142 Orthorrhapha brachycera. 



middle, broad at the sides and here reaching nearly or quite over 

 the whole segment, thus each segment has a transverse, triangular 

 or more romided black spot lying towards the front margin; the yel- 

 lowish bands become broader on each successive segment towards the 

 apex, and thus the black spots become smaller; the last two segments 

 are nearly quite yellowish. The hind margins of the segment are 

 bright yellow. Abdomen clothed with long, bright yellow or more 

 reddish yellow hairs, along the middle line there are black hairs to a 

 greater or less extent; towards the apex of the abdomen the black 

 hairs prevail. Venter grey with yellow hind margins of the segments, 

 somewhat sparingly clothed with long, yellow or pale yellow hairs. 

 Genitalia dark above, more or less ferrugineous below. Legs with the 

 coxæ grey, femora blackish grey, tibiæ yellow, more or less blackish 

 at the apex, tarsi yellow, black towards the apex. Coxæ and anterior 

 femora with long, yellow or pale yellow hairs which on the femora 

 may be more or less intermingled with black, sometimes to a great 

 extent; hind femora with somewhat depressed, yellow hairs. Wings 



Fig. 46. Wing of T. nohilitata. 



somewhat greyish yellow; stigma yellow; veins yellow to brown; fourth 

 posterior cell closed. Halteres dark brown, the peduncle yellow. 



Female. Vertex and frons yellow pruinose; the frontal cailus 

 reaching from one eye to the other, it has a triangular excision in 

 the middle of the lower margin, the upper margin is produced up- 

 wards in the middle, but it does not reach the ocellar tubercle. The 

 hairs on frons and face shorther than in the male, those on the frons 

 black. The hairs on thorax much shorter than in the male, they are 

 black, erect and golden yellow, depressed. Abdomen as in the male, 

 but the black spots often somewhat hidden under the depressed hairs, 

 and then appearing smaller on the first segments. The first four 

 segments with depressed, golden yellow hairs, only somewhat erect 

 at the sides, the last segments with short, erect, yellow hairs, which 

 on the sixth segment are partly or quite black ; on the fourth segment 

 there are both erect and depressed hairs; the seventh segment 

 shining black, with black hairs. Venter with long hairs on the basal 

 part, shorter towards the apex. The hairs on the femora short. 



