THE DIPTEEOUS GENUS DOLICHOPUS IN NORTH AMERICA. 125 

 No. 80. DOLICHOPUS VIRGA Coquillett. 



Dolichopus virga Coquillett, Canadian Entomologist, vol. 42, 1910, p. 41. 



Male. — Length 4.5 mm. ; of wing the same. Face rather wide, sil- 

 very white. Front dark shining green. Antennae black; first joint 

 very slightly yellowish on lower apical corner; third joint rather 

 large, twice as long as wide, somewhat oval in outline, but obtusely 

 pointed at tip. Lateral and inferior orbital cilia whitish, about six 

 of the upper cilia black. 



Thorax green, dorsum dulled with brown pollen and pleurae with 

 white. Abdomen green with slight bronze reflections and black in- 

 cisures; white pollen on its sides abundant and extending upon the 

 dorsum. Hypopygium black; its lamellae of moderate size, some- 

 what triangular in outline, apical margin straight and with an acute 

 point at lower corner, whitish with a narrow black border on the 

 oblique apical margin, which is fringed with rather long black hairs 

 but not jagged. 



Fore coxae yellow with a black spot on outer side at base, anterior 

 surface covered with 'silvery pollen and little black hairs. Middle 

 and hind coxae black with yellow tips. Femora and tibiae yellow. 

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

 with a blackish spot at tip on upper surface, nearly bare below. 

 Middle tibiae without a bristle below; posterior tibiae black at tip 

 for one-fifth their length. Fore tarsi (fig. 80a) about as long as their 

 tioiae, black from the middle of the third joint; first two joints com- 

 pressed, very thin but not widened, first as long as the remaining 

 four taken together; last three joints compressed, of nearly equal 

 length, third slightly widened at tip, fourth and fifth more (verti- 

 cally) widened and fringed on either edge with little black hairs so 

 as to form an oval tip to the tarsi. Middle tarsi a little longer than 

 their tibiae, olack from the tip of the first joint. Hind tarsi wholly 

 black. Calpyters and halteres yellow, the former with black cilia. 



Wings (fig. 80) grayish, usually slightly darker in front of the 

 third vein; costa not enlarged at tip of first vein; last section of 

 '"ourth vein only a little bent near its middle; tips of third and fourth 

 veins widely separated; hind margin of wing only slightly indented 

 at tip of fifth vein, evenly rounded; anal angle rather prominent 

 but rounded 



Female. — Face wide; third antennal joint smaller than in the male, . 

 about one and a half times as long as wide; the black spot at tip of 

 hind femora not as conspicuous; fore tarsi plain, a little longer than 

 their tibiae, infuscated from the tip of the first joint. Middle tibiae 

 with one bristle below, their basitarsi without a bristle above. 



Redescribed from the type and 1 other male and 1 female in the 

 National Museum collection, all taken at Manahawkin, New Jersey, 

 187329—21 9 



