450 Syrphidae. 



on Ihe middle. Pleura greyish pruinose with yellow hairs. Abdomen 

 elongated, somewhat conical, black with extended bright yellow mar- 

 kings; it is dull, the hind margins of second and third segments 

 shining, the fourth segment almost quite shining, only a little dull 

 near the base; the second segment with large side spots occupying 

 the whole side margin, narrowing somewhat inwards, leaving only a 

 triangular front part, a middle stripe and the hind margin black, the 

 latter reaching to or very near to the side margins; third segment with 

 similar large spots lying towards Ihe front margin and leaving a 

 broader hind margin black; their inner lower corner is protruding 

 inwards and a little upwards as grey, somewhat pruinose spots and 

 nearly meeting in the middle; the fourth segment has small, yellow 

 spots just at the basal side margin, the side is grey, sending from the 

 middle a narrow band inwards and forwards, the band from each side 

 nearly or quite meeting in the middle and thus forming a grey, somewhat 

 pruinose bow. The pubescence is short, longest towards the base of the 

 segments; it mainly foUows the ground colour but is pale on the front 

 part of the segments, on second segment to near the hind margin ; at 

 the side margins it is yellow but more or less black on the hind part 

 of second and third segments. Genitalia a little pruinose, with pale 

 hairs. Venter pale yellow with a spot on first segment, fourth segment 

 and the genitalia greyish black ; it has long, pale hairs. Legs with 

 the femora black, the anterior with about the apical third yellow, 

 hind femora only slightly brownish at the apex below or on a ring 

 just before the apex; anterior tibiæ and tarsi yellow, the fi'ont tarsi 

 darkened on the anterior side of the two basal joints; hind tibiæ 

 black with the basal third yellow, hind tarsi black, rather broad and 

 flat; hind femora thickened about the middle; hind tibiæ a little curved 

 towards the apex. Anterior femora with somewhat long hairs on 

 the posterior side, hind femora on the antero-dorsal side and with 

 some scattered hairs below, for the rest the legs short-haired; the 

 hairs nearly all yellow, only partly black on the posterior side of hind 

 femora, and there are a few black, bristly hairs below the middle 

 femora on the apical half; hind femora black spinulose below in the 

 apical two thirds and with some longer bristles below the apex. 

 Wings hyaline or a little yellowish at the anterior margin from the 

 base to the yellow stigma. Squamulæ with their fringes and the 

 balteres yellow. 



Female. Vertex broader than in the male, slightly and evenly 

 widening downwards; frons a little darker in the middle, for the rest 

 the head coloured and haired as in the male. Abdomen broader 

 than in the male and more suddenly pointed, the spots narrower, 



