Syrphus. 293 



— I have never seen any of the three species with interrupted 

 bands. 



All three species are common, but torvus less common than the 

 other two; they occur on alrnost all localities on leaves and flowers, 

 and generally in company; they are often seen in woods on some- 

 what sunny spots hovering in the air in great numbers and resting 

 on leaves or on the ground ; I have seen them, or at all events ribesii, 

 in this way as late as ^^/lo. They all may occur in gardens, but 

 vitripennis is by far the most common there. The times of the season^ 

 on which I have taken larvæ and pupæ seem to show that there are 

 more than one brood in the year, and I have taken newly emerged 

 specimens of vitripennis on ^/o; I am therefore inclined to think that 

 there are so many broods as the length of the warmer period and 

 the supply of food for the larvæ will allow, and then they hibernate 

 no doubt in every stage of the larva which the setting in of the cold 

 period prevents from growing further; perhaps also the pupa may 

 hibernate though this is less probable. 



10. S. annulatus Zett. 



1838. Zett. Ins. Lapp. 604, 25 et 1843. Dipt. Scand. II, 744, 47 et 1849. 

 VIII, 3144,47 (Scaeva). — 1901. Verr. Brit. FI. VIII, 358, 8. — 1907. Kat. 

 palåarkt. Dipt. III, 58. 



Male. Frons greyish yellow pruinose but shining black above the 

 antennæ; epistoma rather narrow, with somewhat parallel margins; it 

 is yellow with a broad, somewhat indefinite, black middle stripe, the 

 yellow side parts yellow pruinose; the mouth edge, the lower lateral 

 parts of epistoma and the jowls black. Vertex and frons black-haired, 

 epistoma with mainly dark hairs, paler below. Occiput yellowish grey 

 pruinose, with yellow hairs, above a few black hairs overhanging the 

 eyes. Eyes practically bare. Antennæ blackish, yellowish or yellowish 

 red beneath. Thorax greenish æneous, dullish, more shining towards 

 the sides; it is clothed with somewhat long, yellow hairs. Sculellum 

 yellow, with long, black hairs. Pleura with long, yellowish hairs. 

 Abdomen somewhat ovate, black, dull, a little shining at the sides 

 and at the hind margin of third segment, and more at the apex; it 

 has a pair of yellow basal spots and two bands, rather similar to 

 those in ribesii; the basal spots large, transverse, lying on the middle 

 of the segment, they slope forwards at the sides and go over the 

 margin; the band on third segment is a little from the front margin, 

 it is emarginate in the middle behind, sloping forwards at the sides 

 and going over the margin at the basal corners with about half its 

 breadth ; the third band is similar but a little nearer the front margin. 



