248 Syrphidae. 



1. I. glaiicius L. 



1758. Linn. Syst. Nat. X, 593 et 1761. Fn. Suec. 1813 et 1767. Syst. 

 Nat. XII, 2, 986, 47 (Musca). — 1843. Zett. Dipt. Scand. II, 275, 28 (Scaeva). 



— 1862. Schin. F. A. I, 302 (Syrphm). — 1901. Verr. Brit. Fl. VIII, 322, 1. 



— 1907. Kat. palåarkt. Dipt. III, 53. — Sijrphus nobilis Meig. 1822. Syst. 

 Beschr. III, 316,62. 



Male. Frons and epistoma yellovv and yellow pruinose; above 

 the antennæ the frons brownish or blackish; the central knob undusted 

 in its whole length, somewhat shining; jowls more or less darkened, 

 almost bluish but the hind part yellow. Vertex black-haired, only 

 just behind with yellow hairs; frons "with brown or blackish hairs, 

 epistoma yellow-haired. Occiput grey pruinose, with yellow hairs, 

 above sometimes some few black hairs. Eyes densely hairy with 

 brown, downwards paler hairs. Antennæ black. Thorax greenish or 

 brassy, dull, with indications of three darker lines; the præsutural 

 depression more or less yellowish. Scutellum yellow, translucent. 

 Thorax and scutellum clothed with long, erect, yellow hairs, longest 

 behind and on scutellum. Pleura with yellow or pale yellow hairs. 

 Abdomen velvet black, bluish and shining at the tip; first segment 

 greyish or greenish; second segment with two large, isolated and ap- 

 proximated spots lying on the front part of the segment, close to the 

 front margin; the spots are subquadrate with the inner hinder corner 

 rounded; they vary in colour from bluish to bony white; the third 

 and fourth segments each with a pair of narrow, transverse, bluish or 

 bluish grey spots near to the front margins and going more or less 

 distinctly over the side margins. Abdomen is clothed with longish 

 hairs, longest at the basal corners, they follow in colour chiefly the 

 ground colour, and hence there are black tufts at the hind corners of 

 second, third and fourth segments. Venter coloured about as dorsum, 

 but often the whole second segment pale and the spots united to 

 bands lying close to the front margins and rather shining; it is clothed 

 with long hairs, pale on the basal half, dark behind. Legs yellow 

 with about the basal half of anterior femora and hind femora except 

 the apex black; hind tibiæ with a more or less distinct, brownish or 

 blackish ring in the middle. Legs haired as usual, the hairs all pale 

 except on the front side of the black parts of hind or posterior femora 

 and generally some few at the base of the, front femora. Wings more 

 or less yellowish tinged, most at the front margin. Squamulæ yel- 

 lowish with a yellow fringe. Balteres yellow. Plumula whitish or 

 pale yellow. 



Female. Eyes separated but the frons not broad, widening some- 

 what rapidly downwards; it is yellow pruinose with a black middle 



