350 Syrphidae. 



more æneous above, the hairs white, slightly yellowish above; about 

 the middle they are rather coarse and silvery. Antennæ yellow, third 

 joint more or less brown above. Thorax æneous, shining, especially 

 towards the sides; it has two approximated, grey lines in front, 

 separated by a blackish, dull Hne, stretching to the scutellum ; the 

 yellow side line is interrupted above the wing-root, the postalar callus 

 yellow. The thorax is clothed with pale yellow hairs. Scutellum 

 yellow with the extreme basal corners black, it has pale yellow hairs. 

 Pleura æneous, shining, with the usual yellow spots, and with whitish 

 yellow hairs. Abdomen not at all longer than the wings; it is 

 distinctly clavate as it is narrowest about the third segment, the fifth 

 being the broadest; the third, fourth and fifth segments relatively 

 shorter than in the foregoing species; abdomen is black and shining, 

 with yellow markings, it is somewhat bluish towards the sides, only 

 dull on just the disc of second, third, fourth and fifth segments; at 

 the basal corners are small, yellow spots; on the second segment 

 there are a pair of oblique, yellow spots, stretching from about the 

 hinder corners up to the middle of the segment, well separated, or 

 connected to a somewhat emarginate band; the third segment has a 

 similar band, likewise beginning at the hinder corners and arched 

 forwards; it is quite entire or somewhat emarginate; the band on 

 fourth segment similar, generally slightly interrupted, and here pro- 

 duced a little forwards and backwards; the fifth segment has black 

 spots at the basal corners and a black middle line connected with 

 two black spots at the hind margin to a somewhat anchor-shaped 

 spot, the hind margin narrowly orange, and likewise the side margins; 

 the side margins of abdomen are otherwise not yellow, or very nar- 

 rowly so, but all the spots go over the margin. The hairs on abdomen 

 follow chiefly the ground colour, but are pale at the base and black 

 along the dorsum ; at the sides they are pale, and at the basal corners 

 long. Venter bluish black with yellow hind margins to the segments, 

 and with short, yellow hairs. Genitalia large, yellow or brownish 

 yellow ; sixth and seventh segments larger than in the foregoing species ; 

 eighth segment with two, more or less connected, black spots, one 

 above the other; ninth segment with two black spots at the base, 

 sometimes much extended but then indefinite; the appendages are 

 not long, they are haired but the hairs not long, nor forming tufts. 

 Legs with coxæ and trochanters more or less darkened, greyish yellow 

 to black ; femora with the basal part black, on hind femora the basal 

 half ; sometimes the femora still more black, anterior femora with the 

 basal half or more black and hind femora with only the apex yellow, 

 but the femora have the extreme base yellow; tibiæ yellow, sometimes 



