262 DIPTERA OF NORTH AMERICA. [PART II. 



taken together ; the second to the fourth joint of gradually de- 

 creasing length, the fifth joint very short. Halteres dingy clayish- 

 yellow, the basis of the peduncle black, and the upper side of the 

 knob brown. Tegulre with a broad black margin and long black 

 cilia. Wings hyaline with black veins ; auxiliary vein unusually 

 indistinct, still present, first longitudinal vein extending far 

 beyond the middle of the anterior margin ; the margin has a fringe 

 of very delicate, erect, curly, minute hairs, from the humeral trans- 

 verse vein to the tip of the first longitudinal vein, which are 

 longest between those two points where the margin is slightly 

 sinuous ; the anterior branch of the fourth longitudinal vein 

 diverges from this at an angle which is almost a right one, and 

 turns afterwards, more in a curve than at an angle, towards the 

 margin of the wing, which it reaches before the apex, immediately 

 near the tip of the third longitudinal vein ; the posterior trans- 

 verse vein is rather oblique and only very little sinuated. 



Hab. Florida. (Osten-Sacken.) 



Observation. — I have already remarked above, with regard to 

 P. mundus Wied., that P. ciliatus differs from it only by its 

 larger size, its more steel-blue than purplish coloring, and, as 

 it seems, by a very trifling difference in the bristles of the fore 

 tibise ; it is therefore very likely but a mere variety of the former. 



B. First longitudinal vein at the most reaching to the middle of the wing. 

 1. Arista apparently apical and strikingly elongated. 



9. P. COiaiatllS Loew. % and 9 • — Viridis, ex parte chalybeus, niti- 

 dissirnus, fasciis abdorninalibus obscuris nullis, seta aritennarum sub- 

 apicali elongata, pedibus longis, gracilibus, dilute flavis, coxis femori- 

 busque nigris, setis in superiore tibiarum anterioruni latere perlongis. 



£ . Setis capitis, tboracis, scutelli abdominisque tenuibus, longissimis, 

 appendicibus hypopygii pallidis, tarsorurn anticorum articulo primo 

 tarsisque intermediis superne ciliatis. 



9 . Setis capitis, tboracis, scutelli abdominisque tenuibus, mediocribus, 

 tarsorurn anticorum articulo primo setulis minutis subciliato, tarsis 

 intermediis simplicibus. 



Green, partly steel-blue, very shining, without dark bands on the abdomen ; 

 wings without picture ; the elongated arista apparently apical ; feet 

 long, slender, pale-yellowish, coxae and femora black ; the bristles upon 

 the upper side of the four anterior tibiae very long. 



% . Bristles upon head, thorax, scutellum, and abdomen slender, extremely 



