154 DIPTERA OF NORTH AMERICA. 



where ; face rather broad, pale ocliraceous ; antenna? and legs black ; 

 base of all the tarsi red. Long. corp. 0.12. Long. al. 0.15. 



Face rather broad, becoming a little broader upwards, only 

 slightly keeled above, ocliraceous, with three small bristles on 

 each side. Palpi yellow. Cheeks slightly descending. Antennae 

 black; antennal bristle in the described specimen with five rays. 

 Front greenish-gray and opaque in consequence of its grayish 

 dust; the dot above the antennas has a still duller yellow color 

 than the face and is not conspicuous. Upper side of the thorax 

 and scutellum greenish-gray and opaque from its whitish-gray dust. 

 Pleuras a little paler greenish-gray. Abdomen grayish-green, 

 opaque, with the fifth segment considerably longer than the fourth. 

 Legs black; tarsi yellowish-red as far as the end of the first joint; 

 also the knees, chiefly those of the hind legs, are of this color. 

 Poisers yellow. Wings relatively to the length of the body, large, 

 hyaline ; the veins in the neighborhood of the base pale ocliraceous ; 

 the second segment of the costal vein about twice as long as the 

 third; the posterior transverse vein does not stand quite perpen- 

 dicularly to the longitudinal axis of the wing, but is slightly 

 oblique. 



Jlab. Middle States. (Osten-Sacken.) 



6. U. formosa Loew. 9 • (Translated from Berl. Entom. Zeitschr. 

 1861, p. 355, by R. Osten-Sacken.) — Atra, thoracis dorso, abdominis apice 

 marginibusque nitidis, fronte, thoracis macula laterali permagna scutel- 

 loque aterrimis, opacis, facie, puncto frontali, pleuraruinque vitta supe- 

 riore, candidis, femoribus nigris, tibiis tarsisque pallidis, alis cinereo- 

 hyalinis. 



Dark, thorax above, tip of the abdomen and its borders shining ; front, a 

 large spot on the side of the thorax and scutellum deep black, opaque ; 

 the face, a dot on the front and a band on the upper side of the pleura 

 shining white, femora black, tibia? and tarsi pale, wings cinereous-hya- 

 line. Long. corp. 0.057. Long. al. 0.064. 



Face moderately convex, not keeled, bright shining white, 

 ("hecks very narrow, black. Front and superior part of occiput 

 deep black, velvety, with a striking shining white frontal mark. 

 Antenna) black, third joint rufous, margined with black above, 

 bristle pectinated with scattered black hairs. Thorax wry shining 

 above, on each side a large, deep black, velvety lateral spot. 



