106 Syrphidae. 



fuiTOws. Frons and epistoma a little rnore conspicuously haired than 

 in the male, Antennæ with the third joint soraewhat larger, generally 

 pale at the base below. Thorax a little more conspicuously hairy 

 than in the male, the stripes more conspicuous. Abdomen æneous 

 or coppery at the sides and less duU on the disc, rather densely punc- 



Fig. 45. Wing of O. hrevicornis Q. 



tate and densely hairy ; fourth segment without wart. Hind femora 

 not setulose beneath. Wings more evenly and less tinged or almost 

 hyaline. 



Length 5,6 to about 7 mm. 



O. brevicornis is rare in Denmark, only four specimens, all females 

 have been taken; Ordrup Mose, Ermelund, Lyngby Mose and at Fure 

 Sø (the author) ; the dates are ^^/o — ^^'e ; the first specimen was taken 

 in 1906. It occurs on flowers in fens and on humid piaces. 



Geographical distribution: — Europe down into Italy; it is not 

 known north of Denmark, but occurs i England. 



5. O. nobilis Fall. 



1817. Fall. Dipt. Suec. Syrph. 57, 17 {Eristalis). — 1822. Meig. Syst. 

 Beschr. 111, 272, 13, Tab. XXX, Fig. 18. — 1843. Zett. Dipt. Scand. [I, 

 823, 7. — 1843. Loew, Stett. ent. Zeitg. IV, 262, Tab. 111, Fig. 16—18. — 

 1862. Schin. F. A. 1, 272. — 1901. Verr. Brit. FJ. VIII, 190, 3, figs. 201- 

 202. — 1907. Kat. palåarkt. Dipt. III, 16. — Chrysogaster nigrkollis Meig. 

 1822. Syst. Beschr. III, 271, 12. 



Male. Head broader than high. Vertex, frons and epistoma metallic 

 green, or the latter more bluish ; frons with a small dot-like impres- 

 sion above the antennæ; ey e-suture quite short. Frons and epistoma 

 somewhat narrow above, rather rapidly widening downwards; the 

 epistoma is a little arched and the mouth edge somewhat produced; 

 below the antennæ there is a grey dust spot on each side, stretching 

 as a line down on the jowls along the eye-margin. Vertex and upper 

 part of frons with brown hairs, the lower part of the frons and epistoma 



I 



