1909.] 119 



than long ( <? ) less ('^),4 large and equal supra-antennal bristles, the under 

 pair much closer together than the upper, paljji of ordinary shape but large and 

 conspicuous and of a clear yellow ; wings nearly clear and veins dark, costa 

 rather beyond the middle of wing, fringe only moderately long, 1 rather longer 

 than 2 but shorter than 2 + 3, angle at fork moderate, Ist thin vein leaves at 

 the fork almost without a bend and is slightly recurved at the margin ; legs 

 blackish-brown, hind femora stout and fringed below on the basal half in both 

 sexes with a few long hairs, hind tibiiE well arched along the dorsal edge and 

 the cilia very strong ; hypopygium of medium size, often partially withdrawn 

 within the 6th segment and witliout bristles, the ventral plate small and yellow, 

 and the stout and I'ather shoi't anal organ yellow or dusky yellow... 



2 mm. frontalis, n. sp. 



75 (74-) Ralteres yellow. 



76 (77) Inner bristle of lower frontal roio close to the eye margin and in vertical 



line with the outer one. 

 $ . Thorax and abdomen black, the former tinged with red and with the humeri 

 obscurely yellowish ; frons dull, not broader than long, supra-antennal bristles 

 large, the upper pair unusually wide apart, filling in as it were the gap left by 

 the displacement of the frontal bristles, antennae rather small, palpi very pale 

 yellow, almost whitish ; wings well tinged with yellowish-brown, fringe only 

 moderately long, 1 nearly half as long again as 2, angle at fork moderately 

 large, 1st tliin vein as in frontalis; legs yellow, hind femora stout and 

 darkened towards apex, tibial cilia fairly strong ; hypopygium rather small and 

 usually more or less retracted within the 6th segment, ventral plate small and 

 yellowish, and the yellow anal organ stout and rather short... 



Is mm. infraposita, n. sp. 



77 (7'i) Inner bristle of loioer frontal row in its usual position. 



78 (79) Supra-antennal bristles large and nearly equal. 



<J ? • Thorax and abdomen deep black ; frons about \ broader than long, palpi 

 a muddy yellow ; wings lightly tinged with brown, costa barely to middle of 

 wi"g (<?) quite so (?), 1 longer than 2 and about equal to 2 + 3, but the 

 proportions rather variable, angle at fork moderate, Ist thin vein rather gently 

 curved at its origin and thence nearly straight to the margin ; legs dark brown, 

 almost black, tibial cilia somewhat small and numerous but of distinctly bristly 

 character ; male abdomen stoutish, hypopygium of medium size with a slender 

 bristle or stout hair at each lower corner and numerous longish hairs on the 

 sides, ventral plate yellow, narrow and pointed, the yellow anal organ short and 

 stout practically filling the posterior outlet of the hypopygium... 



If — 2^ mm. vernalis, n. sp. 



79 (78) Supra-antennal bristles unequal, the under pair less than half as large as 



the upper. 



80 (81) First and second costal divisions nearly equal. 



S ? . Thorax dusky red to almost black, the female as a rule the darker ; abdomen 

 black, ils 2nd segment lengthened in male and furnished in both sexes with 

 bristles on the sides as in rufcornis ; frons black and of ordinary proportions 

 (about \ broader than long), upper supra-antennal bristles fairly large, under 



