466 Syrphidae. 



the pruinose spots at the inner end on second and third segments 

 may be very small. Abdomen is yellow-haired, at the hind margins 

 or on the hind parts of the segments are black hairs; the hairs are 

 not short, especially rather long at the hind margin of fourth seg- 

 ment. Genitalia large, greyish or yellowish pruinose, yellow-haired. 

 Venter yellowish, darker and greyish at base and apex and generally 

 along the middle, with long, pale hairs; the terminal appendages of 

 the genitalia reddish, densely haired at the apex and front margin. 

 Legs about as in lunulatus and transfugus but anterior femora black 

 all round on the basal half though often a little pale at the base; the 

 apical third of front tibiæ black and generally a distinct ring before 

 the apex on middle tibiæ; the upper rings on tibiæ faint or nearly 

 wanting; hind legs quite as in the two preceding species, and likewise 

 very varying as to the extent of the black colour on femora, this 

 colour often present only as a black blotch above in the middle 

 stretching down on the sides ; hind femora simple but much thickened. 

 Legs quite or mainly pale-haired, there may be some black hairs 

 behind the anterior femora towards the apex, and the hind femora 

 are black setulose below in the apical half. Wings somewhat strongly 



Fig. 158. Wing of H. lineatus d". 



bro wnish™ tinged, sometimes less; cubital vein with a rather shallow 

 loop, and anal vein only slightly dipped down. Stigma consisting only 

 of the cross-vein and it is weak. Squamulæ whitish with a yellow 

 fringe. Halteres pale yellow. 



Female. Vertex and frons broader than in the male, and rather 

 broad, slightly widening downwards; vertex blackish, frons brownish 

 pruinose, the hairs black. The middle lines on thorax generally broader 

 than in the male, often widening inwardly behind and almost or quite 

 united. The flrst abdominal segment with a large, grey lunule widening 

 at the sides so that it leaves a black, semicircular spot at each side 

 at the hind margin; the abdominal spots on second and third seg- 

 ments with the side parts smaller than in the male but stretching 

 inwards as rather large, greyish or greyish yellow lunules, while the 



