AKT. 23 TWO-WINGED DOLICHOPODID FLIES — VAN DUZEE 15 



a little bent just before its middle, parallel with third at tip; last 

 section of fifth vein one and a half times as long as the crossvein. 



Female. — Face and front moderately wide, silvery white; third 

 antennal joint longer than wide, arista nearly apical; lower orbital 

 cilia yellowish, reaching to the middle of the eye; thorax and scutel- 

 lum as in the male, except that the former has less pollen ; abdomen 

 wholly black with slight bronze reflections, its hair as in the male; 

 fore coxae black witli apical half a little yellowish, its hairs and 

 bristles black; all femora and tibiae yellow, the posterior femora 

 and tibiae blackened at tip; middle femora with a preapical brown 

 spot above; fore and middle tarsi black from the tip of the first 

 joint, which is half or more than half as long as their tibiae; hind 

 tarsi black, first joint twice as long as second and with minute bristles 

 below, especially at base. Calypters, their cilia and the wings as in 

 the male, except that the wings are more brownish, and last section 

 of fifth vein is fully twice as long as the crossvein. 



Descriljed from one pair taken at Lake Cushman, Mason County, 

 Washington, July 15, 1919, by F. M. Gaige; one male (the type, in 

 my collection) taken by E. P. Van Duzee, at Forks, Clallam County, 

 Washington, July 4, 1920; two females taken by J. M. Aldrich, Fun- 

 day Harbor, Washington, May 30, 1906, and Longmires Springs, 

 Washington, August 2, 1905. 



Para^y;?e.— Female ; Cat. No. 27039, U.S.N.M. 



9. ARGYRA ARGENTIVENTRIS, new species 



Male. — Length, 4.2 mm. Face and front silvery white ; face quite 

 narrow. Palpi brown, more or less yellow on apical half and with 

 yellow hairs. Antennae black; first joint with several hairs above; 

 third joint as long as first two together, its point obtuse; arista in- 

 serted a little before the tip of third joint, as long as the antenna; 

 lower orbital cilia yelloAvish. 



Thorax green with abundant silvery pollen; acrostichal bristles 

 large ; in front they are in two rows, but the three posterior bristles 

 are in a single row. Abdomen blackish with green reflections, 

 wholly covered with silvery pollen; the sides of the second segment, 

 except the hind margin and the extreme base of first and third seg- 

 ments, are slightly yellowish. Hypopygium (fig. 24) black, small, 

 its outer lamellae yellowish-brown, rounded at tip ; inner appen- 

 dages black, rounded, with a minute spine at tip. 



Fore coxae yellowish, brown on outer surface; they have a few 

 short black hairs on anterior surface and four black bristles near 

 the tip; middle and hind coxae blackish. Femora yellow, a little 

 more than apical third of posterior pair black; fore femora with 

 black hairs on posterior surface, which are as long as the thickness 

 of the femora; middle femora witli the hairs near the lower edge 



