258 Orthorrhapha brachycera. 



greyish pruinose ; postocular hairs black or blackish. Antennæ black, 

 not as long as the head, the third joint somewhat longer than the 

 two basal; arista longer than the antennæ. Thorax dark green and 

 dark pruinose, slightly shining; humeri greyish; in the middle two 

 approximated, blackish stripes, disappearing behind. Pleura dark 

 green, a little dark greyish pruinose; propleura with blackish hairs. 

 Abdomen dark green, somewhat whitish grey pruinose, with narrow, 

 black incisures; it is clothed with short, black hairs, at the sides of 

 the three first segments longer and pale hairs; there are hindmarginal 

 bristles, long on the first segment. Venter greenish, grey pruinose, 

 with pale hairs, which are long towards the base. Hypopygium black, 

 a little greyish pruinose; posterior ventral lobes long, styliform with 

 the apex curved a little downwards, brownish black; the outer lamellæ 

 forked, with the dorsal branch long, the ventral short; they are brown 

 or brownish black, with long, but not dense hairs at the margin. 

 Legs black, coxæ dark grey pruinose, the knees very narrowly reddish, 

 and the hind tibiæ reddish or brown in the middle; the middle coxæ 

 with a strong, black apical spine, more or less cleft at the apex; front 

 tarsi with metatarsus as long as the foUowing four joints, on the 

 middle tarsi a little shorter, hind metatarsus slightly longer than the 

 second joint. The legs have short, black or blackish hairs; the coxæ 

 are long-haired, the hairs on the hind coxæ partly pale; front femora 

 with long hairs on the posterior side, middle femora below% and with 

 some bristles at the apex; hind femora shorter haired below, but 

 with a long fringe on the postero-ventral side; tibiæ with two rows 

 of long bristles above, middle tibiæ with a similar row below, and 

 hind tibiæ with small bristles below; front metatarsi short spinulous 

 on the postero-ventral side and with long hairs at the apex; middle 

 metatarsi with scattered spinules below. Wings slightly greyish brown 

 tinged; veins black, discai vein with an even curve. Squamulæ yel- 

 lowish or brownish yellow, with a black fringe. Balteres yellow. 



Female. Colour generally lighter than in the male or more æneous, 

 thorax paler pruinose, and the stripes more distinct. Frons somewhat 

 greyish pruinose. Epistoma broad, grey; palpi large, grey. Postocular 

 hairs white below. Antennæ short, third joint not as long as the 

 two basal, almost not longer than broad; arista distinctly twice as 

 long as the antennæ. Legs generally with the knees and the basal 

 half of the hind femora yellow ; anterior tibiæ and base of tarsi yel- 

 low, hind tibiæ yellow with base and apex blackish ; the legs short- 

 haired, front coxæ pale-haired with some black bristles at the apex; 

 middle femora with some bristles at apex on both sides, middle coxæ 

 without spine, but with a slight, dark fringe. Front metatarsus about 



