INTRODUCTION. 23 



In his family Tephritidse the genus Odontomera is established, 

 which is closely related to Ccelometopia on one side and Setellia 

 on the other, and must therefore be transferred to the Ortalidse. 



The same may be said of the genus Meracantha, the true 

 place of which is in the vicinity of Odontomera, Setellia, Coslo- 

 metopia, Richardia, etc. 



The genus Toxura, judging from the published figure, also 

 belongs to the Ortalidse, and indeed in the circle of relationship 

 of Pyrgota; whether the examination of the insect itself would 

 lead to the same result I do not pretend to affirm, as I have not 

 seen it. 



The figure of the head of Epicerella {Dipt. Exot., Suppl. iv., 

 Tab. xxvii.) might perhaps justify the supposition that the genus 

 belongs to the -Ortalidse; nevertheless I think it more probable 

 either that the frontal bristles, characteristic of the Trypetidse, 

 were broken off in Macquart's specimen, or that they have been 

 omitted in the drawing. Thus I do not dare to express any 

 opinion as to the correctness of the position assigned by Mac- 

 quart to this genus. 



Cephalia, in the Dipteres Exotiques, is likewise put among 

 the Sepsidas instead of among the Ortalidse, 



Omalocephala (better Homalocephala, at all events, a preoc- 

 cupied name) seems to belong in the vicinity of Setellia, Ccelo- 

 metopia, etc., that is, in the family Ortalidse. 



The genus Conopsidea, as Macquart informs us, is founded 

 upon Cephalia femoralis Wied. ; in the Suites a Buffon, this 

 same and two more species gave him occasion to establish the 

 genus Michogaster. If these two data be correct, as we have 

 every reason to suppose, Conopsidea would be a synonym of 

 Michogaster; the emendation of the incorrectly formed name 

 Conopsidea thus becomes useless. 



The erroneous location of Setellia at the end of the Leptopo- 

 ditse is preserved. 



Ulidia is transferred to the family Lauxanidse, where it is a 

 perfect stranger. 



About the systematic position of Zygothrica (not Zygotricha, 

 as Gray, in the Animal Kingdom, spoils, in trying to improve it), 

 a genus already proposed by Wiedemann in his essay on Achias, 

 I can only form an opinion from the statement^ of Wiedemann 

 and Macquart on the typical species, Z. dispar, as well as from 



