140 Orthorrhapha brachycera. 



Male. Frons and face yellowish pruinose ; the hairs on the frons 

 for the most part black and down the cheeks and on the jowls of 

 the same colour, inwards, towards the mouth aperture, yellow. 

 Occiput yellow pruinose with yellow hairs ; occipito-orbital bristles 

 black, the hairs on the vertex black. Antennæ blackish, first joint 

 somewhat greyish yellow pruinose, the third joint more or less reddish 

 at the outermost base; first and second joint with black and some 

 yellow hairs. Thorax ashgrey or more brownish or yellowish, the 

 lighter stripes only faintly discernible; the disc is more or less spar- 

 ingly clothed with long, erect, black hairs, and densely with more 

 decumbent, yellow hairs. There are nearly always four distinct dorso- 

 central bristles, in one or two cases I found six, and once five (three 

 on one side). Sterna and pleura grey with pale yellow hairs. Abdo- 

 men yellow or greyish yellow, the hind margins of the segments more 

 or less bright yellow; it is densely clothed with yellow hairs which 

 may be of paler or deeper colour, sometimes nearly reddish yellow; 

 along the hind margin of each segment there is a row of black hairs. 

 Venter grey with the hind margins of the segments pale yellow, spar- 

 ingly clothed with pale yellow to whitish hairs. Genitalia more or 

 less reddish below\ Legs with coxæ and femora blackish grey, tibiæ 

 yellow, more or less blackish just at the apex, tarsi yellow, the tips 

 of the joints black and the two or three last joints quite black. 

 Coxæ and anterior femora with long, pale yellow hairs, more or less 

 intermingled with black towards the apex of the femora; hind femora 

 with depressed, pale yellow hairs. Wings hyaline, slightly yellowish 

 towards the anterior margin, with a yellow stigma; veins brown or 

 yellowish brown; the fourth posterior cell closed, Halteres brown, 

 the peduncle yellowish. 



Female. Vertex and frons yellowish pruinose ; the frontal callus 

 transverse, reaching from one eye to the other, distinctly incised U'i- 

 angularly in the middle of the lower margin, slightly arched above 

 and far from reaching the ocellar tubercle. The hairs on frons and 

 face shorter than in the male, yellow, only some black on the frons. 

 The black and yellow hairs on the thoracic disc much shorter than 

 in the male, and the yellow hairs quite depressed; the two lighter 

 stripes distinctly visible. The hairs on abdomen shorter and generally 

 paler than in the male; they are depressed on the dorsum of the 

 four first segments and only erect at the sides ; on the last segments 

 they are erect and very short, hence the front part of abdomen is 

 brighter and more shining yellow than the apical part ; on the fourth 

 segment there are both depressed and short, erect hairs; there are 

 no black hairs at the hind margins. The seventh segment is coloured 



