280 Syrphidae. 



the fourth segment has at the front margin a narrow band, narrowly 

 divided in the middle, sometimes almost not divided; both bands go 

 widely over the side margin. Fourth and fifth segments have yellow 

 hind margins, the fifth also small basal corner spots. The hairs on 



Fig. 119. Antennæ of S. tricinctus d, from the inside x 60. 



abdomen follow mainly the ground colour, but they are pale on the 

 basal part of second segment; at the sides they are yellow at the base 

 and on the bands, for the rest black. Venter black with yellow bands 

 at the front margins on second and third segments; it is clothed with 

 long, yellowish hairs. Genitalia somewhat large, black, black-haired. 

 Legs orange, the basal half of anterior femora, and hind femora ex- 

 cept the apex black; anterior tarsi with the three middle joints more 

 or less darkened and hind tarsi with the three or four last joints 

 blackish. The hairs on femora yellow, more or less intermingled with 

 black hairs and on anterior femora sometimes nearly all black; the 

 short hairs on tibiæ yellow, those on the hind femora mainly black. 

 Wings a little yellowish tinged. Squamulæ yellow with a dark yellow 

 fringe. Halteres yellow or orange. 



Female. Frons broad, bluish black, shining, at each side a large, 

 greyish yellow pruinose spot; the hairs black. Abdomen shining, the 

 basal pair of spots small or wanting. 



LengLh 11 — 12 mm. 



The pupa is mentioned by Zetterstedt (1. c. 725) and described 

 as: "albida, supra fusco-marmorata, postice margine et dorso mucro- 

 nata", it seems thus to be similar to the pupa of albostriata; the 

 imago came on ^^/t. 



S. tricinctus is not properly common in Denmark; Copenhagen in 

 a garden, Ordrup Mose, Ermelund, Dyrehaven, Donse, Tyvekrogen, 

 Tisvilde, Nyrup Hegn; on Lolland in Vester Ulslev Mose; on Lange- 

 land at Lohals; in Jutland in Højenbæk Dal at Vejle, at Horsens, 

 Silkeborg, Rebbild near Skørping and Jerup near Frederikshavn. My 

 dates are ^^k — Vo. It occurs on various flowers on meadows and 

 in fens. 



I 



