Syrphus. 289 



alternating black and yellow, but the yellow tufts rather small in 

 accordance wilh the sloping bands. Venter translucently pale yellow, 

 with more or less pronounced blackish middle spots; it has long, pale 

 hairs. Genitalia somewhat small, yellow, but the eighth segment 

 mainly greyish black; the hairs black and yellow. Legs black and 

 yellow, anterior femora with about the basal third or more and hind 

 femora wilh about the basal two thirds black; hind tibiæ with a more 

 or less distinct, dark ring in the middle; tarsi blackish, middle meta- 

 tarsi more or less palé. The long hairs on femora yellow, on the 

 anterior femora wilh more or fewer black hairs intermingled and 

 black towards apex; the short hairs on hind femora to a great extent 

 black on the front side towards apex, and some of Ihe more bristly 

 hairs below the apex black, and likewise some on the middle femora 

 just at apex; the short hairs on tibiæ yellow, but black above 

 and parlly on the anterior side of hind tibiæ, and they form 

 here an antero-dorsal fringe. Wings hyaline or slightly yellowish tinged. 

 Squamulæ pale yellow with a yellow fringe and the thoracai 

 squamulæ besides the marginal fringe with long hairs above. Halteres 

 yellow. 



Female. Frons rapidly widening from the vertex downwards; 

 vertex black, frons yellowish pruinose but black and shining above 

 the antennæ, the hairs black. Eyes with much shorter hairs than in 

 the male, but, however, distinctly visible. There are no black hairs 

 above on occiput. Abdominal bands narrower than in the male, and 

 generally less emarginate. 



Length. The species varies somewhat in size, from 9,5 to 13 mm, 

 but the smallest sizes are only rarely found. 



S. torvus is common in Donmark; Copenhagen in gardens. Ler- 

 søen, Amager, Utterslev Mose, Ordrup Mose, Dyrehaven, Geel Skov, 

 Ruderhegn, Donse, Tyvekrog, Nordskoven at Jægerspris, Slagelse, Tis- 

 vilde, Nyraad near Vordingborg; on Lolland in Kældskov and at 

 Strandby; on Funen at Middelfart; in Jutland at Horsens, Rebbild 

 near Skørping and Jerup near Frederikshavn, and on Bornholm in 

 Almindingen. My dates are ^^/s — ^Vio. It occurs on various flowers 

 on fieids and in woods and for the rest on all localilies, generally in 

 greal numbers. 



Geographical distribution:— All Europa; towards the norlh to 

 northern Sweden, and in Finland; it also occurs in North America, 

 and it goes far towards the north as it occurs in Greenland up to 

 70° L. N. 



Remarks: As well known S.topiarim Meig. is now considered as 

 synonym to S. vitripennis Meig.; Ihe first author who sepaiated and 



19 



