THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 71 



each with one preapical bristle, the latter ciliated on lower inner 

 edge with stiff white hairs on apical two-thirds, these hairs nearly 

 as long as the width of the femora, they do not quite reach the tip. 

 Fore and middle tibiae yellow; hind tibiae black, moderately thick- 

 ened, yellow on their upper edge for one-third their length. Fore 

 and middle tarsi a little longer than their tibiae, black from the tip 

 of first joint, the joints of regularly decreasing length; fore basitarsi 

 about as long as the three following joints taken together; middle 

 basitarsi about as long as the two following joints and without a 

 bristle above. Hind tarsi wholly bla,ck. Calypters and halteres 

 yellow, the former with pale cilia, still there are usually a few black 

 hairs among the cilia. 



Wings grayish (fig. 31) ; costa scarcely enlarged at tip of first vein; 

 last section of fourth vein bent beyond its basal third; third and 

 fourth veins nearly parallel beyond the bend; hind margin of wing 

 scarcely indented at tip of fifth vein, nearly evenly rounded, anal 

 angle of wing not very prominent. 



Described from 7 males taken by A. L. Melander in "Washington, 

 1 at Prosser, May 4, 1911, and 6 at Kennewick, June 7, 1916. 



Type taken at Kennewick, Washington, and in the A. L. Melander 

 collection. One paratype in the United States National Museum. 



Paratype.~M&\e, No. 22992, U.S.N.M. 



No. 32. DOLICHOPUS JOHNSONI Aldrich. 



Dolichopus johnsoni Aldrich, Kansas Univer. Quart., vol. 2, 1893, p. 7. 



Male. — Length 3.2-4 mm.; of wing 3-3.2 mm. Face narrow, 

 yellowish on upper portion, more white below, sometimes entirely 

 white. Front green, not very dark, shining. Antennae (fig. 32a) 

 wholly black; third joint a little longer than wide, its form nearly a 

 perfect oval. Palpi yellowish brown. Orbital cilia wholly black. 



Thorax green, dorsum with more or less bronze reflections and a 

 little white poUen on the front edge; pleurae more blackish with 

 white pollen. Abdomen green with black incisures and slight 

 bronze reflections; the white pollen on its sides abundant and v^isible 

 almost to the center of the dorsum. Hypopygium black; its lamellae 

 rather small, somewhat triangular in outlfne, but rounded on upper 

 corner, white with a narrow black border apically, where it is jagged 

 and bristly. 



Coxae black with narrow yellow tips. Fore coxae with white 

 pollen and little black hairs on their anterior surface. Femora 

 black with yellow tips. Middle and hind femora each with one 

 preapical bristle, the latter with brown cilia on lower inner edge of 

 apical half, the longest of these hairs about three-fourths as long as 

 width of femora. Fore and middle tibiae yeUow. Hind tibiae 

 black, a little thickened, the glabrous stripe on upper surface can 



