ORTALIDJE — INTRODUCTION. 19 



Chlorophora may also belong there, as Rob. Desvoidy espe- 

 cially mentions its relationship to Setellia. 



The following among Rob. Desvoidy's genera belong there- 

 fore to the Ortalidse : Dichromyia, Palpomyia, Hesyquillia, 

 Heramyia, 3lyo?-is, Oscinis, Blainvillia, Meckelia, Melieria, 

 Myennis, Delphinia, Myrmecomyia, Polistoides, Herina, Myo- 

 dina, Richardia, liivellia, Boisduvallia. Very probably Se- 

 tellia and Chlorophora have to be added to them. The syste- 

 matic position of Stylophora is doubtful. Genera not belonging 

 to the Ortalidse are : Straussia, Vidalia, Acidia, Clidonia. 



(c.) In Macquai't. 



During his long career as an entomological writer, Macquart 

 has several times changed his views with regai'd to the classifi- 

 cation of the Diptera acalyptera, as was to be expected from 

 the great difficulty of the subject. His opinion, however, on 

 the extent of the family Ortalidse has, during that time, under- 

 gone but little change. As, strictly speaking, he is the only 

 writer who has attempted to establish a general system of the 

 diptera, embracing all parts of the world, I consider it as my 

 duty to give a detailed account of his views, the more so as they 

 differ from mine in a not unimportant manner. To attain this 

 end I will enumerate all those of his families, with their genera, 

 which, according to my opinion, contain genera belonging to the 

 Ortalidse, as well as to the families closely connected with them, 

 for instance, Palloptera, Toxoneura, Lonchsea. In order to 

 show the progress made by Macquart during his dipterological 

 studies I will give this in a twofold manner, that is, first after 

 the Suites & Buffon and next after the Dipteres Exotiques. 

 Those genera which I consider as undoubtedly Ortalideous I 

 have marked with an exclamation ; those doubtfully introduced 

 into this family I have designated by an interrogation. The 

 genera related to the Ortalidse, which I have united in the 

 family Pallopleridse, I have inclosed in brackets ; the same I 

 have done with the genus Sapromyza, because Macquart does 

 not separate the species of Palloptera from the Sapromyzse, 

 although the typical Sapromyzse have no relationship whatever 

 with the Ortalidse. 



The review of the part of the system above alluded to, from 

 the Suites & Buffon, is as follows : — 



