CONTENTS 



PAGE 



Introduction ^^ 



History 6 



Dispersion 6 



Distribution 6 



Systematic position 7 



Economic importance 7 



Hosts 8 



Methods of study 8 



Life history 9 



The egg 9 



Incubation period 10 



The larva 11 



Description 11 



Feeding habits 11 



Length of period 13 



Description 14 



Pupation 14 



Construction of cocoon 15 



The pupa 16 



Transformation 16 



Description ,1'^ 



Duration of pupal stage ,■ 1'? 



Adults 18 



Description 18 



Emergence 19 



Duration of life 19 



Proportion of sex 19 



Habits 21 



Period between emergence and copulation 31 



Life of unmated females 22 



Mating , ^3 



Age at beginning of oviposition 33 



Process of oviposition *'^ 



24- 

 Time of oviposition . ., 



Habits during oviposition "* 



• • 3-i 



Period of oviposition 



