Chrysotoxum. 575 



the first segment for the greater part reddish; the third and fourth 

 segments have each a pair of transverse, yellow spots close to the 

 front margin ; the hairs on venter are long and pale on the basal half, 

 short and black behind. Legs yellow with coxæ and trochanters black, 

 femora more reddish yellow; tibiæ quite, or except the apex, pale or 

 canary yellow ; the legs somewhat short-haired and not densely haired ; 

 the hairs all yellow. Wings rather brownish yellow tinged, strongly 



Fig. 196. Wing of C. festivum d. 



towards the anterior margin; before the end of the subcostal vein is 

 a brown, roundish spot at the anterior margin; it is sometimes some- 

 what faint; the cubital vein has a rather deep curve. Squamulæ and 

 fringes yellow or orange. Halteres yellow. 



Female. Similar; vertex and frons broad, widening downwards, 

 black; frons with two large, yellowish dust spots; the hairs very short, 

 black. Eyes very short-hairy, nearly bare. Thorax and scutellum 

 exceedingly short-haired, the hairs behind on thorax black. Abdomen 

 with the pale hind margins to the segments narrower than in the 

 male and generally present only on fourth and fifth segments. 



Length 11—14,5 mm. 



C. festivum is common in Denmark; Fuglsang Sø, Lyngby Mose, 

 Fiskebæk, Geel Skov, Hillerød, Tisvilde, Melby, Rørvig, Nordskoven at 

 Jægerspris; on Lolland at Maribo, in Kældskov and Vester Ulslev 

 Mose ; on Funen at Odense ; in Jutland in Nørholm Skov at Varde, at 

 Horsens, Frijsenborg, Funder near Silkeborg, Hald near Viborg, Sønder- 

 vig, Blaavandshuk, Restrup at Aalborg, Sæby, Frederikshavn and on 

 Læsø. My dates are ^'^k — ^/o. It occurs in woods, fens and on meadows, 

 sometimes at the horders of water, and it is seen on many various 

 flowers. Two of the specimens in our coUection are bred, but there 

 are no notes about the circumstances under which the larvæ or pupæ 

 were found. 



Geographical distribution : — Europe down into Italy, and in 

 North Africa; towards the north to middle Sweden, in Finland and 

 Siberia. 



