in the British Museum. 31 



scutal lobes reddish brown, scutellum dark brown; postnotum 

 dull yellow, dark brown medially. Pleura with the dorso- 

 pleural membranes dull yellow; a broad conspicuous, brown 

 to dark brown dorsal stripe, continued from the prosternum 

 to the base of the abdomen ; immediately beneath this stripe 

 is a slightly narrower, light yellow stripe passing immediately 

 above the coxal bases ; sides of the mesosternum deep 

 reddish, the median area light yellow, with a deep median 

 impressed line. Halteres dark brown. Legs with the coxae 

 reddish; trochanters dull yellow; femora dull yellow, the 

 tips indistinctly brownish ; tibiae yellowish brown ; tarsi 

 brown. Wings long and narrow, with a strong greyish- 

 yellow tinge, the stigma indistinct; veins brown. Venation: 

 Sc long, ending opposite to the fork of Rs, Sc 2 some distance 

 from the tip of £c l5 so that it lies just beyond mid-distance 

 between the origin of Rs and the tip of Sc x ; Rs long ? slightly 

 angulated at origin ; R 2+i about two-fifths the length of Rs, 

 r at its fork ; cell R 2 very long and narrow ; the very short 

 basal deflection of i? 4+5 is almost in direct alignment with 

 both Rs and R i+5 ; r—m about twice r ; cell 1st M 2 very long 

 and narrow, widened distally, a little longer than vein Cui 

 beyond it; basal deflection of Cu x at the fork of M ; 2nd 

 Anal vein almost straight, cell 1st A consequently widest at 

 the wing-margin. 



Abdomen brownish yellow. Male hypopygium with the 

 pleurites moderately elongated, the inner face concave ; two 

 short, shiny black appendages, the dorsal one about twice as 

 large as the ventral. The female has the valves fleshy or at 

 least not strongly chitinized as in most species of the genus ; 

 the tip of the abdomen is abruptly narrowed, viewed from 

 beneath with the tip feebly bilobed. 



Hah. Cape Colony. 



Holott/pe, $ , Cape Town, September 7. 



Allotopotype, ? , October 9. 



Type in the collection of the British Museum (Natural 

 History). 



This fly would seem to be one of the aberrant members of 

 the genus Erioptera, though it is possible that more material 

 would necessitate its removal from this group. 



Erioptera nigrolatera, sp. n. 



Head black, heavily light grey-pruinose ; mesonotal prse- 

 scutum with a broad grey median stripe, the broad lateral 

 stripes sooty black; legs brown clothed with conspicuous 

 erect hairs ; wings dusky grey ; cell 1st M 2 open by the 

 atrophy of m, Anal veins divergent ; abdomen hrownish 



