224 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



sixth vein run a little more parallel with the margin of the wing; the 

 bfend in last section of fourth rein is also a very little farther from the 

 cross-viein in hruesi (fig. 161) in both sexes, in the male it is at basal 

 third not "before basal third," in the female of this form it is very- 

 near the middle of the last section, while in the female of con sanguin- 

 eus it is very near basal third. 



The specimens before me were taken by Dr. J. M. Aldrich at Roche 

 Harbor, Washington, July 3, 1905; Friday Harbor, Washington, 

 July 5, 1905; and Keyport, Washington, August 7, 1905, and two 

 specimens taken by Prof. A. L. Melander, one at San Francisco, 

 California, Aug. 15; the other at Canyon Camp, Yellowstone Park, 

 August 12, 1918. 



As all of these specimens agree in the wing characters given above, 

 as well as those given b}^ Melander and Brues, I am inclined to give 

 this form rank as a distinct species. 



Zetterstedt described a species from Europe under the name of 

 propinquus which still goes under that name, I therefore propose the 

 name of hruesi for the present species. 



Type locality. — Vancouver Island. 



Type. — ^In American Museum of Natural History, New York City. 



No. 162. DOLICHOPUS AURIFEX, new species. 



Male. — Length, 5.5-6.5 mm.; of wing 5-6 mm. Face wide, 

 whitish, tinged with yellow. Front green with bronze a- d coppery 

 reflections. Antennae black; first joint long with long stiff hair and a 

 large protuberance on inner side, which is largely yellow; second 

 joint wholly black, or with just a trace of yellow on inner side; third 

 wholly black, pointed at tip. Orbital cilia black above down to the 

 middle of the eye, below this pale yellow, a little darker below, 

 sometimes there are one or two black bristles next to the proboscis, 

 none of the cilia flattened, although the lower ones are rather stout. 



Thorax green with bronze reflections, which sometimes form two 

 narrow vittae on the dorsum, anterior slope of the dorsum with two 

 patches of white pollen and these patches clothed with black hairs, 

 as in the allied species. Abdomen green with coppery reflections, 

 and with white pollen on its sides. Hypopygium black, more or 

 less greenish; its lamellae (fig. 162a) of moderate size, brownish with 

 broad black apical border which shades into the bro^^^l of the disk, 

 somewhat oval, jagged at tip, frii^ged all around with blackish hairs 

 which are stoutest at apex, their disk clothed with minute hairs which 

 are pale near the base, black at their tips. 



Fore coxae yellow, more or less tinged with brown on outer side 

 and with a green stripe on outer posterior edge. Middle and hind 

 coxae black with narrow yellow tips. Trochanters with brown dots, 

 posterior ont'us brown. Femora and tibiae yellow. Middle and hind 



