THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 75 

 No. 35. DOLICHOPUS CONVERGENS Aldrich. 



Dolichopus convergens Aldrich, Kansas Univ. Quart., vol. 2, 1893, p. 9. 



Male. — Length 4 mm.; of wing 3.8-4 mm. Face rather narrow, 

 silvery white. Front green or blue green. Antennae (fig. 35a) 

 wholly black; third joint oval, not much longer than wide, obtusely 

 pointed at tip. Lateral and inferior orbital cilia yellowish white, 

 the black cilia descending about one fourth the eye height. 



Thorax dark green, dorsum dulled with nearly invisible brown 

 pollen and with blue reflections; pleurae dulled with a little grayish 

 pollen. Abdomen dark green with narrow black incisures, slight 

 blue reflections and a little white pollen on the lower part of the 

 sides. Hypopygium black; its lamellae are not very large, some- 

 what triangular in outline, whitish with a moderately wide border, 

 jagged and bristly at apex and with a few delicate hairs on the upper 

 and lower edges. 



Coxae black with yellow tips; anterior pair with silvery pollen 

 and little black hairs on the front surface, the usual row of bristles 

 at tip. Trochanters yellow. Femora black with yellow tips. 

 Middle and hind femora each with one preapical bristle, the latter 

 without cilia below. Tibiae yellow, posterior pair with their tips 

 narrowly black, scarcely thickened. Fore and middle tarsi a little 

 longer than their tibiae, black from the tip of the first joint, still 

 the base of the second joint is yellowish. Hind tarsi wholly black. 

 Calypters and halteres yellow, the former with black cilia. 



Wings (fig. 35) a little grayish; costa scarcely enlarged at tip of 

 first vein; last section of fourth vein bent near its middle; third and 

 fourth veins convergent, their tips about one-third as far apart as 

 the tips of the second and third veins ; fourth vein ending nearly the 

 length of the cross-vein before the apex of the wing; hind margin 

 of wing not indented at tip of fifth vein; anal angle obsolete, the 

 wing being narrowed toward the base. 



Female. — Face nearly as wide as the front, white; third antennal 

 joint a little smaller; otherwise about as in the male. 



Redescribed from one of the type specimens and several specimens 

 from Mount Constitution, Washington, July 7 and 17; and Keyport, 

 Washington, August 7 (Aldrich). 



Type locality. — Mount Hood, Oregon. 



No. 36. DOLICHOPUS NUBIFER, new species. 



Male. — Length 4-4.5 mm.; of wing 4 mm. Face rather narrow, 

 its sides nearly parallel, silvery wliite. Front shining green. An- 

 tennae wholly black; third joint about as long as wide, somewhat 

 rounded at tip; arista longer than antenna. Orbital cilia wholly 

 black. 



