ART. 23 TWO-WINGED DOLICHOPODID FLIES VAN DUZEE 17 



on lower, outer edge, which is not as long as their width. Fore and 

 middle tibiae yellow, the latter slightly swollen on anterior surface 

 near the middle and again at tip ; on the middle swelling are about 

 10 hairs, which are much longer than the thickness of the tibia. 

 Hind tibiae with basal half yellowish, apical half black, sometimes 

 the basal half is darker below. Fore tarsus with its joints as 39-14r- 

 10-7-7, first joint with a few bristles below; middle tarsus with its 

 joints as 50-19-17-9-8; joints of hind tarsus as 32-28-20-12-8. 

 Calypters brown with a black border and long, black cilia. Halteres 

 yellow. 



Wings grayish; third vein bent backward at tip; last section of 

 fourth vein a little bent before its middle, parallel with third beyond 

 this bend, ending in the apex of the wing; last section of the fifth 

 vein one and a half times as long as the crossvein. 



Female. — Face wide, its suture below the middle; lower edge of 

 face rounded; face, front, palpi, and proboscis covered with gray 

 (some might call it yellowish-gray) pollen. Third antennal joint 

 scarcely as long as wide; arista subapical, longer than the antenna. 

 Coxae as in the male ; all femora and tibiae yellow ; posterior femora 

 and tibiae with apical fourth to apical half black ; femora with only 

 short hair ; middle femora and tibiae plain. 



Abdomen with the white pollen confined to the lower part of the 

 sides. 



Wings as in the male. 



Described from two males and three females which I took in 

 California; one male at Los Angeles, April 30; one male and two 

 females at Alpine, San Diego County, April 8 and 10 ; and one female 

 at Los Cerritos, Los Angeles County, April 3. 



r^/pe.— Male, Cat. No. 27041, U.S.N.M. 



11. ARGYRA ALBIVENTRIS Loew 



Argyra alMventris Loew, Smiths. Misc. CoU., No. 171, p. 128, 1S64. 



Joints of front tarsi, measured from a small specimen (4.5 mm.) 

 as 40-16-10-7-7; measured from a large specimen (6 mm.) are as 

 43-20-12-8-8 ; joints of the posterior tarsi from a small specimen as 

 36-33-20-12-9, measured from a large specimen they are as 40-35- 

 25-15-11. There are only very small bristles on the lower surface of 

 the first joint of anterior pair, not much more than hairs. Calypters 

 mostly black, their cilia black. 



Described from Sitka, Alaska. Have seen specimens from the 

 following locations: Hood River, Oregon, September 28, taken by 

 F. R,, Cole ; Seattle and Dewatto, Washington, June 7. J. M. Aldrich 

 took it in the following places in Idaho : Juliaetta, June 16 ; Viola, 

 June 29; Bovill, July 15; and in Craigs Mountain. 



9123—25 3 



