Flatychirus. 213 



The larva is flat below, somewhat arched above, greyish yellow 

 with some darker longitudinal lines; tlie pupa is white, 5 mm long, 

 slightly transversely corrugated; it has a short, brown posterior spir- 

 acular process, divided at the apex. 



This species is much like P. scamhus but in the male it is easily 

 reeognised, especially by the presence of the peculiar, white hair at 

 the base of front femora and the much more yellow abdomen; also 

 the female is distinguished with certainty from the female of scamhus 

 by the white hair at the base of front femora, and further by the 

 shorter antennæ with short arista and the smaller abdominal spots, 

 especially the basal pair. — According to Zetterstedt (1. c. VIII, 3149, 

 Obs. 2) Stæger has first observed that this species is different from 

 fulviventris (ferrugitiea), and as Zetterstedt says "Stæg. in litt." the 

 name is originally due to Stæger. — Under P. podagratus Zetterstedt 

 says, that this species had been taken at Copenhagen by Stæger; this 

 is certainly erroneous, I think it is a confusion with the present species. 



P. immarginatus is somewhat rare in Denmark; Utterslev Mose, 

 Amager, Vesterfælled, and in Jutland at Horsens and Randers. The 

 dates are ^''/s— ^''/s. It occurs on meadows, perhaps especially on salt 

 marshes. I found the larva on Vesterfælled in flood refuse, chiefly 

 consisting of reeds, near the shore on ^U, it pupated soon after and 

 the imago came in the first half of May; it has further been bred 

 from larvæ in flood refuse in Utterslev Mose and at Randers, the 

 imagines developing in April and May (Schlick). 



Geographical distribution : — Northern and middle Europe, towards 

 the north to northern Sweden, and on the Faroe Islands; it is recorded 

 from northern Germany by Zetterstedt, further down into Styria 

 {podagratus Strobl), but the records are not sure as the species has 

 not been well reeognised. 



8. P. fulviventris Macq. 



1827. Macq. Soc. Se. Lille, 229,6 et 1834. Suit å Buff. I, 548, 47, c? 

 (Syrphus). — 1838. Melg. Syst. Beschr. VII, 136, 112 (Sijrphus). — 1843. 

 Zett. Dipt. Scand. II, 750, 53 et 1849. VIII, 3150, 53 (Scaeva). — 1843. 

 Stæg. Naturh. Tidsskr. IV, 325. — 1862. Schin. F. A. I, 296. — 1901. 

 Verr. Brit. FL VIII, 288, 11, fig. 248. — 1907. Kat. palåarkt. Dipt. III, 43. — 

 Musca mellina 1776. De G. (nec Linn.) Ins. VI, 117. — Syrphus ferruginevs 

 Macq. 1827. 1. c. 229, 7 et 1834. 1. c. I, 548, 48, ?. — 1838. Meig. 1. c. 

 VII, 137, 113. — Scaeva ferruginea 1843. Zett. 1. c. II, 749, 52 p.p. et 

 1849. VIII, 3148,52. — Syrphus Winthemi Meig. 1830. 1. c. VI, 353, 100. 



Male. Frons and epistoina greenish black, the former slightly 

 pruinose, the latter not densely greyish yellow pruinose with the 



