17 



Synonymy 17 



Generic position 18 



Distribution 18 



In America 18 



In Asia 19 



Food 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 



Life history and habits 26 



Methods of study 26 



Generation experiments 27 



Molting 38 



Fecundity in relation to other species 38 



Natural enemies 39 



Bibliography 40 



Index 41 



III 



