352 Syrphidae. 



the yellow niarkiiigs more extended than in nitidicollis) seems to be 

 the most common; perhaps it is a more southern variety. 



Length 6— 6,5 mm. 



The pupa resembles the one of the two preceding species. 



This species is easily known from the two foregoing species by 

 the shiniiig thorax with the yellow marginal line interrupted, and the 

 clavate abdomen, and in the male by the genital appendages with- 

 out hair tufts. 



S. flavicauda is rare in Denmark; Vesterfælled (Schlick), Char- 

 lottenlund, Vedbæk (Stæger), Hillerød (Godskesen), and in Jutland at 

 Aalborg in a garden (the author) and at Frederikshavn (H. J. Hansen). 

 The dates are in July. Verrall states that there is some connection 

 between this species and the common Asparagus. Zetterstedt records 

 that it is especially found near the coast, and on such localities are 

 Stæger's specimens taken, as also those from Frederikshavn; this 

 occurrence, Verrall thinks, may be due to the presence of Asparagus 

 here. The larva was taken on Vesterfælled (also a shore-locality) in 

 flood refuse in late autumn; the imago developed in spring (Schlick). 



Geographical distribution : — Northern and middle Europe, and, 

 as it seems, down into Austria and Hungary, and also recorded from 

 Italy and Spain; towards the north to middle Sweden. 



4. S. Loewii Zett. 



1843. Zett. Dipt. Scand. II, 774, 9 et 1855. XII, 4662, 9. — 1907. Kat. 

 palåarkt. Dipt. III, 74. — Melithreptus formosus Egg. 1859. Verh. zool. bot. 

 Geseli. Wien, IX, 406. — 1862. Schin. F. A. I, 317. 



Male. Vertex large, elongated triangular, corisiderably longer than 

 the ey e-suture; it is æneous, somewhat shining; frons and epistoma 

 yellow, the latter somewhat whitish pruinose, the central knob shining, 

 a little brownish; the front mouth edge much m.ore retreating than 

 in the other species, and hence the central knob looking more pro- 

 minent and the front end of the lateral mouth edge lying more back- 

 wards. Jowls whitish yellow. Vertex with yellow hairs, anteriorly 

 somewhat brownish; frons and epistoma pale-haired. Occiput grey 

 pruinose, the hairs white below, yellow upwards, about the middle 

 somewhat coarse and silvery. Antennæ black, third joint somewhat 

 large. Thorax æneous or greenish æneous, shining, without stripes; 

 the yellow marginal line abbreviated at the wing-root, postalar callus 

 yellowish; thorax with yellow, not long hairs, longest behind. Scutel- 

 lum dark yellow or brownish orange, just the basal margin bluish; 

 it is yellow-haired. Pleura bluish æneous, shining; the yellow spots 

 somewhat restricted as, besides the spots above front coxæ, on the 



