ANNALS 



OF 



The Entomological Society of America 



Volume VI SEPTEMBER, 1913 Number 3 



A REVISION OF THE SPECIES IN AGROMYZA FALLEN, 

 AND CERODONTHA RONDANI. (DIPTERA). 



By J. R. Malloch. 

 Assistant, Cereal and Forage Insect Investigations, Bureau of Entomology. 



The work on the two genera presented in this paper has 

 been undertaken for the purpose of deciding the identity and 

 distinctions of several species affecting field and forage crops, 

 upon which considerable work has been done by the field agents 

 of the division dealing with the insects affecting these crops. 

 In some cases it has been found necessary to change the names 

 of certain American species, as examination has proved 

 that they are either synonymous with other American species 

 or with species belonging to the European fauna. In the case 

 of some other species it may at some future time become 

 necessary to sink the American species as synonymous with 

 European forms, but owing to the most unsatisfactory con- 

 dition of the knowledge of the species contained in this family 

 (Agromyzidae) in Europe, it is not possible to definitely decide 

 upon the correct names of their species from the brief de- 

 scriptions available. Thus, while I suspect the distinctness 

 of certain species in our fauna from others occurring in Europe, 

 I consider it the safer plan, and one entailing no material 

 disadvantages, to retain those species in our list, rather than 

 rank them as synonyms of species which may ultimately 

 prove to be absent from our fauna. 



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