116 Syrphidae. 



by the more produced mouth edge, the distincl division between the 

 eye-facets, the more thinly haired thorax and abdomen and shorter 

 haired venter, and in the female by the broader frons, the thinly and 

 very short-haired and more dark-haired thorax and abdomen; in both 

 sexes the wings are generally more strongly clouded and fmally the 

 size is smaller. 



O.cidiiata is common in Denmark; Vester Fælled, Ordrup Mose, 

 Lyngby Mose, Ørholm, Geel Skov, Hillerød, Frederikssund, Boserup at 

 Roskilde; on Lolland at Strandby, in Egholm Skov and in Døderaose 

 w^est of Nysted; on Funen at Odense and in Jutland at Silkeborg. 

 My dates are ^^/a — ^^/e. It occurs in fens and on meadows often at 

 horders of ditches, on various flowers thus often on Ranunculus. 



Geographical distribution: — Europe down into Italy; towards 

 the north to southern Sweden, and in Finland. 



3. C. solstitialis Fall. 



1817. Fall. Dipt. Suec. Syrph. 56, 14 (Eristalis). — 1843. Zett. Dipt. 

 Scand. II, 817, 1 et 1849. VIII, 3177, 1 et 1855. XII, 4669, 1 et 1859. 

 XIII, 6022, 1. — 1901. Verr. Brit. FL VIII, 203, 6. - 1907. Kat. palåarkt. 

 Dipt. III, 19. — Musca coemeteriorum 1775. Fabr. Syst. Entom. 779, 28 et 

 1781. Spec. Ins. 11, 443, 39 et 1787. Mant. Ins. II, 339 (Syrphus) et 1794. 

 Ent. Syst. IV, 303, 94 (Syrphus) et 1805. Syst. Antl. 246, 65 (Eristalis). 

 — 1801. Panz. En. Germ. LXXXII, 17 (Syrphus). — Chr. coemeteriorum 

 1822. Meig. Syst. Beschr. III, 268, 5, Tab. XXX, Fig. 17. — 1843. Loew, 

 Stett. ent. Zeitg. IV, 246. — 1862. Schin. F. A. I, 270. 



Male. Vertex dull, frons and epistoma æneous black, shining; 

 frons considerably puffed out, with an obvious longitudinal furrow^; 

 epistoma with a greyish band below the antennæ and with the central 

 knob and likewise the mouth edge only slightly produced; frons and 

 epistoma not broad, the latter with parallel horders. Vertex and frons 

 with longish, black hairs, epistoma almost bare only with some few, 

 pale hairs. Occiput black, greyish dusted at the eye-margin, with short 

 hairs which are blackish above, pale below. Antennæ small, brownish 

 red or reddish, third joint generally palest beneath at the base ; second 

 joint with somewhat long, dark bristles beneath; arista much longer 

 than the antennæ. Thorax dull velvet black on the disc, the sides 

 and scutellum æneous and somewhat shining, punctate; it is clothed 

 with longish, more or less depressed, and with short, black hairs, 

 the hind part of the disc and scutellum with short, bristly hairs, longer 

 at the margin of scutellum; this latter is depressed in the middle. 

 Pleura æneous, shining, with black hairs. Abdomen dull velvet black 

 or brownish black, the apex and the extreme sides æneous and shining; 



