1 14 Syrphidae. 



postero-ventral side of the anterior feniora and to a less degree on 

 the hind femora; on the front femora they are partly or quite dark; 

 front and hind tibiæ and tarsi with short, adpressed reddish pubescence 

 below; hind femora setulose below; hind metatarsus very slightly 

 thickened. Wings a little tinged; stigma brownish, below it generally 

 a large indefinite browning, sometimes almost wanting. Plumula 

 blackish. Squamulæ brownish or blackish brown with a yellowish 

 fringe. Balteres blackish brown, the peduncle paler. 



Female. Frons broad with a slight or very slight depressed middle 

 channel, and more or less distinct, irregular and sometimes almost 

 wanting cross-furrows ; epistoma without central knob; frons and 

 occiput pale-haired, Antennæ a httle larger than in the male. Thorax 

 with short, dense, yellow hairs. Abdomen æneous black, indefmitely 

 dullish on the disc, with short, yellow hairs. Femora shorter-haired 

 than in the male. Squamulæ a little paler. 



Length 6,5 — 7,2 mm. 



C. Macquarti is not rare in Denmark; Ordrup Mose, Ermelund, 

 Bøllemosen, Dyrehaven, Lyngby Mose, Bagsvær, Ørholm, Ruderhegn, 

 Birkerød, Hillerød; on Lolland at Nysted, Strandby, Kældskov and 

 Dødemose west of Nysted; on Funen at Odense; in Jutland in Nør- 

 holm Skov at Varde, at Horsens, Nebsager near Horsens, Silkeborg, 

 Holstebro, Hald near Viborg, Rebbild near Skørping and Frederiks- 

 havn, and on Bornholm in Almindingen. My dates are ^'^/s to the 

 first part of August. It occurs on flowers in fens and on humid 

 marshes. The pupa was found in flood refuse at Silkeborg on ^"^/s, 

 it developed soon after (Esben Petersen). 



Geographical distribution: — Europe down into Italy; towards the 

 north to middle Sweden, and in Finland. 



2. C. viduata L. 



1758. Linn. Syst. Nat. X, 598 et 1767. XII, 2, 994, 94 et 1761. Fn. 

 Suec. 1852 (Musca). — 1817. Fall. Dipt. Suec. Syrph. 56, 15 (Eristalis). 

 — 1822. Meig. Syst. Beschr. III, 269, 6. — 1843. Loew, Stett. ent. Zeitg. 

 IV, 248. — 1862. Schin. F. A. I, 268. — 1907. Kat. palåarkt. Dipt. III, 20. - 

 Chr. nuda Macq. 1827. Soc. Se. Lille, 195,9 et 1834. Suit. å Bufl. I, 562, 

 10. — 1838. Meig. 1. c. VII, 122, 20. — 1843. Zett. Dipt. Scand. II, 820, 

 4 et 1855. XII, 4670, 4. 



Male. Vertex, frons and epistoma black; frons much arched and 

 puffed out, with a longitudinal or more dot-like impression; epistoma 

 with a rather small central knob, the mouth edge a little more pro- 

 truding than the knob; below the antennæ the epistoma is somewhat 

 greyish dusted, the dust forming a transverse spot, pointed towards 



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