TABLE OF CONTENTS. 



THE FAMILY OETALIDiE. 

 PART FIRST.— INTRODUCTION. 



PAGE 



The European OrtalidjE . 2 



Meigen's genus Ortalis ........ 2 



1. Characters which Meigen's species of Ortalis have in 



common . . . . . . . . .2 



2. Species erroneously placed in the genus Ortalis . . 3 



The other European Ortalidae ....... 4 



1. Forms resembling Ortalis lamed ..... 5 



2. Forms resembling Ortalis syngenesis .... 6 



3. Forms resembling Ortalis pallidum . . . 7 



4. Forms not resembling any of Meigen's species . . 8 



Aciphorea not belonging to the Ortalidae ..... 8 



Summary of the European Ortalidse ..... 10 



The Ortalidje other than European " . 11 



a. In Wiedemann 11 



6. In Rob. Desvoidy 15 



c. In Macquart ......... 19 



d. In Walker 26 



e. In Bigot, Gerstsecker, Doleschall, and Saunders ... 27 



Natural characters of the family Ortalidje .... 28 



Relationship of the Ortalidae . . . . . .30 



Diagnostic or artificial definition of the Ortalid.® . ... 31 



(in) 



