TABLE OF CONTENTS 



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Preface . . • . 



Table of Contents .... 

 On the Terminology of Diptera 



Sketch of the Systematic Arrangement of Dipteea 

 I. Nemocera 

 II. Brachycera 

 III. Coriacea 



On the North American Trypetidae 



1. Extent of the family 



2. Its division into Trypetina and Dacina 



3. Its natural character 



4. Its relationship . 



5. North American species hitherto recorded 



6. Systematic arrangement of the species described, with 



their synopsis 



7. Description of the species 

 Appendix I 

 Appendix II 

 Appendix III . . . 



On the North American Sciomyzidae 



On the North American Ephydrinidae 

 Notiphilina 

 Hydrellina 

 Ephydrina 



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v 



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5 

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129 

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 158 



