175 Syrphidae. 



black, and often a broad longitudinal middle band black-haired. Ab- 

 domen densely and coarsely punctate and not nmch shining, with 

 short, depressed, whitish hairs, only erect at the basal corners of ab- 

 donien. Legs short-haired, hind femora with very short, bristly, pale 

 hairs below, black and a little stronger on the apical part. 



Length G to fully 8 mm. 



61 impressa is somewhat common in Denmark; at Copenhagen, 

 Lersø, Amager, Ordrup Mose, Dyrehaven, Hillerød, Tyvekrog, Faxe 

 Ladeplads, Jægerspris; on Lolland in Kældskov, Egholm Skov, Døde- 

 mose, Kærstrup and Strandby; on Langeland atLohals; on Funen at 

 Odense. My dates are ^Vc— Vn, it thus occurs somewhat late. It occm-s 

 in grass and on flowers in fens and on fields. 



Geographical distribution: — All Europe, towards the north to 

 middle Sweden, and in Finland. 



24. C. albitarsis Meig. 



1822. Meig. Syst. Beschr. III, 290, 22 (Syrphvs). - 1838. Zett. Ins. 

 Lapp. 612, 8 et 1849. Dipt. Scand. VIII, 3170, 18—19 et 1855. XII, 4666, 

 18—19 (Erisialis). — 1862. Schin. F. A. I, 283. — 1901. Verr. Brit. Fl. 

 VIII, 245, 19, fig. 213. — 1902. Beck. Zeitschr. Hymn. Dipt. II, 352, 22. — 

 1907. Kat. palåarkt. Dipt. III, 22. — Musca viduata Fabr. (nec L. teste 

 Meig.) 1775. Syst. Entom. 781, 41 et 1781. Spec. Ins. II, 446, 54 et 1787. 

 Mant. Ins. 348 et 1794. Ent. Syst. IV, 336, 10. — C. viduata 1862. Schin. 

 F. A. I, 288. — 1894. Beck. Nov. Aet. Leop. Carol. Akad. LXII, 235 et 439, 

 86, Fig. 91. — Eristalis coemeterioriini var. y, 1817. Fall. Dipt. Suec. 

 Syrph. 55. — Sijrphus viduus Meig. 1822. 1. c. III, 282, 9 et 1838 (Cheilosia) 

 VII, 124. — 1902. Beck. Zeitschr. Hymn. Dipt. II, 351, 9. — C. flavimana 

 Meig. 1838. 1. c. VII, 126, 25. — Eristalis ftavimana 1843. Zett. 1. c. II, 

 793, 18 et 1849. VIII, 3169, 18. — C. ftavimana 1902. Beck. Zeitschr. 

 Hymn. Dipt. II, 355, 25. — Eristalis innupta Zett. 1843. 1. c. II, 802, 26 

 et 1849. VIII, 3172, 26 et 1859. XIII, 6018, 26. — 1894. Beck. Nov. Aet. 

 Leop. Carol. Akad. LXII, 249. 



Male. Eyes with somewhat short, brownish hairs. Frons shining, 

 with a somewhat broad and triangular longitudinal groove; vertex 

 and frons black-haired. Epistoma somewhat greyish pruinose all over 

 and only slightly more below the antennæ; it is much hollowed below 

 the antennæ, the central knob rather large and prominent; between 

 the knob and the mouth edge the epistoma somewhat hollowed, the 

 lower part somewhat protruding and also somewhat descending. Eye- 

 margins somewhat narrow, a little pruinose, with short, white hairs. 

 Occiput greyish pruinose, narrowly grey towards the margin of the 

 eye, the colour stopping below the margin of the eye; the hairs 

 whitish below, chiefly black above, and here there are long hairs. 

 Antennæ small, black or second and third joints blackish brown, 



