234 Orthorrhapha brachycera. 



of the antennæ. Thorax dark metallic green, sornetimes somewhat bluish, 

 often with two faint darker stripes in the middle ; it is a little greyish 

 pruinose, and generally somewhat whitish at the humeri, shining; the 

 thoracic disc somewhat densely hairy. Scutellum with somewhat longish 



Fig. 74. Antenna of A. diaphana c?, from the inside. X o5. 



hairs above; pleura grey, slightly greenish or æneous; prothoracic 

 bristles strong, black. Abdomen somewhat metallic green, first segment 

 greyish black, the rest densely covered with a silvery pruinosity; the 

 second and third segments with a large, yellow, translucent spot at 

 each side, the spots on the third segment may be indistinct or quite 

 wanting; abdomen clothed with somewhat longish, black hairs, and it 

 has long hindmarginal bristles, longest on the first segment ; eighth 

 segment with dense hairs, and some longer bristles at the apex. 

 Venter grey, with black hairs, long at the base and at the hind margins. 

 Legs black, coxæ somewhat greyish; anterior femora with the apex, 

 and the anterior tibiæ yellow, hind tibiæ yellow, blackish at base and 

 apex; anterior tarsi brownish or blackish towards the end, hind tarsi 

 blackish, sometimes with the basal joint paler; hind metatarsus shghtly 

 longer than the second joint. The legs have short, black hairs, the 

 anterior coxæ densely bristly anteriorly; hind coxæ with a row of 

 bristles on the outer side; anterior femora with long, bristly hairs 

 below, longest on the middle femora; hind femora with longish hairs 

 both above and below; front tibiæ with some bristles above, middle 

 tibiæ with two dorsal rows, and some smaller ventral bristles, hind 

 tibiæ likewise with two dorsal rows; front metatarsi with a ventral 

 row of long bristles. Wings almost hyaline, or a little brownish tinged ; 

 veins blackish; the bend of the discai vein somewhat large, lying 

 nearer the cross-vein than the apex. Squamulæ dirtily whitish, with 

 a black margin above and a long, black fringe. Halteres pale yellow 

 or whitish. 



Female. Vertex and frons greyish white; eyes with whitish hairs; 

 postocular hairs white below. Antennæ shorter than in the male, third 

 joint about as long as broad. Epistoma broad, grey ; palpi large, grey. 

 Thorax greyish white all about the humeri; the disc and the scutel- 



