609 



is no specially individualised humeral or posthumeral bristle, 

 but a number of notoplural bristles, one or a couple of supraalar 

 and one postalar bristle ; the bristles are all black. Scutellum 

 concolorous with thorax, with about twelve black bristles. 

 Pleura greyish black pruinose, metapleura with long, black 

 hairs. Abdomen black, slightly greyish pruinose and some- 

 what shining, clothed with black hairs, longest at the hind 

 margins to the segments ; venter similarly coloured and haired. 

 The exterior genitalia rather large, consisting of two pairs of 

 lamellæ, both directed backwards and more or less upwards 

 especially the upper lamellæ; these latter show at the base a 

 forwards directed process, often more or less hidden, then fol- 

 lows a thinner, petiolated part and the upwards directed end- 

 part is somewhat spoonshaped; the lower lamellæ are of a 

 somewhat similar shape, but longer and more styliform though 

 flattened, they are directed more backwards and curve slightly 

 and evenly upwards; their basal part is shining, the end-part 

 chagreened; both pairs of lamellæ are black, the upper has 

 short, brownish hairs, the lower longer, black hairs; the eighth 

 ventral segment has long, black, bristly hairs, directed back- 

 wards; from the lowermost part of this segment issues the 

 penis; this latter forms a long and exeedingly fine, hair-like 

 thread of brownish colour ; it goes with a curve out to the end 

 of or between the lower lamellæ and is then strongly recurved 

 going back above or between the upper lamellæ. Legs black; 

 the femora with medium long hairs, longest below and rather 

 long below front femora ; all tibiæ with antero- and postero- 

 dorsal rows of fine bristles, strongest on hind tibiæ, and besides 

 with short hairs forming a fringe below; the hairs and bristles 

 black; front tibiæ and tarsi bearded from a brownish, some- 

 what long pubescense along the posterior side, and with a 

 short, dense pubescense below. Wings slightly tinged, veins 

 brown; stigma small, brown. Haltères blackish brown, 

 xxii. 39 



