208 Syrphidae. 



pairs a little hoary and more transverse than in the male; fifth seg- 

 ment without spots. Anterior legs with femora and basal part of 

 tibiæ yellow, also apex of tibiæ, especially middle tibiæ, yellow; tarsi 

 blackish or brownish; sometimes the legs much paler as the dark 

 parts ara brownish or paler, especially on the anterior legs; the front 

 femora have the peculiar, white hair at the base, but it is straight 

 or almost straigt and small. Squamulæ white. Balteres yellow. 



Length 7—9 mm. 



The pupa is Avhitish, of a length of about 6 mm; it is slightly 

 transversely corrugated and has a short posterior spiracular process. 



This species is in the male sufficiently distinguished by the cha- 

 racters on the front legs and the colom" of the abdominal spots; the 

 female is also easily known by the bluish abdominal spots, yet it may 

 bear no slight resemblance to scutatus when this has the spots some- 

 what hoary, but it is distinguished by the broader frons and epistoma, 

 the much smaller side dust spots and the darker legs, especially by 

 the hind femora being not pale on the basal part, 



P. alhimanus is common in Denmark ; Copenhagen in gardens, 

 Lersø, Vesterfælled, Damhussø, Charlottenlund, Ordrup Mose, Erme- 

 lund. Dyrehaven, Lyngby Mose, Ruderhegn, Birkerød, Tyvekrog, Nord- 

 skoven at Jægerspris; on Lolland at Maribo, Bremersvold, in Døde- 

 mose, Kældskov and at Kærstrup west of Nysted; on Langeland at 

 Lohals ; in Jutland at Horsens, Frijsenborg, Gjerlev near Randers Fjord 

 and Thisted. My dates are ^k — ^^h. It occurs in fens and on meadows 

 in grass and low herbage, and not rarely on salt marshes. I found 

 the pupa in a garden under old leaves on ^^/4, it developed in the 

 first part of May, and the species was bred from larvæ in flood 

 refuse in Ruderhegn and at Randers, the imagines developing in 

 May (Schlick). 



Geographical distribution: — All Europe, towards the north to 

 northern Sweden, in Finland, Siberia and on the Faroe islands and 

 Iceland: it also occurs in North America. 



6. P. scambus Stæg. 



1843. Stæg. Naturh. Tidsskr. IV, 326. — 1849. Zett. Dipt. Scand. VIII, 

 3147, 51—52 et 1859. XIII, 6002, 51—52 {Scaeva). - 1901. Verr. Brit. 

 Fl. VIII, 248, 9, fig. 246. — 1907. Kat. palåarkt. Dipt. III, 45. — Scaeva 

 dypeatap.p. 1838. Zett. Ins. Lapp. 606, 31 et 1843. Dipt. Scand. II, 748,51. 



Male. Frons and epistoma greenish black, somewhat densely yel- 

 lowish brown pruinose, most thinly on frons; the central knob not 

 pruinose, but not or slightly shining; vertex yellow-haired, only just 

 at the apex some black hairs; frons black-haired. Epistoma with 



