Syritta. 529 



but only two of them are European, and except the common pipiens 

 they are all southern species; only pipiens occurs in Denmark. 



1. S. pipiens L. 



1758. Linn. Syst. Nat. X, 594 et 1767. XII, 2, 988, 56 et 1761. Fn. 

 Suec. 1882 (Musca). — 1764. O. F. Muli. Fn. Fridrichsd. 725 (Miisca). — 

 1775. Fabr. Syst. Entom. 772, 46 {Syrphus) et 1805. Syst. Antl. 194, 27 

 (Milesia). — 1816. Fall. Dipt. Suec. Syrph. 12, 9 {Milesia). — 1822. Meig. 

 Syst. Beschr. III, 213, 1 (Xylota) et 1838. VII, 114, 1, Tab. LXVII, Fig. 21— 

 29. — 1843. Zett. Dipt. Scand. II, 881, 1 et 1855. XII, 4675, 1. — 1862. 

 Schin. F. A. I, 358. — 1901. Verr. Brit. Fl. VIII, 612, 1, figs. 416—417. — 

 1907. Kat. palaarkt. Dipt. III, 132. 



Male. Vertex very elongated triangular, black behind, yellow 

 pruinose on the front half; frons pale yellow and epistoma white 

 pruinose, the extreme mouth edge bare and likewise the lower side 

 parts which are yellow, blaekish anteriorly; vertex with short, yellow 

 hairs; frons bare, epistoma with a few white hairs on the sides below. 

 Occiput whitish grey pruinose, æneous above but with a small pruinose 

 spot at each side of the vertex; the hairs very short, white below, 

 yellowish and a little longer above ; on the middle they are exceedingly 

 short. Antennæ yellowish red ; arista short, not longer than the antennæ, 

 brown. Thorax black or æneous black, very slightly shining; humeri 

 and the side margins to the transverse furrow broadly yellow pruinose ; 

 in the middle of the front margin two grey pruinose spots as beginning 

 of lines; postalar calli reddish, in front of them a yellowish pruinose 

 streak, the inner ends of which form two pale spots at the hind margin 

 in front of scutellum, one on each side. Thorax is clothed with quite 

 short and adpressed, yellow hairs. Scutellum coloured and haired as 

 thorax. Pleura pale yellow to whitish grey pruinose, with very short, 

 pale hairs. Abdomen dull black, the middle of the extreme hind 

 margin of the third segment and the whole fourth segment shining; 

 first segment grey at the basal corners, second segment with a pair 

 of large, yellow side spots at the front margin, they occupy two thirds 

 of the length at the side margin but are sloping inwards at both ends 

 so that their inner margin is much shorter than the side margin and 

 often rounded ; on the third segment are a pair of similar spots, but 

 they are shorter, more quadrate and close to the fi'ont margin, they 

 are sometimes connected in the middle at the front margin; the fourth 

 segment has as a pair of transverse, greyish yellow pruinose spots at 

 the basal corners; the spots go all in full width over the side margin; 

 the yellow spots are more or less shining, in certain lights they are 

 somewhat whitish pruinose; the hind margin of fourth segment is 



34 



