396 



Orthorrhapha brachycera. 



elongated triangular, pointed, arista near Ihe apex; the antennæ are 

 yellow, the third joint a little brownish, especially towards the apex. 

 Thorax and scutellum æneous or greenish, densely grey or greyish 



Fig. 126. Antenna of B. bicolorellum (S, from the inside. X 100. 

 From a dried object. 



brown pruinose, dull. Pleura slightly æneous, grey pruinose, hypo- 

 pleura somewhat yellowish; propleura with fine, white hairs. Abdomen 

 yellow, more or fewer of the posterior segments (in my sole male the 

 three last) with indefinitely bordered dark brown, transverse bands 

 towards the front margin; sometimes abdomen quite yellow; it is 

 clothed with short, blackish hairs, and has short hindmarginal bristles, 

 long on the first segment. Venter yellow, with pale hairs. Legs yellow, 

 tarsi a little darkened towards the end. The legs have short, blackish 

 hairs, coxæ pale-haired ; the posterior coxæ each with a black bristle ; 

 the anterior femora have distantly placed, fine, longish hairs below, 

 most obvious on the middle femora ; posterior femora with a preapical 

 bristle; front tibiæ with a dorsal bristle, middle tibiæ with three 

 antero-dorsal, one postero-dorsal and one antero-ventral bristle; hind 

 tibiæ with two rows of dorsal, and a pair of small ventral bristles. 

 Wings a little yellowish tinged ; veins brownish. Squamulæ pale yellow, 

 with a yellow fringe. Halteres yellow\ 



Fig. 127. Antenna of B. bicolorellum 9, from the inside. X 100. 

 From a dried object. 



Female. Frons somewhat bluish ; epistoma somewhat broad, greyish 

 white. Antennæ short, third joint not ionger than broad, rounded 

 in front. Thorax somewhat less densely pruinose than in the male. 



Length 2,5—2,7 mm. 



