210 



Syrphidae. 



posterior side with longish, yellow or towards the apex blackish hairs; 

 middle tibiæ curiously shaped, flat or slightly canaliculated below, 

 dilated in the middle and here bent a little forwards and the apex 

 again bent a httle backwards and inwards and some- 

 what twisted; they are haired with short, yellow hairs, 

 but the ventral margins have generally blackish hairs 

 in the basal half, longest on the posterior side; hind 

 legs mainly with short, pale hairs, only longer below 

 the femora, and sonie few, generally dark hairs about 

 the middle on the antero-dorsal side of the tibiæ; the 

 tibiæ are a little undulated; hind metatarsi somewhat 

 thickened. Wings slightly to rather strongly brownish 

 tinged. Squamulæ brownish white to brownish with a 

 yellow fringe, Halteres yellow. 



Female. Frons broad, æneous, with two triangular. 

 yellow side dust spots, connected at the eye-margin 

 with the pruinosity on epistoma; it is yellow-haired, 

 only just in front of the ocelli are darker hairs. Epi- 

 stoma with somewhat short, whitish hairs. Thorax short- 

 haired, Abdominal spots about as in the male, the 

 pair on fifth segment large and distinct, and the sixth 

 segment quite or partly yellow. Legs much paler than 

 in the male, hind femora and tibiæ with only small 

 and often faint, blackish rings, and metatarsus and the 

 two apical joints also often slightly darkened ; the middle 

 tibiæ show very slight traces of the same shape as in 

 the male. The hairs behind the anterior femora rather short and 

 front femora as in the male with no white hair at the base. Squamulæ 

 yellow. 



Length 8 — 9 mm. 



F. scambus is not common in Denmark; Copenhagen in a garden. 

 Amager, Lersø, Damhusmosen, Dyrehaven, Lyngby Mose, Søllerød, 

 Bagsvær, Hillerød, Donse, Jægerspris and at Roskilde; in Jutland at 

 Sminge near Silkeborg. My dates are -^^/s — ^°/s, It occurs in fens and 

 meadows, and I have especially taken it flying in high grass. 



Geographical distribution:— Northern and middle Europe down 

 into Bohemia and Styria; towards the north to northern Sweden, and 

 in Finland; as it has hitherto generally not been correctly recognised 

 it will probably prove to be as widely distributed as the other species: 

 according to Verrall P. chaetopodns Will. is a synonym, and the species 

 should thus occur also in North America. 



Fig. 104. 



P. scambus q. 



right front leg 



from below. 



X 20. 





