294 Syrphidåe. 



less emarginate and less sloping at the sides, going more widely over 

 the margin: the fourth segment has a yellow hind margin, the fifth 

 h'kewise but narrow, and also with the sides or basal corners yellow. 

 The hairs on abdomen follow the ground colour; at the sides they 

 are yellow at the base, for the rest alternating black and yellow 

 according to the bands. Venter coloured mainly as dorsuni but the 

 pale parts translucent and whitish, and the markings somewhat in- 

 defmite; sometimes the venter is almost quite pale or on the contrary 

 rather darkened; it is clothed with longish, pale hairs. Genilalia some- 

 what large, shining black, black-haired. Legs mainly yellow, anterior 

 femora with about the basal third black, tibiæ and tarsi all yellow; 

 hind legs black with the knees yellowish. The long hairs on anterior 

 femora yellow on the basal part, black on the apical part, on hind 

 femora all or mainly yellow; the short hairs on the anterior legs yel- 

 low with some black intermingled, on the hind legs mainly black; 

 front tarsi with black spinules along the posterior side and middle 

 tarsi black-spinulose beneath. Wings hyaline to somewhat brownish 

 tinged; stigma pale. Squamulæ and fringes pale yellowish. Halteres 

 yellow or pale yellow. 



Fernale. Veilex moderately broad, frons widening downwards. 

 Vertex black, shining; frons with large, yellowish side dust spots, con- 

 nected at the sides with epistoma, thus there is above the antennæ a 

 shining black lunule, connected by a middle stripe with the vertex; 

 all hairs black. Abdominal bands slightly narrower than in the male, 

 fourth and fifth segments with broader yellow hind margins. Anterior 

 legs quite yellow; hind femora yellow at base and apex and thus 

 with a more or less broad, dark ring near the apex. hind tibiæ. ex- 

 cept base, and hind tarsi blackish or brownish. 



Length 7 — 8,5 mm. 



S. annnlatus is rare in Denmark; Dyrehaven. Lyngby Mose, Geel 

 Skov, Hillerød, Tyvekrog; on Lolland in Dødemose and at Kærstrup. 

 and in Jutland at Silkeborg. My dates are ^^/5 — i"/?; it seems to be 

 most common in spring. It occurs on fieids and in woods; I have 

 taken it on Gratægus. 



Geographical distribution: — With certainty the species is only 

 known from northern Europe with Britain, but probably it goes farther 

 towards the south; towards the norlh it occurs to northern Sweden, 

 and in Finland, but it is upon the whole not common. 



Remarks: I think no error is possible with regard to the deter- 

 mination of this species, and Zetterstedt mentions also (1. c. VIII) 

 specimens from Denmark, but I must note that my specimens have 

 thorax about as dull as in lineola. only somewhat shining at the 



