102 DIPTERA OF NORTH AMERICA. [PART II. 



almost at a right angle, and this segment forms a curve, the con- 

 vexity of which is turned backwards. 

 Bab. Cuba. (Poey.) 



2. P. altooiiotatus, n. sp. % and 9 . — Obscure viridis, pedibus 

 .totis nigris, alis nigricantibus, priino costse dimidio valde incrassato. 



Dark green, feet entirely black, wings blackish, the first segment of the 

 costa very much thickened. Long. corp. 0.17 — 0.18. Long. al. 0.17. 



Dark green, sometimes more bronze-green. Face of the % 

 narrow, of the 9 a little broader ; in both sexes it is covered with 

 a snow-white dust. Palpi brownish-black. Antennae entirely 

 black, of very moderate size, the third joint rounded ; arista with 

 the usual short pubescence. Front covered with a rather dense 

 white dust. Cilia of the inferior orbit whitish. Thorax dark me- 

 tallic green, sometimes, with the exception of the posterior part of 

 the upper side, of a dusky bronze-color. The pleurae and the 

 triangular lateral impression on the transverse suture are covered 

 with a bright white dust. Scutellum of the same color as the 

 upper side of the thorax. Abdomen on the posterior margin of 

 the single segments usually rather blackish-blue-green, upon the 

 remaining part of the segments more golden-green or coppery ; 

 on the lateral margin covered with white dust. Hypopygium 

 disengaged, sessile, greenish-black ; lamellae only of very moderate 

 size, rounded, brownish-black. Coxae and feet black, the former 

 covered with black hairs, the latter with a greenish lustre ; fore 

 tibiae only with a simple row of bristles ; middle and hind tibiae 

 with numerous bristles. Tegulae blackish-brown, with black cilia. 

 Wings of moderate size, of an elongated-oval shape, blackened; 

 the last segment of the fourth longitudinal vein about its middle 

 is bent forward at an obtuse angle, and its tip, which reaches the 

 margin quite near the third longitudinal vein, forms a curve, the 

 concavity of which is turned backwards. In the % the portion of 

 the costa which lies before the end of the first longitudinal vein 

 shows a very strong swelling ; in the 9 this swelling is much 

 weaker, but still of a rather conspicuous size. 



Hab. New Orleans. 



