1908.] 171 



1(> (15) Palpi of ordinary size. Fore tarsi not thickened. 



£ . Thorax and abdomen black ; frons black, about one-fourth broader than long, 

 four large and equal supra-antennal bristles, antennae small, palpi dull yellow, 

 armed with very large bristles j wings light yellowish-brown, veins brown and 

 fringe very long, costa to middle of wing, 1 not half as long again as 2, first 

 thin vein comes off at the fork with a gentle curve and pursues a straight course 

 to the margin j legs dark brown, hind femora dilated, tibial cilia large and 

 sparse ; hypopygiuin much as in projecta, but anal protuberance longer... 



2 nun. dubitalis, n. sp. 



17 (12) Meso-pleurae bare. 



18 (19) Second thick vein widely dilated <ts far as the fork in the male, and thence 



rapidly narrowing, in the female simple. Palpi in both sexes unusually 

 pale, almost white. 

 $ ? . Thorax black with an obscure reddish tinge, humeri yellow and pleura; 

 obscurely so; abdomen black, dusted with grey; frons very much dusted 

 with grey, nearly twice as broad as long, four large and nearly equal supra- 

 antennal bristles, antennae bright orange with a dusky spot below the insertion 

 of the arista, small in male but occupying nearly whole of the joint in female ; 

 wings lightly tinged with yellowish, veins black and fringe very long, costa 

 rather beyond middle of wing, 1 twice as long as 2 ; angle at the fork very 

 acute ; legs yellow, hind femora dilated, with a dusky spot at the tip and 

 fringed below with long hairs, which are longest on the outer half, tibial cilia 

 large ; hypopygiuin of moderate size, anal protuberance very small, hind margin 

 of last abdominal segment (<J) encircled by about eight long bristle-like hairs 

 at regular intervals 2 mm. cubitalis, Beck. 



19 (18) Second thick vein normal. Palpi not unusually pale, yellow. 



20 (21) Costa very long (well beyond the middle), first costal division shorter than 



the second. A row of bristles on the dorso-lateral region of second 



abdominal segment in both sexes. 

 tJ $ . Variable in colour. Thorax from a rusty yellow or dusky red to black ; 

 abdomen black ; frons about half as broad again as long, dusted with grey, 

 under pair of supra-antennal bristles not half the size of upper, antennae black, 

 sometimes red ; wings deeply tinged with yellowish-brown, veins yellow, fringe 

 rather short ; legs yellow, hind femora stout, dusky at tip, tibial cilia sparse 

 and very strong ; a few bristle-like hairs round the margin of the last abdominal 

 segment in both sexes, hypopygiuin large with a large and yellow anal pro- 

 tuberance, the subanal body (usually concealed) is small, and a small and 

 simple ventral process, yellow in colour, is also present... 



2 mm. ruficomis, Mg. 



21 (20) Costa moderately long, at the most {albicans ? ) slightly beyond the 



middle; first costal division twice or nearly twice as long as the 

 second. iVo bristles on second abdominal segment. 



22 (23) Halteres dusky yellow. Abdomen not dusted icith grey. 



<J ? . Thorax and abdomen black ; frons black, about twice as broad as long, but 

 scarcely as much ( ? ), upper pair of supra-antennal bristles large, under pair 



P 2 



