52 Orthorrhapha brachycera. 



first two joints; the first joint four times as long as the second, the 

 tiiird slightly longer tiian the first two together. Thorax black, slightly 

 shining and with a slight violet tinge; in front of the humerus a greyish 

 pruinose spot. The thoracic disc is sparingly clothed with somewhat 

 short, yellowish hairs and with longer, erect, blackish hairs which are 

 longest behind, Scutellum with yellowish hairs and long, black mar- 

 ginal bristles. On the thoracic disc there is a præsutural bristle and 

 a gronp of supraalar and postalar bristles, all black. Pleura black, 

 slightly greyish pruinose and with somewhat long hairs which are 

 blackish above, white farther dovn, above the coxæ; the long hairs 

 on the metapleura are black above, yellowish below. Abdomen black, 

 shining, like the thorax with a slight violet tinge. It is clothed with 

 short, depressed, yellow hairs which give the impression of being 

 somewhat denser at the hind margins of the segments, especially on 

 the sides; they are long at the lateral margin of the first segment 

 but decrease in length backwards; at the lateral margins of the first 

 five segments there are some stronger, bristly hairs; on the sixth 

 segment the hairs are blackish in the middle. Venter black, sparingly 

 clothed with long, yellow hairs. The genitalia somewhat resemble 

 those in gilva^ but the upper forceps have not the flat prolongations; 

 the ventral lamella is much arched; there are long, black hairs on 

 the upper forceps and at the apex of the ventral lamella, the apical 

 styles of the ventral lamella have pale hairs. Legs black, somewhat 

 strong, the hind femora somewhat club-shaped; the legs are not 

 densely hairy; the shorter hairs on the dorsal side of the femora are 

 chiefly black, the longer hairs on the ventral side yellowish; the hairs 

 on the hind tibiæ are blackish, on the anterior tibiæ yellowish; long, 

 thin hairs are found especially on the ventral side of the hind tibiæ, 

 on the middle tibiæ except on the dorsal side, and on the ventral 

 and posterior sides of the front tibiæ; they are partly black, partly, 

 especially on the middle tibiæ, yellowish; stronger spine-like bristles 

 are found at the apex on the posterior side of the hind femora, on 

 the anterior side of the middle femora, and on the dorsal side of the 

 tibiæ; on tbe middle tibiæ they are long; they are generally all black. 

 The strong bristles on the tarsi are reddish and black. The dense 

 pubescence on the ventral side of the front tibiæ and at the utmost 

 apex on the posterior side of the hind tibiæ is bright reddish yellow, 

 as is also the dense pubescence on the under side of the tarsi. Glaws 

 black; empodium reddish. Wings yellowish hyaline on the basal half, 

 brown on the apical half; veins brown, costa at the base clothed 

 with white or yellowish hairs. Halteres yellow to reddish yellow. 

 Female. Chiefly agreeing with the male, only the wings less 



