468 MEMOIRS OF THE CARNEGIE MUSEUM 



Genus ORASEMA Cameron. 

 Orasema festiva (Fabricius). 



Euchatis festiva Fabricius, Syst. Piez., 1804, p. 157. 



Orasema festiva Kirby, Journ. Linn. Soc. London, ZooL, XX., 188G, p. 29. — Dalla 

 Torre, Cat. Hym., V., 1898, p. 361. 

 Brazil. 



Oeasema eapo (Walker). 

 (Plate XXXW., Fig. 5.) 



Eucharisrapo Walker, Monogr. Chalc, II., 1839, p. 66, 9. 



Orasema rapo Kirby, Journ. Linn. Soc. London, Zool., XX., 1886, p. 26. — Dalla 

 Torre, Cat. Hym., V., 1898, p. 361. 

 Brazil : Chapada, in April ; Santarem ; Corumba, in May. Fifteen specimens. 



PSEUDOCHALCURA Ashmead, gen. nov. 



This genus resembles Gltalcura Kirby, but the wings are hyaline, 'without a fus- 

 cous spot, and the antennte, in the male, have only four branches. 



PSEUDOCHALCURA NIGROCYANE.i, Sp. noV. 



(Plate XXXIV., Fig. G.) 



Male. — Length 3.5 mm. Blue-black, coarsely, reticulately punctate, with a 

 faint seneous tinge above, the trochanters, apices of femora and all tibse and tarsi, 

 and the scape and pedicel of antennae honey-yellow, the flagellum brown-black or 

 brown, paler towards apex, joints one to four each with a long branch above. The 

 abdomen is Eeneous black, with a very long petiole, the length of the hind femora, 

 the body subcompressed, viewed from the side subtriangular. 



Female. — Length about 4 mm. Agrees fairly well with the male except that 

 the flagellum is brown, joints one to four acutely lobed above, while the abdomen 

 is larger, the petiole much shorter, being hardly two thirds the length of the hind 

 femora. 



Brazil : Chapada, in April. Six specimens. 



Genus STIBULA Spinola. 



Stibula nigriceps, sp. nov. 



(Plate XXXV., Fig. 2.) 



Male. — Ivcngth 3 mm. Brownish-yellow, the head, except the eyes which are 

 brown, being entirely black ; the flagellum from the second joint is brown-black, 

 the scape, pedicel, and the first joint of the flagellum being yellow ; the first joint 

 of the flagellum is very long, more than twice as long as the scape. 



