212 REVIEW OF NORTH AMERICAN TRYPETINA. 



by other authors (an account of them may be found in Mono- 

 graphs, etc., Part I, p. 49-51), seemed to me so ill conceived, 

 that I did not feel inclined to adopt them as a basis for further 

 development. 1 perceived, on the contrary, that any attempt to 

 subdivide exotic Trypetid® must be preceded by a rational 

 systematic distribution of the more abundant material of the 

 European species. In 1862, in my monograph of the European 

 Trypetidas, I divided the Trypetina into twenty subgenera : 

 Platyparea, Euphranta, Aciura, Hemilea, Anomoea, Acidia, 

 Spilographa, Zonosema, Ehagoletis, Rhacochlsena, Tmjpeta, En- 

 sina, Myosites, Urophora, Sphenella Carphotricha, Oxyphora, 

 Oxyna, Tephritis, and Urellia. The definitions of these groups 

 will be found in the above-quoted work. To these must be 

 added : Bypenidium (established by me since, in the Berliner 

 Entom. Zeitschr., VI, p. 87), Orellia (separated by Schiner, in 

 his Fauna Austriaca, from Oedaspns) and Chetostoma (estab- 

 lished by Rondani, in his Prodromus, Vol. I). Such is the pre- 

 sent state of the classification of the European Trypetina, upon 

 which the distribution of the known North American species is 

 to be based. Considerable as the number of the latter is, it is 

 certain at the same time that this number does not reach one- 

 fifth, perhaps not one-tenth, of all the existing North American 

 Trypetina. Any attempt at a distribution, therefore, would 

 probably be modified by further discoveries. In this dilemma, 

 the course I adopted was, to append to the description of each 

 species the necessary remarks on its systematic position, and to 

 give a general survey of all the results thus obtained, at the end 

 of the volume. 



Detailed descriptions of those species only are given here, 

 which are not described in Monographs, etc., Part I, or the 

 descriptions of which were insufficient. The descriptions con- 

 tained in that volume are indicated by references ; the diagnoses, 

 however, even of those older species are reproduced here, with 

 the modifications rendered necessary by the addition of the new 

 species. 



An important defect of the present publication is, that a con- 

 siderable number of the new species are not represented on the 

 plates. The reason is, that the plates were prepared more than 

 four years ago, at a time when the number of the known North 

 American species was not sufficient to fill the required number 



