Syrphus. 303 



stripes; it is a liltle yellowish above the wing-root and on the postalar 

 calli; it is clothed witli yellow hairs, densest at the sides. Scu- 

 tellum yellow or a liltle darkened, with yellow hairs, sometimes with 

 some fevv black intermingied; in rare cases the black hairs more 

 numerous, predominant on the disc. Pleura with long, yellow hairs. 

 Abdomen marginate, dull black, a little shining at the hind margins 

 of the segments and more at the apex, with a pair of yellow basal 

 spots and two broad bands; the basal spots lie somewhat near the 

 hind margin, they are large, triangular, at the sides sloping upwards 

 towards the basal corners; the band on third segment lies near the 

 front margin, its fore margin is a little undulate, behind it is more 

 or less deeply emarginate in the middle, and at the sides it bends 

 somewhat angularly upwards so that it is here about parallel with 

 the side margin; it is broad, occupying more than two thirds of the 

 segment; the band on fourth segment is similar but quite near to the 

 front margin; the basal spots generally go over the side at the basal 

 corners, the bands are generally isolated but may reach the sides 

 above more or less indistinctly; the emarginations in the middle of 

 the front and hind margins may vary in depth, and they may go 

 quite through so the band is scparated into spots, either both bands 

 or only the one on third segment. The fourth segment has a yellow 

 hind margin, the fifth is yellow with a black middle spot, The hairs 

 on abdomen folio w the ground colour bul are black at apex; at the 

 sides they are long and yellow just at the base, for the rest short 

 and black. Venter yellow with large, black, transverse spots on the 

 segments ; it has long, yellow hairs, shorter and black behind. Geni- 

 talia small, sixth and seventh segments yellow, eighth mostly black, 

 ninth yellowish or somewhat blackish ; the hairs black and yellow. 

 Legs yellow with the basal third of anterior femora and the basal 

 half or two thirds of hind femora black ; anterior tarsi with the three 

 middle joints brownish, hind tarsi blackish, metatarsus yellowish or 

 brownish. The hairs behind anterior femora mainly black but pale 

 at the base, on the anterior side of hind femora yellow; the short 

 hairs are yellow except on the anterior side of hind femora, and they 

 are black on hind tibiæ except below. Wings a liltle or somewhat 

 yellowish tinged. Squaraulæ yellow with darker yellow margin and 

 fringe. Halleres pale yellow. 



Female. Verlex somewhat broad, black and shining; the frons 

 hkewise to below the middle, the rest yellow; the border of the black 

 part a little incised in the middle; there are no dust spots; the hairs 

 black; the hinder eye-margin broad above. Thorax more shining than 

 in the male. Abdominal bands narrower and generally going distinctly 



