February, 1900.] 25 



wings tinged with grey, sometimes strongly, veins yellowish-brown or brown, costa 

 to middle of wing, 1 nearly twice the length of 2 ; legs yellow, tinged with 

 brown, tibial cilia small and numerous ; hypopygium large, subanal body con- 

 cealed, the yellow ventral process large and flap-like and always visible, anal 

 organ large and yellow, and not depressed Ig mm. arinata, n. f!p. 



8 (7) The branch joins at a much larger angle — nearly a right angle. 



9 (10) Cilia on hind tibias distinct. Bleso-pletirx with one bristle much longer 



than the rest. A moderate sized species. 

 $ 9 . Thorax and abdomen black ; frons dull nearly one-third broader than long, 

 inner bristle of lower frontal row unusually close to and at a lower level than 

 the outer one, supra-antennal bristles large, upper pair unusually wide apart 

 standing distinctly outside a vertical line dropped from the inner bristle of 

 middle frontal row instead of rather inside it (normal), under pair usually 

 close to the middle line and low down, generally hidden between the antennae 

 ((?) but more plainly visible (9), antennae large ((?), of ordinary size ( ? ), 

 palpi dusky yellow, small, but with strong bristles ; wings grey, with blackish 

 veins, costa to middle of wing, 1 twice as long as 2 usually, but rather variable, 

 angle at fork large, first thin vein slightly recurved at margin ; legs yellow, 

 smirched with grey, fore tarsi rather stouter than ordinary, hind femora fringed 

 below with fairly long hairs, tibial cilia of fair size ; hypopygium large and 

 knob-like, with a long bristle on either side underneath, subanal body usually 

 exposed and very large, ending in a black hooked process with a shorter and 

 broader one at its base, ventral process minute and dusky yellow, anal organ 

 large and yellow, rarely black 1 — li mm. rudis, n. sp. 



10 (9) Hind tibise bare. Pleural bristles all small. A small species. 



(J 9 . Thorax and abdomen black ; frons rather broader than long, four equal 

 supra-antennal bristles, the upper pair wider apart than the under, antennae small, 

 palpi yellow ; wings nearly clear, veins dark, costa distinctly less than half the 

 wing length ( (? ), but nearly half ( ? ), otherwise venation as in rudis ; legs from 

 yellow to brown, or even dark brown ; hypopygium large and knob-like, almost 

 globular when fully protruded, subanal body short and broad, ventral process 

 dusky yellow and flap-like, but generally lying close up against tlie hypogygium 

 and invisible, anal organ small, Jdusky yellow or^blackish... 



5 — J mm. affinis, n. sp. 



11 (4) Frons not as broad as long ; moderately shining. 



<? ? . Thorax and abdomen deep black, meso-pleurae with one bristle very much 

 longer than the rest ; frons distinctly narrow, supra-antennal bristles nearly 

 equal, palpi yellow; wings grey, darker in ? than $, costa moderately long 

 (<J), about to middle of wing ( ? ), 1 equal to 2 + 3; legs blackish-brown or 

 deep black, fore legs paler, and fore coxae clear yellow, tibial cilia very large and 

 at wide intervals, hind femora dilated ; fourth abdominal segment of female 

 much abbreviated, being half the size of the one on either side of it, $ abdomen 

 short and stout, hypopygium very small, usually concealed, anal organ very 

 small, dusky yellow 1 — Ij mm. ciliata, Zett. 



12 (3) Halteres clear yellow. 



13 (14) Legs black. Costa distinctly short of the middle of the wing. 



