ART. 23 TWO-WINGED DOLICHOPODID FLIES VAN DUZEE 7 



Coxae black, anterior and posterior pairs sometimes yellowish on 

 apical half; fore and middle pairs with long black bristlelike hairs; 

 hind ones with two bristles on outer surface. All femora black, 

 sometimes a little yellow at base. Fore femora and tibiae with long, 

 slender, black hairs on posterior surface, which are longer than the 

 width of the femora; middle femora with a row of stout hairs on 

 lower anterior edge of apical two-thirds, not as long as the Avidth of 

 the femora and shorter toward the tip; hind femora with a row of 

 hairs on lower outer edge which are about as long as the upper row 

 on outer edge. All tibiae j-ellow, the posterior ones black at tip for 

 one-fifth their length, still the black is not sharply defined and some- 

 times reaches the middle of the tibiae; middle tibiae rather stout, 

 with long bristles abo^e and a few long hairs below, the longest 

 being near apical third and about as long as the thickness of the 

 tibia. Fore and middle tarsi blackened from the tip of the first 

 joint; anterior pair with their joints as 4S-19-12-8-8, first joint with 

 a few slender hairs below ; middle basitarsus with numerous bristly 

 hairs below on basal half, which are nearly as long as the diameter 

 of the joint. Hind tarsi wholly black, its joints as 37-30-21-12-8. 

 Calypters brown, with broadly black tips and black cilia ; knobs of 

 halteres yellow, with a small brown spot near the base, their stem 

 brownish. 



Wings tinged with brownish gray: third vein considerabh' bent 

 back at tip; last section of fourth vein bent at its middle, parallel 

 with third near the 'tip; last section of fifth vein twice as long as 

 the cross vein. 



Female. — Face broad, gray or yellowish gray : third antennal joint 

 about as long as wide, arista nearly twice as long as the antenna ; 

 fore coxae mostly black; all femora and tibiae yellow, with short 

 hair, posterior femora and tibiae usually broadly black at tip. 

 Wings about as in the male. 



Redescribed from 29 males and 3 females. I took many in Cali- 

 fornia from March 21 to June 7; Doctor Aldrich took it in Idaho. 

 June 7, and in Washington, June 7 and July 6. It was described 

 from Sitka, Alaska. 



2. ARGYRA HIRTA, new species 



Male. — Length, 4 mm. Face rather wide, grayish, almost black. 

 Front greenish with gray pollen. Antennae black (fig. 3) ; first joint 

 with stiff hairs above; third joint but little longer than wide; arista 

 three times as long as the antenna. Palpi black with long black 

 hairs. The minute black orbital cilia scarcely reach down to the 

 middle of the eye, below these the beard is black or brown, not 

 abundant. 



