250 Syrphidae. 



Abdomen is clothed with rather long hairs, mainly following the ground! 

 colour. Venter generally with the base pale or sometimes darker, third 

 segment black and the fourth grey, or third and fourth black with 

 bluish front bands; the venter has long, pale hairs. Legs black, anterior 

 femora with the apical part and anterior tibiæ with the basal part 

 yellow, hind tibiæ with the very base a little pale; legs haired as 

 usual, the long hairs on femora pale, except on the apical part of 

 front femora; the short hairs on the front side of posterior femora 

 partly black; anterior tibiæ mainly yellow-haired, hind tibiæ black- 

 haired. Wings more or less, sometimes somewhat strongly yellowish 

 or brownish tinged. Squamulæ brown or blackish brown, with a 

 brownish yellow fringe. Halteres dark yellow. Plumula whitish. 



Female. Ocellar triangle large and prominent. Frons not speci- 

 ally broad, widening downwards ; it is greyish pruinose with a broad, 

 blackish middle stripe, and all black-haired. Epistoma yellow-haired. 

 Pleura with white hairs. Scutellum with the apex generally more 

 pale than in the male. Abdomen with the basal spots generally bony 

 white, and with indications of spots at the basal corners of fifth seg- 

 ment. Legs mainly pale-haired except above hind tibiæ, 



Length 9 — 11 mm. 



Remarks: S.glaucius Fabr. is commonly considered a synonym 

 to the present species, and this may be so, I shall, however, not omit 

 to mention that in the collection of Tonder Lund and Sehestedt, the 

 determination of which is to a great degree due to Fabricius, a speci- 

 men stands, labelled glaucius. and this specimen is glauciiis L. 



/. laternarius is not rare in Denmark, though it cannot be termed 

 common; Ordrup Mose, Gurre Vang; on Lolland in Dødemose west 

 of Nysted; on Funen at Veflinge and Middelfart; in Jutland in Nør- 

 holm Skov at Varde, Vejle Nørreskov, Greisdal and Højenbæk Dal 

 at Vejle, at Horsens, Laven and Funder near Silkeborg and in Hø 

 Skov at Aarhus. My dates are Vt — ^^/s. It occurs on meadows, often on 

 meadows in woods on Umbelliferæ, I have generally taken it on Heracleum. 



Geographical distribution: — Northern and middle Europe down 

 into France; it was not known north of Denmark until 1907, when it 

 was taken in Scania (Ringdahl, Entom. Tidskr. XXXII, 1911, 124); 

 according to Verrall it probably also occurs in North America in 

 California and Oregon, as tricolor Big. and velutinus Willist. are pro- 

 bable synonyms. 



17. Didea Macq. 



Like the allied genera rather near to Si/rp/ms. The species are of 

 medium or somewhat large size, with extended greenish or orange 



