6 CONTENTS. 
Page. 
Insects that are mistaken for chinch bugs 64 
Probable origin and diffusion of the chinch bug 66 
Indications of a probable distant origin and later diffusion 67 
Unique appearance and gregarious habit 68 
Occurrence of the long-and short winged forms and their distribution 69 
Relation of the inland and seacoast short-winged forms 71 
Probable course of diffusion 71 
Habits of the European species, Blissus dorm Ferr 75 
Previous ideas on the diffusion of the chinch bug 78 
Reasons for the present theory of diffusion 80 
