ART. 21. DOLICHOPOD FLIES FROM ALASKA VanDUZEE. H 



three pair of long hairs basally on its margin, and two small black 

 hairs on the disk; propleurae with long white hairs. Abdomen 

 metallic green, dulled with gray pollen, hairs on the dorsum black, 

 those on the sides of the first three segments and extending onto the 

 dorsum of first are yellowish and on the lower edge long and dense. 

 Hypopygium (fig. 10) black, rather small, upper half dull, lower 

 part shining; outer lamellae somewliat triangular, black, fringed 

 with long pale hairs, they are scarcely as long as the height of the 

 hypopygium; inner appendages long and shining black, pointed, 

 extending forward under the abdomen; they have several delicate 

 hairs on upper surface. 



Coxae, legs and feet wholly black, except extreme tip of fore tibia, 

 apical half of middle tibia and base of fore and middle basitarsi, 

 which are yellowish. All coxae with long whitish haii-, that on the 

 anterior pair very dense; middle pair with a thorn of black bristles 

 at tip. All femora fringed with long whitish hairs on lower posterior 

 surface, those on middle pair not so numerous but on the others very 

 abundant; posterior ones also have besides those already mentioned 

 a few pale hairs on lower outer edge ending with one or two black 

 ones and with a small black preapical bristle. Tibiae with numerous 

 bristles on upper surface, those on posterior ones more scattering. 

 Fore tarsi as long as their tibiae, first joint as long as the three 

 following taken together, second, third, and fourth each a little 

 shorter than the preceding one; fourth, and fifth of about equal 

 length; fore basitarsus considerably enlarged below at tip. Hind 

 tarsi stout, scarcely as long as their tibiae, first and second joints 

 of equal length. Calypters and stem of halteres brownish, cilia of 

 the former whitish, knobs of halteres yellow. 



Wings tinged with brownish gray, darkest in the middle of the 

 cells, a hyaline spot surrounds the cross-vein and extending some- 

 what along the upper edge of the fifth vein; last section of fourth 

 vein bent at its middle; third vein bent at about the same distance 

 from its tip so as to approach fourth and about parallel with it near 

 their tips, fourth ending in the apex of the wing: first vein reaching 

 about half the distance to the cross vein; last section of fifth vein 

 twice as long as the cross vein. 



Described from one male taken at Anchorage, July 21. 



7'//7?e.— Male, Cat. no. 25961, U.S.N.M. 



PORPHYROPS. species. 



Thirteen females were taken which I am not able to determine. 



Genus XIPHANDRIUM Loew. 



Xiphandrium Loew, Neiie Beitr., vol. 5, p. 3G, 1857.— Becker. Zoologisch- 

 Botaniche Gesellschaft, Wien, vol. 3, Heft 1, p. 150, 1921.— N'.wl »i zi;i-. 'J'rnns. 

 Amer. Ent. Soc, vol. 48, pp. 79, 1922. 



5596— 24— I'roe.N.M.vol.ea— 39 



