TABLE OF CONTEXTS. 



PAGE 



Advertisement ... . iv 



Preface ........ v 



Table of Contents ....... ix 



Ou the Terminology of Diptera . . . xi 



SKETCH OF THE SYSTEMATIC ARRANGEMENT OF DIPTEKA . 1 



I. Neiuocera ...... 5 



II. Brachycera ..... 15 



III. Coriacea .... 48 



Ox THE NORTH AMERICAN TRYPETIDAE 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 . ] 03 



ON THE NORTH AMERICAN EPHYDRINIDAE . . . 129 



Notiphiliua ... . . 131 



Hydrellina . ... 149 



Ephydrina . . . - . 158 



