530 Syrphidae. 



narrowly orange, and generally also the hind margin of third segment 

 in the middle. Abdomen is clothed with exceedingly short hairs which 

 mainly follow the ground colour, but are somewhat pale at the sides 

 and apex of fourth segment; they are not longer at the sides, but the 

 basal corners have a tuft of long, white hairs. Genitalia yellow-haired, 

 the outer lamellæ with the apical part yellow. Venter yellowish with 

 the base and the fourth segment blackish: it is almost bare with only 

 few longish hairs at base and on fourth segment. Legs black and 

 yellow ; anterior femora yellow with a larger or smaller black spot on 

 the posterior or upper side, generally stretching from near the base 

 to near the apex; sometimes a similar but smaller spot below, and 

 sometimes the spot is rather faint; anterior tibiæ with the apical half 

 or two thirds brown or blackish, sometimes only above; anterior tarsi 

 yellow; hind femora black with the base and a dorsally interrupted 

 middle fascia yellow; hind tibiæ black with the base and a ring in 

 the middle yellow, and hind tarsi black; the hind femora are ex- 

 ceedingly thickened and somewhat compressed, below they have a 

 row of quite short spines on about the basal two thirds; the apical 

 third bends abruptly up to the apex, it has towards the anterior side 

 an edge with a row of dense, short spines and towards the posterior 

 side a row of few, about four, longer spines ; the hind tibiæ are curved, 

 with a sharp edge below, interrupted in the middle; hind metatarsi 

 a little thickened; the legs quite short-haired, only middle femora with 

 long hairs behind and hind femora with a row of few long, white, 

 bristly hairs below on the basal part; the hairs are pale; hind tibiæ 

 almost quite bare only with a row of fine, distant, erect hairs below. 

 Wings clear; stigma slightly yellowish to pale brown; cubital vein 



Fig. 175. Wing of S.pipiens c?. 



curved a little downwards above the middle of the first posterior cell; 

 middle cross-vein not oblique, on the middle of the discai cell; upper 

 marginal cross-vein undulated, Squamulæ with their fringes, and the 

 balteres whitish. 



Female. Vertex somewhat narrow, widening down the frons; the 

 vertical space black, the rest greyish or yellow to brownish pruinose 



