NEW SPECIES OF DOLICHOPODID^ FROM 

 THE UNITED STATES. 



BY WILLIAM MORTON WHEELER. 



Plates I-IV. 



The species of Dolichopodidse described as new in the 

 following paper were in great part collected on three dif- 

 ferent expeditions to the West: one to Wyoming during 

 August and September, 1895, one to Central California 

 (Monterey and vicinity) during July and August, 1896, and 

 another to Southern California (San Diego and vicinity) 

 from December to April, 1897. The seasons available for 

 these expeditions were, unfortunately, not the most favor- 

 able — the best months for collecting being July in Wyo- 

 ming, and April and May in California — so that the species 

 described from my own collecting must represent only 

 an inconsiderable fragment of the Western Dolichopodid 

 fauna. In addition to this material, I have had several 

 interesting species from South Dakota, Idaho and Wash- 

 ington, generously sent me by Professor J. M. Aldrich, 

 and Mr. C. W. Johnson has kindly furnished me with 

 some valuable material from Florida, New Jersey and 

 Pennsylvania. 



Only the smaller genera of Dolichopodidas are considered 

 in the present paper, since the larger genera, like Doli- 

 chopus, Gymnofternus and Psilofus deserve special treat- 

 ment and a more careful and extensive study than I have 

 been able to give them. Only three new genera are added 

 to our North American fauna. One of these, Teucho- 

 fhorus, though known from Europe, has not before been 

 recognized in this country. Two other genera, Nothosym- 

 ■pycnus and Parasyntormon are established for the accom- 

 modation of groups of species allied to Syntormon and 



[i] Sept. 12, 1899. 



