Sericomyia. 563 



Europe they occur in the mountains. They are rater shy and fly very 

 quickly and at long distances. 



Of the genus 4 or 5 species occur in the palæarctic region (two 

 or three in northern Europe, the other two in Russia and Siberia); 

 two occur in Denmark. 



Tahle of Species. 



1. Abdominal bands dark yellow, widened at the sides, apex of 



abdomen yellow; scutellum blackish; larger species 1. horealis. 



— Abdominal bands whitish or pale yellow (in fresh specimens), 

 not widened at the sides, apex of abdomen black ; scutellum 



reddish; smaller species 2. lappona. 



1. S. borealis Fall. 



1816. Fall. Dipt. Suec. Syrph. 20, 7 (Stjrphus). — 1822. Meig. Syst. 

 Beschr. III, 343, 2, Tab. XXXI, Fig. 9. — 1843. Zett. Dipt. Scand. II, 646, 3. 



— 1862. Schin. F. A. I, 331. — 1901. Verr. Brit. Fl. VIII, 635, 1, figs. 

 433—434. — 1907. Kat. palåarkt. Dipt. III, 140. 



Male. Vertex black, very sHghtly pruinose ; frons greyish pruinose, 



black and shining just above the antennæ, with an impressed middle 



line; epistoma yellow with a middle stripe and the lower side parts 



black, it is yellow pruinose at the sides above 



and downwards in front of the black parts; 



vertex black-haired, posteriorly with yellow 



hairs; frons yellow-haired, and epistoma with 



erect, yellow hairs on the sides above and 



downwards on the eye-margins. Occiput yel- 



lowish pruinose, above more greyish; the hairs 



yellowish and above some few black hairs. 



Antennæ reddish brown to blackish brown, the 



third joint generally darkest; arista brown, long 



plumose, with the rays blackish. Thorax black, 



a little æneous in front, slightly shining; there „. ,„,^ „ , ^ 



, ■ , A c • ^ • u u -u Fig.190. Head of 



are two approximated, famt greyish or brownish ^ borealis d". 



middle stripes, a little diverging behind and 



abbreviated at the middle; at the humeri and inwards is a white or 

 silvery pruinose spot; thorax is clothed with somewhat short hairs, 

 which are yellow or whitish on the front part and in front of scutel- 

 lum, but blackish across between the wing-roots; the hairs are shortest 

 on the middle; on the præalar and postalar calli are longer, tuft-hke, 

 more deeply yellow hairs. Scutellum black or slightly brownish black, 

 with black hairs on the disc, yellow on the base and round the 



3G* 



