TABLE OF CONTENTS. 



Advertisement ... . 



Preface . . . . , . v 



Table of Contents .... . . ix 



On the Terminology of Diptera . . . xi 



SKETCH OF THE SYSTEMATIC ARRANGEMENT OF DIPTERA . . 1 



I. Nemocera ...... 5 



II. Brachycera ...... 15 



III. Coriacea . . . . . .48 



* 



ON THE NORTH AMERICAN THYPETIDAE . . . 49 



1. Extent of the family . . . . .49 



2. Its division into Trypetina and Dacina . . 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 . . . 1 03 



ON THB NORTH AMERICAN EPHYDBINIDAB . . . . 129 



Notiphilina . '* . . . . .131 



Hydrellina ...... 149 



Ephydrina . . . . . . 158 



