ART. 21. DOLICHOPOD FLIES FROM ALASKA — VanDUZEE. 13 



joint rounded at tip; arista stout, nearly as long as the thorax, 

 tipped with a large roundish lamella. Lower orbital cilia pale. 



Thorax and scutelluni bronze brown with more or less blue re- 

 flections; dorsum dulled with brown pollen: pleurae with white 

 pollen. Abdomen metallic green, sometimes almost black, sides of 

 second segment and the venter more or less yellow; hair on the 

 abdomen and bristles on sides of first segment yellow. Hypopygium 

 rather large, black with small black appendages and two slender 

 filaments extending backward (probably the penis and its sheath). 



All coxae yellow, middle pair darkened on outer surface, hairs 

 on fore coxae yellow; the slender erect bristle on hind coxa black, 

 still it appears yellow in certain lights. All femora yellow, the 

 apical half of posterior pair more or less black; middle and hind 

 femora each with a small preapical bristle, the latter with long yel- 

 low hairs on the lower edge of both inner and outer surface, which 

 are longer and more brown apically. Fore and middle tibiae yellow, 

 slehder, with yellow liairs, middle ones with two slender bristles on 

 upper anterior edge. Hind tibiae blackish, sometimes slightly yel- 

 loAv at base, their hairs yellow, bristles black. Fore tarsi (fig. 1) 

 yellow, black from the tip of second joint; first joint short, about 

 as long as wide; second longer than the remaining three taken to- 

 gether; third and fifth of nearly equal length, fourth distinctly 

 longer and a little curved. Middle tai-si black from the tip of first 

 joint, which is as long as the tliree following taken together. Sec- 

 ond and third of nearly equal length, each with several long hairs, 

 fourth slightly shorter than third, fifth half as long as third. Hind 

 tarsi wholly black, second joint slightly longer than first. Calyp- 

 ters, their cilia and the halteres yellow. 



Wings grayish hyaline, tinged with brown in front of fourth vein; 

 third and fourth veins very slightly convergent at their tips, fourth 

 ending just before the tip of the wing; wing narrowed at base from 

 a point nearly opposite the tip of the first vein. 



Female. — Face wide, its pollen gray; antennae small, arista 

 plain; fore tarsi blackened from the tip of the first joint, which is 

 nearly as long as the remaining four taken togetrer, last four joints 

 of slightly decreasing length; hind femora more or Irss infu'^cated 

 at tip; fore femora slightly infuscated at base; middle and hind 

 coxae blackened. Wings not narrowed at base. 



Described from 13 males and 14 females. Eleven males and 11 

 females were taken at Anchoiage, Alaska, June 15 to July 21: three 

 females at Seward, Alaska, July 24, these were taken by Dr. J. M. 

 Aldrich; two males and two females were taken at Grant, Colorado, 

 August 19, by PI C. Jackson. 



2'y^e._Male, Cat. No. 25962, U.S.N.M.. from Anchorage. 



