170 (August, 



6* ?. Thorax and scut ell um yellow or reddish ; frons reddish, more or less clouded 

 with grey, third joint of antenna? orange ; hind femora fringed underneath 

 with long black hairs ; abdomen black with broad yellow hind margins to 

 segments, belly more or less yellow; lamellae of hypopygium very long and 

 rather narrow 3 mm. meigeni, I'.eck. 



9 (8) End of anal protuberance without such spurs, first abdominal segment of 

 female entire/// black. 



o* V . Variable in colour. Thorax and abdomen black, the former sometimes with 

 a reddish tinge, or yellow (Becker) ; frons grey with a yeltowish band above 

 insertion of antennae, inner bristle of lower frontal row not so directly under- 

 neath outer one as in the others, third joint of antennae black, sometimes orange 

 in female j hind femora with only ordinary hairs; hypopygium mainly whitish, 

 lamella; of moderate size and pointed ; ovipositor dirty white, contrasting with 

 the black abdomen 2 — 2£ mm. girandi, Egg. 



10 (5) Cilia on middle and hind tibise in a single row — inside the seam (normal). 



11 (26) Halteres clear yellow, or dusky yellow (emarginata) . 



12 (17) Meso-pleurve bristly (bristles all equal or nearly so in size). 



13 (1-1) Costa not much more than f the wing length ; Jringe short. 



? . Thorax yellow or red ; abdomen black, yellow underneath ; frons nearly half 

 as broad again as long, grey with a narrow yellow margin over the antennae, 

 one pair of small supra-antennal bristles, antennae very small and dusky red, 

 arista shorter than usual (not half as long again as length of frons), palpi 

 yellow ; wings tinged with yellow, 1 twice as long as 2, first thin vein recurved 

 slightly at margin ; legs yellow, hind femora moderately stout, with a black 

 spot at the tip and fringed below on the inner half with long hairs, tibial cilia 

 strong and rather numerous ; ovipositor exserted, large and black... 



lj mm. rufa, n. sp. 



14 (13) Costa at least to middle of wing ; fringe long. 



15 (16) Palpi of male very large and nearly bare. Fore tarsi thickened in both 



sexes. 

 $ ? . Very variable in colour. Thorax usually black, often tinged with red 

 sometimes quite red or yellow in female ; abdomen black, except in the pale 

 females, in which it is mainly yellow with the dorsum suffused with reddish- 

 grey ; frons black, rather broader than long, under pair of supra-antennal 

 bristles half the size of the large upper pair, antennae small and black, palpi 

 yellow, sometimes dusky (^), yellow and rather large but of ordinary form and 

 clothing ( ? ) ; wings lightly tinged with brownish-yellow {$) more deeply ( ? ), 

 veins yellow and fringe moderately long, costa to middle of wing ( $ ) beyond 

 middle ( ? ), 1 twice as long as 2 (6* ) barely half as long again ( y' ), first thin 

 vein not or scarcely recurved at margin ; legs yellow, hind femora dilated with 

 the tip darkened, tibial cilia strong ; hypopygium moderately large, the sub- 

 anal body usually concealed, when not, a yellow flap-like ventral process is also 

 exposed, the yellow anal protuberance of moderate size ; ovipositor not 

 exserted 1J — 2£ mm. projecta, Beck. 



