255 Syrphidae, • 



yellow hairs. Abdomen velvet black, the extreme side margin, the 

 hind margin of third segment and the apex shining ; it has three pairs 

 of white or yellowish white, rarely more yellow spots; the first pair 

 transverse or a little lunulate, second and third pairs lunulate, beginning 

 at the middle of the side and stretching inwards and curving for- 

 wards; they are most narrow in the middle, the inner end widened 

 and rounded and going near to the front margin; the inner end thus 

 considerably nearer the front margin than the outer end, this latter 

 straightly cut, parallel with the side margin; all the hmules well 

 isolated; hind margins of fourth and fifth segments narrowly pale. 

 The hairs on abdomen are somewhat longish on the basal part and 

 long at the corners ; they are mainly yellow on the basal half and on 

 the spots, black on the hind part of the third and on the fom-th 

 segment, but partly pale on the fifth segment; the hairs at the side 

 margin all black, except at the base. Venter translucently yellow^ 

 with large, rectangular, transverse, black spots on the segments; the 

 spots vary somewhat in size, sometimes almost quite covering the 

 segments; the venter is clothed with long, whitish hairs. Legs yellow, 

 anterior femora with the basal half black, hind femora black except 

 the apex; tarsi black above, reddish below. Legs haired as usual, 

 the hairs on femora rather long, on anterior femora mixed black and 

 yellow, but most black, on hind femora yellow; the short hairs on 

 tibiæ yellow except partly on hind tibiæ; these latter slightly fringed 

 on the antero-dorsal side. Wings hyaline or nearly so. Squamulæ 

 and fringes yellowish white. Halteres yellow. 



Fig. 116. Wing of L. injrastri c?. 



Female. Frons somewhat broad ; vertex black, frons yellow, from 

 the vertex to the antennæ runs a downwards widening darker line, 

 it is sometimes eflfaced, the frons being upon the whole darker. Vertex 

 and frons black-haired. Epistoma yellow-haired or only with very 

 few black hairs. 



Length 10 — 14,.5 mm, specimens of the smaller size are only seen 

 more rarely. 



