TABLE OF CONTEXTS. 



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Preface ..... 



Table of Contents .... 

 On the Terminology of Diptera 



Sketch of the Systematic Arrangement of Diptera 

 I. Nemocera 

 II. Brachycera 

 III. Coriacea 



On the North American Trypetidae 



1. Extent of the family 



2. Its division into Tnjpetina and 



3. Its natural character 



4. Its relationship . 



5. North American species hitherto 



6. Systematic arrangement of the 



their synopsis 



7. Description of the species 

 Appendix I 



Appendix II 

 Appendix III 



Dae 



recorded 

 species described, with 



On the North American Sciomyzidae 



On the North American Ephydrinidae 

 Notiphilina 

 Hydrellina 

 Ephydrina 



IX 



xi 



1 



5 

 15 



4S 



49 

 49 

 51 

 52 

 5G 

 57 



61 

 64 

 91 

 94 

 99 



103 



129 

 131 

 14:) 

 158 



