192 (August, 1909 



85 (86) Winffs with a large contal stigma. 



? . Thorax reddish-yellow, abdomen entirely black or brown, with the belly and 

 back of 6th segment yellow, 3rd and 4th segments abbreviated, the 3rd being 

 produced at the sides and overlapping the 4th ; frons black, about one-third 

 broader than long, under pair of supra-antennal very small, antennae brown ; 

 wings yellowish, stigma brown, filling nearly the whole of the 1st costal cell, 

 and extending in the male (Becker, I. c.) to the end of the 2nd cell, costa well 

 beyond middle of wing ; legs yellow, hind femora darkened at tip ; halteres 

 yellow 2 mm. costalis, v. Ros. 



86 (85) Wlngn ivitliout a stigma. 



87 (06) Halteres black, or duskg yellow {angusta, var.). 



88 (93) Anal organ of male minute and papilla-like. Costa of female (tiimida 



and denotata) swollen. 



89 (90) Antennsa of ordinary size. Costal fringe very long. Male hypopyginm 



tuithout bristles. 

 ? (J. Thorax and abdomen black; frons about three-fourths broader than long, 

 under supra-antennal bristles about half as large as the upper (^), one-fourth 

 as large (?), palpi muddy yellow or brown; wings light yellowish-brown, 

 costa well beyond middle of wing, especially in female, 1 equal to 2 + 3 ( J ) 

 to 2 only ( ? ), angle at fork longish — in male especially, 1st thin vein leaves at 

 a little beyond the fork with a fairly bold curve {$) and a bolder ( ? ), the 

 thickening of the female costa moderate but distinct and most pronounced near 

 the insertion of the 1st thick vein; legs dark brown or (<J ) almost black ; 

 male abdomen long and slender, as in rufipes, but with an unusually blunt or 

 truncated appearance, due to the minuteness of the anal organ and the 

 retracted condition of the hypopygium, Ihe latter in the rare exposed con- 

 dition is shorter than the 6th segment, but equal to it in breadth and depth, 

 and with a few erect hairs on the sides, ventral plate dusky yellow, reaching 

 to the end of the hypopygium 1^ — 2 mm. tutnida, n. sp. 



90 (89) Antennx very small, more than half hidden beneath the frons. Fringe only 



moderately long. Hypopygium with bristles underneath, hence fully 

 exposed. 



91 (92) Antennse black. A medium sized species (Ij mm. or more). 



S 9 . Very like tnmida, the female especially so. Besides the smaller antennae 

 and shorter costal fringe, other differences separating it from that species are 

 the minute size of the lower pair of supra-antennal bristles, the dusky wings, 

 the shorter costa, reaching barely the wing middle in the male, and its great 

 thickness in the female, conspicuous in all positions and rising almost into a 

 hump near the insertion of the 1st thick vein, whilst the 1st thin vein leaves 

 at flie fork, and with only a gentle curve in both sexes ; further, the grey 

 hypopygium is fully exserted, and altogether larger, equalling in length the 

 6th segment, and, in addition to the erect hairs on the sides, with a pair of 

 bristles at each under corner, placed very close together and almost touching, 

 whilst the ventral plate is comparatively short, and reaches only to the middle 

 of the hypopygium li — Ij mm. denotata, n. sp. 



