psilopus. 23 7 



side of the very elongated first joint a few small, very short bris- 

 tles ; moreover in the male the two last joints, upon their posterior 

 side, are beset with short, but dense, snow-white hair. Hind tibiae 

 and hind tarsi black or brown-black; the usual black hair upon 

 the former is rather long, especially on the inside in the neighbor- 

 hood of the basis ; on the outside is a row of black bristles, which 

 reaches from the basis as far as the middle. Hind tarsi not strong, 

 much shorter than the tibia?, the first joint longer than the follow- 

 ing ones taken together. Tegulae with a black margin and with 

 black cilia ; the halteres in both sexes brown -black. "Wings gray- 

 ish hyaline, with the usual two blackish transverse bands, which 

 are very extended and diffused, and as they unite again upon the 

 fourth longitudinal vein, they enclose an almost square, not sharply 

 defined, hyaline spot, in the first cell of the posterior margin ; the 

 dark coloring begins in the male on the anterior margin of the 

 wing, already before the end of the first longitudinal vein, in the 

 female somewhat beyond it, and extends in all specimens as far as 

 the end of the third longitudinal vein. The posterior transverse 

 vein, which is long and but little inflected, has a very oblique 

 position ; the anterior branch of the fourth longitudinal vein forms 

 with it an angle of scarcely sixty degrees, and turns afterwards at 

 a very much rounded right angle towards the tip of the wing 

 Hab. Brazil. 



9. guttula Wied. Of this species there is a well-preserved pair in Wiede- 

 mann's and another in Winthem's collection. Wiedemann's state- 

 ment that this species is from Savannah, is a mistake, corrected by 

 himself, and replaced on the etiquette by "Rio Janeiro." In Win- 

 them's collection also, Brazil is mentioned as the locality. There- 

 fore this species must be stricken out from the list of North American 

 species. As Wiedemann's description is not sufficient, I give a more 

 accurate one as follows : — 



P. guttula Wied. % and J .—Obscure seneo-viridis, capite, scutello 

 et thorace postico interdum violaceis, abdomine cupreo, in apice viola- 

 ceo, in basi plerumque viridi, facie nuda, pedibus simplicibus, obscuris, 

 alarum fasciis duabus nigris valde dilatatis, antice conjunctis et postice 

 abbreviate, in vena, longitudinali quarta confluentibus, ita ut guttata 

 hyalinam majusculam includant. 



% . Tibiis obscure piceis, halteribus ex fusco nigris, abdomine nigro-fas- 

 ciato, appendicibus hypopygii minuti parvis, nigricantibus. 



