244 .BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



Described from 1 male from Colorado, taken by C. F. Baker; and 

 1 pair taken by Childs at Hood River, Oregon, August 2, 1914. 

 Type. -Male, Cat. No. 23053, U.S.N.M., from Oregon. 



No. 179. DOLICHOPUS SCAPULARIS Loew. 



Dolichopiis scapularis Loew, Neue Beitr., vol. 8, 1861, p. 22: Mon. N. Amer- 

 Dipt., pt. 2, 1864, p. 64.— Aldrich, Kansas Univ. Quart., vol. 2, 1898, p. 20.— 

 Mel.vnder and Brtje.s, Biol. Bull., vol. 1, 1900, p. 148.^ — Johnson, Insects 

 of New Jersey, 1909, p. 756. 



Male. — Length 3-5.7 mm.; of wing 4-5.7 mm. Face rather wide, 

 only a little narrowed below, silvery white, sometimes a very little 

 tinged with yellow just below the antennae. Front green, usually 

 with blue, rarely with violet reflections, with grayish pollen along 

 the orbits. Proboscis and palpi dark yellow. Antennae wholly 

 yellow, or nearly so; third joint from one and a fourth to twice as 

 long as wide, obtusely pointed at tip. Lateral and inferior orbital 

 cilia yellowish white, about seven of the upper cilia on each side 

 black. 



Thorax green; dorsum often with bronze reflections, sometimes it 

 is mostly blue or violet in color; humeral callosity yellow, sometimes 

 only yellow on its lower edge; usually the lateral edges of the dorsum 

 from near the root of the wing to the scutellum and lateral corners 

 of scutellum are yellow, sometimes the scutellum is yellow with a 

 metallic spot in the center at base, but sometunes the only yellow 

 to be found on the thorax is a line on lower edge of the humeral cal- 

 losity; the dorsum is dulled with rather conspicuous grayish or 

 yellowish pollen; pleurae dulled with white pollen. Abdomen green 

 with bronze reflections; the white pollen on its sides abundant and 

 extending upon the dorsum. Hypopygium black, usually with more 

 or less yellow especially at tip; its lamellae of moderate size, some- 

 what triangular, with the upper angle broadly rounded, white with 

 rather narrow black border on apical and up])er margins, jagged and 

 bristly on lower half of apical margin, above that fringed with 

 black hairs. 



Coxae yellow, middle ones with a blackish spot on outer surface; 

 fore coxae with minute yellow, hairs on the anterior surface and usu- 

 ally with a few little black ones along their inner edge. Femora and 

 tibiae yellow. Middle and hind femora each with one preapical bris- 

 tle, the latter ciliated for about half their length on lower inner edge 

 with yellow hairs, the longest of which is scarcely as long as the width 

 of the femora; they begin before the middle of the femora and do 

 not reach its tip, but are continued to tip and base by little yellow 

 hairs. Posterior tibiae only a little thickened, the usual glabrous 

 stripe on upper surface although not conspicuous is distinct and 

 reaches from near the base to beyond the middle of the tibiae; the 

 inner surface is glabrous from near the base nearly to the middle 



