NEW GENERA AND SPECIES OF ACALYPTRATE FLIES 

 IN THE UNITED STATES NATIONAL MUSEUM 



By J. R. Malloch 



Of the United States Bureau of Biological Survey 



In this paper I present descriptions of new genera and species, 

 with some notes on genera and species ah-eady described, the rela- 

 tions and distribution of which are imperfectly known, in the fami- 

 lies Sapromyzidae, Drosophilidae, and Agromyzidae. 



All the type specimens are deposited in the United States National 

 Museum, and all species dealt with are from the New World. 



Family SAPROMYZIDAE 



The species of this family occurring in Central and South 

 America have not been critically studied in the light of recent 

 generic subdivisions of the family until now, and in the follow- 

 ing pages I attempt to place those species available to me in the 

 groups which I assigned the North American forms to in the recent 

 paper by W. L. McAtee and the writer. As recentl}^ as 1908 the 

 family was listed as containing 11 monobasic genera, 11 genera con- 

 taining from 2 to 8 species each, and one large genus with 413 spec- 

 ies. This last genus, Lauxania, was divided into 6 subgenera, 3 of 

 which were monobasic, one contained 2 species, the remaining species 

 being arbitrarily placed in the other two (67:341). Subsequently 

 Kertesz erected about half a dozen other monobasic genera for the 

 reception of Oriental species, Frey erected two for American species, 

 and the present writer has recently made a realignment of the genera 

 occurring in North America. In this last work one new monobasic 

 genus was erected and characters cited for the subdivision of the 

 heterogeneous group Lauxania of authors by means of which sev- 

 eral genera previously considered as synonyms were given generic 

 rank. Up to the present I have found no evidence in the examina- 

 tion of much exotic material that the segregations proposed on the 

 basis of the American forms are invalid. In fact, by the use of these 



No. 2622— Proceedings U. S. National Museum, Vol. 68, Art. 21 



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