334 Syrphidae. 



longest behind. Sculellum hrownish yellow, soniewhat æneous, with 

 long, black hairs or the hairs at the base more or less yellow. Pleura 

 with longish, pale yellow hairs. Abdomen nearly parallel-sided, as 

 broad as thorax; it is dull black, a little shining at base and apex, 

 with three pairs of whitish yellow spots (in the living specimens rather 

 whitish) ; the spots of the basal pair lie on the middle of the segment ; 

 they are not small, transversely subquadrate with the inner end 

 rounded, at the upper lateral corner they are a little produced and 

 near the margin, but not going over it; in the middle they leave 

 about the third of the segment black; the spots of second pair are 

 well away from the front margin, they are rectangular, a little nearer 

 to each other than the basal spots; the third pair of spots are quite 

 similar, a little nearer the front margin; both pairs are isolated from 

 the side margins ; fom-th and fifth segments have narrow, yellow hind 

 margins, the latter segment also more or less distinct spots at the 

 basal corners. The hairs on abdomen foUow partly the ground colour 

 but are mainly pale on second segment except at the hind margin 

 and on the front part of third segment; at the sides they are long 

 and yellow at the base down to the second pair of spots, from here 

 alternating black and yellow. Venter yellowish with more or less 

 distinct, dark bands near the hind margins of the segments which 

 bands are produced forwards at the lateral margins; the hairs are 

 long and pale. Genitalia of medium size, brown or blackish, some- 

 what pruinose behind but shining on the right side; the hairs are 

 black and yellow. Legs with the anterior femora black with the 

 apical half or third yellow, anterior tibiæ yellowish with a small, 

 blackish ring in the middle, tarsi brownish or blackish; hind legs 

 black with the knees narrowly reddish; hind metatarsi very slightly 

 thickened. The hairs on femora rather long, especially on hind femora; 

 they are yellow, on anterior femora with some few black towards 

 the apex; the short hairs are black on the apical part of hind femora 

 and on the basal part of hind tibiæ, for the rest mainly yellow; the 

 hind tibiæ have an antero-dorsal fringe, long about the middlo. 

 Wings slightly yellowish tinged. Squamulæ yellowish with a darker 

 yellow fringe. Halteres yellow. 



Female. Vertex somewhat broad, bluish black, shining; there are 

 large, grey frontal side dust spots, connected in the middle and going 

 broadly down along the eye-margins, leaving thus only a black lunule 

 above the antennæ generally connected by a very narrow stripe with 

 the vertex; the hairs all black. Epistoma quite white-haired. Thorax 

 more blue and a little more shining than in the male. Pleura whitish 

 grey pruinose and also the præsutural depression pruinose. Scuteilum 



