58 BULI.ETIN 116, UNITED STATES NATIONAL MUSEUM. 



glabrous stripo on u])])er surface between the bristles narrow, inside 

 of the inner row of bristles is another glabrous stripe extendmg their 

 entire length. Fore tarsi (fig. 20) one and a third times as long as 

 their tibiae; first joint longer than the three following joints taken 

 together and second joint longer than the two following; fourth 

 joint shorter than third and a little wider; fifth much compressed and 

 about equal to the second in length, somewhat round in outline, but a 

 little wider at tip where it is rather truncate, on the inner side the 

 fifth joint can be seen running across the expanded part about its 

 normal size, at tip the upper part extends over the claws a little. 

 Middle basitarsi with a large bristle above near its apical third. 

 Calypters and halteres yellow, the former with black cilia. 



Wings grayish, rather strongly tinged with brown in front of third 

 vein, of rather parallel width, costa not enlarged at tip of first 

 vein; last section of fourth vein bent before its middle, tip of third 

 vein bent backward a little at tip; hind margin of wing a little 

 indented at tip of fifth vein, there is a quite conspicuous sinus 

 between the tips of fifth and sixth veins, anal angle prominent. 



Female. — Face wide, gray, tinged a little with yellow; fore tibiae a 

 little yellowish as in the male, fore tarsi plain, fifth joint longer than 

 fourth; middle basitarsi with a large bristle above; wing as in the 

 male, except that there is no sinus on hind margin, the wing being 

 more evenly rounded. 



Redescribed from the type material taken at Webber Lake, Cali- 

 fornia, July 24-26; now in Museum of Comparative Zoology, Cam- 

 bridge, Massachusetts. 



A female taken by Edward P. Van Duzee at Grass Lake, Tahoe, 

 California, June 24, 1915, seems to belong here and agrees with th€ 

 type specimens, except that the fore tibiae are wholly black, not at all 

 yellowish. Another female agreeing with this one was taken by 

 R. P. Currie, at Kokanee Mountains, British Columbia, Aug. 10, 

 1903, at an elevation of 8,000 feet. 



No. 21. DOLICHOPUS ACRICOLA, new species. 



Male. — Length 4 mm.; of wing 3.5 mm. Face rather wide, 

 yellowish brown. Front dark shining green. Antennae black, 

 first joint conspicuously yellow below; third joint rather small, 

 not much longer than wide, rounded at tip. Palpi yellowish with 

 black hairs. Orbital cilia wholly black. 



Thorax dark green, slightly dulled with brown pollen. Abdomen 

 and hypopygium dark green with bronze reflections; lamellae of the 

 latter moderately large, somewhat elliptical in outline but narrowed 

 into the stem, about twice as long as wide, dark yellowish brown 

 with a black border on apical margin, jagged and bristly at apex, 

 fringed on both edges with delicate brown hairs. 



