2 PROCEEDINGS OF THE NATIONAL MUSEUM vol.65 



dent punctures. The width at humeri is to the length to scutellar 

 suture as 23 to 29, by micrometer. Scutellum on its flat upper surface 

 with pale hairs like the mesonotum, but more strongly punctured; 

 at the tip are two parallel bristles and on each side two or three small 

 hairs, all arising from veiy minute, microscopic denticles. Halteres 

 white, stem yellow. 



Abdomen narrow and tapering, the apex curved downward; the 

 first and second segments pale yellow above except at the sides, the 

 following three wholly black, the sides of all but the first with long, 

 silky, whitish hairs, the second also bears black spiny hairs at the 

 side. Venter membraneous, whitish. 



Legs mostly yellowish, but the hind femora and tibiae and the 

 apices of all the tarsi are black or blackish, and the front femora and 

 tibiae are slightly infuscated. The front femora are thickened, and 

 have long pale hair below; the front tibiae have a heavy fringe of 

 brownish hair on the outer hind side, which extends on the first 

 and second tarsal joints. The hind femora are large, greatly thick- 

 ened and curved; their tibiae are rather stout and have on the outer 

 front side numerous long curled pale hairs extending foi-ward, over- 

 lapping the femora in the flexed position. 



Wing hyaline, normal, fourth vein reaching the margin barely 

 behind the apex. 



Female. — ^Head and thorax as in male; the pale spot at base of 

 abdomen is smaller though distinct, leaving a wider black margin 

 at sides. The abdomen and legs do not have the long yellow hair 

 characteristic of the male; the front femora are yellow and hardly 

 thickened at all. The hind femora, however, are almost as large as 

 in the male, the hind tibiae as in the male; the hind tai"si black ex- 

 cept the contrasting yellow basal joint. 



Length of male 4 mm., of female 3.2 mm. 



Described from one male and three females received from Profes- 

 sor Moreira as stated above. 



T^y^e.— Male, Cat. No. 26487, U.S.N.M. 



Two paratypes are returned to the sender for preservation in a 

 Brazilian museum. 



