430 Syi-phidae. 



when distui'bed making a rapid, sudden jerk but returning to about 

 the same spot. 



Geographical distribution: — Northern and middle Europe down 

 into northern Italy; towards the north to northern Sweden, and in 

 Finland. 



9. E. arbustorum L. 



1758. Linn. Syst. Nat. X, 591 et 1767. XII, 2, 984, 31 et 1761. Fn. 

 Suec. 1798 {Musca). — 1764. O. F. Miill. Fn. Fridrichsd. 715 (Musca). — 

 1775. Fabr. Syst. Entom. 765, 12 {Syrphus) et 1805. Syst. Antl. 236, 17. 

 — 1817. Fall. Dipt. Suec. Syrph. 25, 15 {Syrphus). — 1822. Meig. Syst. 

 Beschr. III, 395, 17. — 1842. Zett. Dipt. Scand. II, 659, 5 et 1855. XII, 

 4651,5 et 1859. XIII, 5080, 5 {Syrphus). — 1862. Schin. F. A. I, 335. — 

 1901. Verr. Brit. FL VIII, 510, 6, figs. 353—354. — 1907. Kat. palåarkt. 

 Dipt. III, 103. 



Male. Vertex blackish, a littie pruinose; frons yellowish pruinose, 

 epistoma grey pruinose all over without black middle stripe, only the 

 lower side parts are black; jowls black, partly grey pruinose. Vertex 

 with yellow, anteriorly black hairs, frons with yellow hairs and epi- 

 stoma all over with pale yellowish, rather dense and decumbent hairs ; 

 the epistoma rather flat, very slightly hoUowed below the antennæ, 

 the central knob very small and below it epistoma slightly retreating 

 and also slightly descending. Occiput whitish grey or silvery along 

 the eye-margin to above the middle, for the rest brownish yellow 

 pruinose, the hairs white below, yellow above and here a few black 

 hairs. Eyes with somewhat short, brown hairs. Antennæ somewhat 



Fig. 154. Antenna of E. arbustorum d", from the inside. X 60. 



small, brownish black, third joint with the upper front corner rounded; 

 arista brown, plumose on the basal half. Thorax blackish brown, a 

 littie shining on the posterior half, the front half more pruinose with 

 indications of a pair of paler stripes (or in reality with two approx- 

 imated, darker stripes in the middle and a roundish spot at each side, 



