TWO-WINGED FLIES OF THE GENERA DOLICHOPUS 

 AND HYDROPHORUS COLLECTED IN ALASKA IN 1921, 

 WITH NEW SPECIES OF DOLICHOPUS FROM NORTH 

 AMERICA AND HAWAII. 



By J. M. Aldrich, 



Associate Curator, Division of Insects, United States National Museum. 



The present paper is a report on the material in the genera DoU- 

 chopus and Hydrophorus, of the Dipterous family Dolichopodidae, 

 collected by the writer in Alaska during June and July, 1921 ; it also 

 contains additional new species of Dolichopus from Labrador, the 

 United States, and Hawaii. 



Among the localities cited are Camps 327 and 334 ; these are tem- 

 porary names for points on the Government railroad in Alaska, the 

 numbers indicating the miles from Seward at the south end; they 

 are both in the south edge of the Yukon Basin, on the Nenana River, 

 in a canyon between mountains. Healy is 358 miles from Seward. 



Camp 334 has lately been given the permanent name of Carlo, and 

 Camp 327 that of Windy, as sidings on the railroad. 



Genus DOLICHOPUS Latreille. 



Dolichopus Latreille, Prgcis des Caracteres G§neriques des Insectes, Paris. 

 1796, p. 159.— LoEW, Smiths, Misc. Colls., No. 171, pp. 18. 323, 1864.— 

 Feey, Acta Societatis pro Fauna et Flora Feunica, vol. 40, No. 5, pp. 1-27, 

 1915.— Becker, Nova Acta, vol. 102, part 2. pp. 126-180, 1921.— Van 

 DuzEE, Cole, and Aldrich, Bulletin 116, U. S. Nat. Mus., 1921, 304 pp., 

 16 plates. 



In spite of the fact that 218 species of this remarkable genus are 

 described for North America in Bulletin 116 just cited, my work in 

 Alaska yielded 5 new species and 2 European not previously known 

 from North America ; while 15 previously described North American 

 species were also collected, of which 8 had never been reported from 

 Alaska. 



DOLICHOPUS MANICULA Van Duzee, Cole, and Aldrich. 



Dolichopus manicula Van Duzee, Cole, and Aldrich, Bull. 116, U. S. Nat. 

 Mus., p. 56. 

 Fourteen specimens, Skagway, Alaska. Originally described from 

 high altitudes in Colorado, New Mexico, and Wyoming. 



No. 2446— Proceedings U. S. National Museum, Vol. 61, Art. 25 



