Chrysogaster. 105 



pruinose transverse band below Ihe antennæ; for the rest dullish, but 

 polished in the middle above the ralher protruding mouth edge, which 

 projects more than the antennal projection. Vertex with long, yellowish 

 hairs, dark in front; frons with short, pale hairs and epistoma incon- 

 spicuously haired, Occiput black, grey pruinose along the margin, 

 with short, pale hairs, longer on the jowls. Antennæ short, third joint 

 roundish quadrate; second joint with long, whitish bristles below; the 

 antennæ are black or brownish black. Thorax æneous green, some- 

 what dull as it is very densely punctate, it has very faint or almost 

 no stripes and is clothed with short, soraewhat depressed, yellowish 

 hairs; scutellum is more bluish black, with dark hairs; it is marginate 

 and with a slight transverse depression on the middle. Pleura less 

 punctate, shining, with slighlly longer hairs. Abdomen dull black on 

 the disc, æneous and shining at the sides and apex ; it is clothed with 

 short hairs, chiefly dark on the disc, pale at the sides and longer at 

 the basal corners. Venter greenish, shining, with pale hairs. Genitalia 

 somewhat large. Legs black, femora a little æneous; hind metatarsus 

 a little thickened ; the legs are inconspicuously pale-haired, hind femora 



Fig. 44. Antenna of O. brevicornis 9, from the inside. X 80. 



black setulose beneath. Wings slightly tinged; stigma brownish and 

 below it a somewhat indistinct brownish cloud; upper marginal cross- 

 vein about perpendicular but curved out in the middle. Squamulæ 

 yellowish white with a yellow fringe. Plumula darker than in the 

 other species. Halteres whitish yellow. 



Female. Frons very broad, with a depressed middle stripe and 

 in front of it a dot-like impression; on each side a number of cross- 



