Syrphus. 299 



pruinosity stretching narrowly down the eye-margins. Episloma yel- 

 lovv or dark yellovv, yellowish pruinose at the sides, the lowermost 

 lateral parts blackish or with a blackish band across to the eye; jowls 

 blackish. Vertex and frons black-haired; epistoma yellow-haired, above 

 at the sides of the antennæ are black hairs. Occiput greyish white 

 pruinose; the hairs white below, yellow upwards; above a row of 

 black hairs overhanging the eyes. Eyes bare. Antennæ yellow or 

 reddish yellow, third joint oval; arista black, about as long as the 

 antennæ. Thorax dark æneous, sometiines somewhat bluish, shining, 

 a little yellowish above the wing root and on the postalar calli ; it is 

 clothed with yellow hairs, densest at the sides. Scutellum yellow, 

 a little æneous, with black hairs, at the base and basal corners some 

 yellow hairs and also often along the margin. Pleura with yellow 

 hairs, whitish downwards. Abdomen black, duU or slightly shining, 

 but shining at the apex; it has a pair of yellow basal spots and two 

 bands; the basal spots lie on the middle of the segment, they are 

 large, somewhat triangular, going in fuU width over the side margin 

 and stretching along it to the base; the band on third segment lies 

 near the front margin, it occupies the half of the segment; it is more 

 or less but generally slightly emarginate behind, a little sloping at the 

 sides and going widely over the margin; the band on fourth segment 

 similar but close to the front margin ; fourth segment with a broad 

 orange hind margin, fifth segment with all margins yellow and thus 

 only with a black, traiisverse middle spot. The hairs on abdomen 

 follow the ground colour but are black at apex in the middle; at the 

 sides they are yellow at the base and alternating black and yellow 

 down the sides according to the bands. Venter quite pale yellow and 

 translucent, clothed with long. pale hairs, only on the fourth segment 

 some black hairs. Genitalia not large, yellow, the end of the eighth 

 segment black, shining, the hairs black and yellow. Legs yellow, coxæ 

 and the very base of femora black, on hind femora sometimes in- 

 distinctly; hind tarsi generally a little brownish, especially towards 

 the apex. The long hairs behind the anterior femora yellow. on the 

 anterior side of hind femora mainly black, the short hairs on the 

 anterior side of hind femora and tibiæ black; for the rest yellow. 

 Wings yellowish to pale brownish tinged, especially at the anterior 

 margin. Squamulæ and fringes yellow. Balteres yellow. 



Female. Vertex of medium breadth, black; frons yellow above 

 the antennæ, for the rest black, with large, yellowish side dust spots 

 leaving a black middle line, widened below ; the hairs black. Jowls 

 greyish or more or less yellowish. Antennæ a little larger than 

 in the male, and the abdominal bands slightly narrower. Legs 



