CONTENTS 



PAGB 



Introduction xv 



CHAPTER I 



Zoological Position, Life History, and Habits i 



Life History 6 



The Egg , . . . i8 



The Larva 19 



The Pupa and Puparium 23 



Emergence of the Adult 25 



Structure of the Adult 2^] 



Difference in Size of Adults 32 



Summary of Duration of Life Round . . 35 



Number of Generations 36 



Possibilities in the Way of Numbers . . 37 

 Number by Actual Count in Relation to 



Quantity of Food 39 



Hibernation 41 



Habits of the Adult Fly 44 



Do Flies have a Color Preference? ... 47 



Fly-Specks 48 



Distance of Flight 51 



Marking Flies for Experiment .... 56 



Length of Life of the Adult 58 



Time Elapsing between the Issuing of the 



Adult and the Period of Sexual Maturity 60 



V 



