TABLE OF CONTENTS, 



PAGE 



Advertisement ...'.. iv 



Preface ..... . y 



Table of Contents ... . . ix 



On the Terminology of Diptera . . si 



SKETCH OF THE SYSTEMATIC ARRANGEMENT OF DIPTERA . . 1 



I. Nemocera ... 5 



II. Brachycera . 15 



III. Coriacea . . . 48 



ON THE NORTH AMERICAN TRYPETIDAE . . 49 



1. Extent of the family . .49 



* 



2. Its division into Trypetina and Dacl/ia . 51 



3. Its natural character .... 52 



4. Its relationship ... .56 



5. North American species hitherto recorded . 57 



6. Systematic arrangement of the species described, with 



their synopsis ..... 61 



7. Description of the species . 64 

 Appendix I ... .91 

 Appendix II .. . . 94 

 Appendix III ... 99 



ON THE NORTH AMERICAN SCIOMYZIDAE . 103 



ON THE NORTH AMERICAN EPHYDRINIDAE . 129 



Notiphilina . . . 131 



Hydrellina . . . 149 



Ephydrina . . . 158 



