232 BULLETIN 11^, UNITED STATES NATIONAL MUSEUM. 



Thorax and abdomen dark blue-green, the latter with bronze 

 reflections, and thin white pollen on its sides. Hypopygium black, 

 its lamellae of moderate size, somewhat oval, but narrowing into the 

 stem, about twice as long as wide, whitish with a narrow black 

 border on upper and apical margins, jagged and bristly at lower 

 apical corner, otherwise fringed on apical and upper edges with 

 delicate little brown hairs. 



Fore coxae wholly yellow, their anterior surface with minute 

 white hairs. Femora and tibiae yellow. Middle and hind femora 

 each with one preapical bristle, the latter nearly bare below, still 

 with a row of very minute yellow hairs on lower inner edge. Hind 

 tibiae scarcely thicker than the others, a very little brownish at 

 tip. Fore and middle tasi about one and one third times as long as 

 their tibiae, the former yellow with the last two joints blackish, 

 first joint as long as the three following joints taken together, third 

 and fifth of about equal length, fourth but little more than half as 

 long as third . Middle tibiae with a pair of rather small bristles below 

 at apical third, their tarsi black from the tip of the first joint, which 

 has a very small bristle above near apical third. Hind tarsi slender, 

 black from the tip of the first joint, which is brownish yellow. 

 Calypters and halteres yellow, the former with black cilia. 



Wings (fig. 168) narrow, a little grayish; costa not enlarged at tip 

 of fifth vein ; last section of fourth vein a little bent before its middle ; 

 third vein bent backward a little at tip; hind margin of wing not 

 indented at tip of fifth vein, evenly rounded; anal angle obsolete, 

 the wing being narrow at root. 



Described from 1 male which I took at Kearney, Ontario, July 2, 

 1909. 



Type.— Male, Cat. No. 23048, U.S.N.M. 



No. 169. DOLICHOPUS LATRONIS, new species. 



Male. — Length 4 mm. ; of wing the same. Face wide, narrowed a 

 little below. Front shining green. Antennae black; first joint 

 yellow below for half its width or more; third joint but little longer 

 than wide, somewhat rounded at tip. Lateral and inferior orbital 

 cilia yellowish white, about six of the upper cilia on each side black. 



Thorax green; dorsum a little dulled with gray pollen, which is 

 rather thick along the front; pleurae dulled with white pollen. Ab- 

 domen green with coppery reflections on the last two segments; the 

 white pollen on its sides abundant. Hypopygium black; its lamel- 

 lae (fig. 169a) rather large, somewhat subquadrate in outline, whitish 

 with narrow black border on apical margin, which extends a little 

 way on the lower edge and ends abruptly; it also extends narrowly 

 along the upper 'edge, jagged and bristly at apex, fringed above with 

 delicate but rather long brown hairs. 



