THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 49 



the fore coxae all black; hind femora without a row of hairs below; 

 hiad tibiae not thickened. It agrees with the male in color, the 

 wing venation, and in the middle tibiae having one bristle below and 

 middle basitarsi being without a bristle above. 



Redescribed from 8 males and 14 females taken by J. M. Aldrich: 

 Kendrick, Idaho, May 25; St. Anthony, Idaho, June 16; and Wells, 

 Nevada, July 16; and 1 female from Rainier, Washington, Aug. 30, 

 at an elevation of 5,000 feet. I took 3 females in San Diego County, 

 California, on the edge of the desert, Apr, 15, 



Type locality. — Northern Sonora, Mexico. Melander and Brues 

 report it from California, Type in British Museum; the identifica- 

 tion is from the description only. 



The males of ovatus, acuminatus, myosota, and nigrimanus are 

 very much alike but they differ in the formation of the lamellae of 

 the hypopygium; myosota has the lamellae smaU and truncate at 

 apex; ovatus and nigrimanus have them rounded at apex, those of 

 the former are smaller and less rounded than those of the latter; 

 acuminatus has the lamellae long and acutely pointed at tip. 



The female of ovatus has the third and fourth veins more convergent 

 than those of acuminatus, the fore tibiae and fore and middle basi- 

 tarsi of the former are less yellowish, but the females of the two 

 species are not easily separated. The females of myosota and nigri- 

 manus differ from the two species mentioned above in having the 

 legs and feet wholly deep black, except that the knees may be a 

 very little yeUo\vish, They differ from each other in that myosota 

 has third and fourth veins nearly parallel beyond the bend in fourth 

 vein, while in nigrimanus they are more convergent; the two last are 

 western and the former two are eastern species. The female of 

 adaequatus ought to be mentioned here as it is very much like those 

 mentioned above, except that it has two bristles below on the middle 

 tibiae. 



No. 12. DOLICHOPUS MULTISETOSUS, new species. 



Male. — Length 3.5-4,25 mm.; of wing 3,5-4 mm. Face rather 

 wide, silvery white, narrowed a little below. Front shining green, 

 sometimes with bronze reflections. Antennae wholly black, third 

 joint nearly orbicular in outline, but the notch where the arista is 

 inserted makes the tip somewhat pointed. Lower orbital cilia 

 glistening white, those near the proboscis a little flattened, scale-like, 

 the black cilia descend about one-fourth of the eye height. 



Thorax dark shining green, sometimes with bronze reflections; 

 pleurae black, dulled with gray poUen. 



Abdomen gi-een with black incisures and coppery reflections, 

 especially on the apical segments. Hypopygium black; its lamellae 

 (fig, 12o) moderately small, somewhat triangular in outline, but 



