NOTES AND DESCRIPTIONS OF TWO-WINGED FLIES OF 

 THE FAMILY DOLICHOPODIDAE FROM ALASKA. 



By M. C. VanDuzee. 



Of Buffalo, New York. 



The insects herein described or otherwise noted were collected in 

 Alaska during 1921 by J. M. Aldrich, and the types of all the new 

 species are in the National Museum. 



Genus DIAPHORUS Meigen. 



Diaphorus Meigen, Syst. Besch., vol. 4, p. 32, 1824. — Schineh. Fauna Aus- 

 trica, vol. 1, p. 186, 1864.— Loew, Smiths. Misc. Colls., No. 171, 1864, p. 156.— 

 Wheeler, Psyche, vol. 5, pp. 359-360, 1890. — Aldrich, Diptera of St. Vincent, 

 Trans. Ent. Soc. London. 1896, part 3, pp. 320-324; Kansas univ. sci. Bull., 

 1902, vol, 1, pp. 85-87.— VanDuzee, Bull. Buffalo Nat. Sci., 1915, vol. 11, pp. 

 161-194; Psyche, vol. 24, pp. 33-39, 1917. 



DIAPHORUS PALPIGER Wheeler. 



DiapJiorus palpifjer Wheeler, Psyche, vol. 5, p. 360, 1890. — VanDuzee, Bull. 

 Buff. Soc. Nat. Sci.. vol. 11, p. 189, 1915. 



Ten males and females were taken at Anchorage, Alaska, June 14, 

 and July 19 and 21. Described from Wisconsin. Found all over 

 North America. 



DIAPHORUS OCCIDENTALIS VanDuzee. 



DiaphoruH occidentalis VanDuzee, Bull. Buffalo Soc. Nat. Sci., vol. 11, p. 

 180, 1915. 



One male taken at Fairbanks, Alaska, June 80. Described from 

 Oregon ; I took many of them in California and have seen specimens 

 from New Mexico. 



DIAPHORUS GIBBOSUS VanDuzee. 



Diapliorus gihbo.ius VanDuzp^e, Bull. Buffalo Soc. Nat. Sci., vol. 11, p. 173, 

 1915. 



One male taken at Anchorage, Alaska, June 13. Described from 

 the Northeastern United States and O'^'^'^no. I took several in Cali- 

 fornia. The color of the abdomen varies, in some it is velvety black, 

 while in otliers it is quite metallic. The thorax is always dark metal- 

 lic green posteriorly. 



DIAPHORUS FUSCUS VanDuzee. 



Diaphorus uditsliis VanDuzee, Bull. Buffalo So<.\ Nat. Sci., vol. 11, p. 172, 

 1915, von Wiedemann, 

 Diaphorus fuscus VanDuzee, Psyche, vol. 28, p. 122, 



Ten specimens taken at Anchorage, Alaska, July 13-19. Described 

 fi'oin Idaho and Nevada. 



No. 2490— Proceedings U. S. National Museum. Vol. 63. Art. 21. 



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