238 DIPTERA OF NORTH AMERICA. [PART II. 



9 . Tibiis ex flavo testaceis, lialteribus flavis, abdomine subobsolete nigro- 

 fasciato. 



Dark bronze-green, head, scutellum and bind part of the thorax sometimes 

 violet ; abdomen coppery, at the tip violet, at the basis usually green ; 

 face glabrous, feet plain and dark colored ; the two broad black bands 

 on the wings are united in front and shortened behind ; on the fourth 

 longitudinal vein they again run together, so as to enclose a rather large 

 hyaline drop. 



% . Tibiae dark pitch brown, halteres brown-black ; abdomen with black 

 bands ; the small hypopygium with small black appendages. 



9 . Tibiae yellow-brownish ; halteres yellow ; abdomen with but rather 

 indistinct black bands. Long. corp. 0.18 — 0.22. Long. al. 0.17 — 0.19. 



Syn. Psilopus guttula Wiedemann, Auss. Zweifl. II, 222, 18. 



Of moderately bright, dark-metallic color, which seems to be 

 chiefly green on head and thorax ; on the abdomen principally 

 coppery and violet. Head shining green, rarely shining black- 

 green, though the front is always steel-blue or violet ; on the ver- 

 tex, besides the usual bristles, it is also beset with black hairs. 

 The face is not very broad, without hair, and exhibits but a slight 

 trace of whitish dust. Antennae black, of moderate size ; the bris- 

 tles of the second joint not very long. Palpi black, beset with a 

 few stiff black hairs ; proboscis brown-black. Thorax dark metal- 

 lic green, usually on the lateral margin and sometimes on the 

 whole posterior half of a violet color. The bristles of the thorax 

 and the four bristles of the green or violet scutellum are black ; 

 pleura green, on the posterior margin more black, everywhere 

 covered with white dust. Abdomen towards the tip, especially 

 in the male, very pointed ; its color is usually chiefly coppery, at 

 the tip always violet, near the basis often green ; sometimes the 

 violet color extends almost over the whole abdomen, but even then 

 the posterior margins of the fore and middle abdominal segments 

 remain of a coppery color. In the male each of the abdominal 

 segments has near the basis a broad, but not sharply defined black 

 band ; there are also traces of them in the female. The black hair 

 on the abdomen and the black bristles before the posterior margin 

 of each segment are but of middling length. The extremely small 

 hypopygium is black ; its short appendages are blackish. Coxae 

 black with thin white dust, the foremost ones with white hair and 

 in the vicinity of the tip with a few black bristles. Femora black, 

 on the under side with rather long erect white little hairs, inter- 



