J. R. MALLOt'II 227 



FLIES OF THE ANTHOMYIID GENUS PHAONIA 

 ROBINEAU-DESVOIDY AND RELATED GENERA, KNOWN 

 TO OCCUR IN NORTH AMERICA 



BY J. R. MALLOCH 



The present paper offers a revision of the species of the genus 

 Phaonia in its widest sense, not with the idea that this is by any 

 means a complete survey of our species, because there must be 

 a large number still unknown to me, but with the intention of 

 making it possible for students of this imperfectly known family 

 to identify those species which have already been described, and 

 to place before those students data bearing on characters which 

 I have found valuable in the differentiation of the species. To 

 this family, more so than to most dipterous groups, there has been 

 shown an aversion by students, because of the fact that the gen- 

 eric limits and the characters for the definition of the genera have 

 been but imperfectly understood. There is no good key for 

 the identification of the genera, though a recent one by Herr P. 

 Stein is a considerable advance in our knowledge.^ 



In several of my recent papers on different genera of the family 

 I have given partial keys to the genera and intend finallj' to 

 publish a key to the whole of the genera, but my material is 

 not sufficient to warrant such a course at this time. I include 

 in this paper a partial key to the genera related to Phaonia in 

 the restricted sense, in the hope that it may permit of the more 

 ready recognition of the forms treated in the paper. 



Much of the material on which this paper is based belongs to 

 the United States National Museum, but many specimens were 

 lent to me by Mr. C. W. Johnson from his collection or that of 

 the Boston Society of Natural History, and by Professor J. S. 

 Hine from his own collection or from the material collected by 

 him when on his trips to Mt. Katmai for the National Geographic 

 Society. The collection of the lUinois State Natural History 

 Society has always been available to me, and most of that mate- 

 rial was collected by the late Mr. C. A. Hart and the author. 



» Archiv. fiir Xaturges., 1917, Abt. A, 1 heft, 1919. 



TRAXS. AM. EXT. SOC, XLVIII. 



