22 DIPTERA OF NORTH AMERICA. [PART III. 



lomydse. Their relationship with the Ortalidae is evident 

 Among the genera which Macquart places in one family with 

 them, Eurina and Platycephala belong to the Oscinidse, each 

 of the others to some other dipterous family ; none shows any 

 close relationship to the Ortalidae. In the Dipteres Exotiques 

 Macquart has in part corrected this error, as at least Oxycephala, 

 of the identity of which with Pyrgota he was not aware, is put 

 among the Ortalidse. 



A second error is that the ortalideous genus Stenopterina 

 (Macquart incorrectly writes Senopterina) has been placed in 

 his family Tephritidx. In the Dipteres Exotiques Macquart 

 has amended this error. 



A third mistake consists in Macquart having placed in his 

 genus Urophora several species which do not at all belong to his 

 family Tephritidx; his Urophora quadrivittata, fulvifrons, and 

 several others, are true Ortalidae. 



Fourthly, the position of the genera Cephalia and Michogaster 

 (better Mischogastra, or at least Mischogaster) among the Sep- 

 sidee cannot be sustained. As has been observed already, we 

 agree with Rob. Desvoidy in considering both as true Ortalidse 

 on account of the large development of the palpi as well as of 

 the structure of the ovipositor. 



Neither can I, in the fifth place, agree with Macquart in put- 

 ting Setellia among his Leptopodidse ; I refer it also to the Or- 

 talidae, and this once more in agreement with Rob. Desvoidy. 



A sixth error is the great interval between Ulidia and the 

 other Ortalidae, as well as the whole composition of the family 

 Ulidini. Lipara, with which Macquart's genus Gymnopoda is 

 synonymous, belongs to the Oscinidae; Ccelopa and Actora do 

 not belong to the same family, neither with Lipara, nor with 

 Ulidia, nor together. In the Dipteres Exotiques Macquart did 

 rightly in dropping altogether the ill-conceived family of Ulidinse. 



I will not expatiate here on the incorrectness of the position 

 of Palloptera, Toxoneura, Lonchaea, and Teremyia (established 

 for Lonchsea laticornis), as this inquiry is of no especial im- 

 portance to us. 



It is easy to perceive that the system is improved in the Dip- 

 teres Exotiques ; but even here Dorycera is misplaced among 

 the Psilomydse, together with Eumetopia (which belongs to the 

 Ortalidse). 



