522 Syrphidae. 



Feniale. Similar; vertex and frons rather narrow, widening down- 

 wards, bluish; frons with two greyish dust spots; the hairs short, 

 yellow, the space above the antennæ bare. Abdonien as in the male, 

 the small fifth segment black, shining and black-haired. Hind troch- 

 anters with indications of the proeesses present in the male. 



Length 11 to fully 15 mm. 



X sylvarum is somewhat common in Denmark; Ordrup Mose, 

 Ermelund, Dyrehaven, Bøllemosen, Ørholm, Hillerød, Egebæks Vang, 

 Nyrup Hegn, Tisvilde, Faxe Ladeplads, Jægerspris; on Falster; on 

 Lolland at Maribo and in Kældskov; on Langeland at Lohals; on 

 Funen at Veflinge, Odense and at Lundeborg on the eastern coast; 

 in Jutland at Horsens, Rye near Silkeborg and Sæby. My dates are 

 3/6 — 2^/8. It occurs on similar localities as segnis and is often seen on 

 piants with large leaves as Petasites. 



Geographical distribution: — Europe down into Italy; towards 

 the north to middle Sweden, and in Finland. 



7. X. nemorum Fabr. 



1805. Syst. Antl. 192, 17 (Milesia). — 1862. Schin. F. A. I, 356. — 

 1901. Verr. Brit. Fl. VIII, 604, 5, fig. 413. — 1907. Kat. palåarkt. Dipt. III, 

 129. — X.hifasciata Meig. 1822. Syst. Beschr. III, 219, 10. — X. florum 

 Zett. (nec Meig.) 1843. Dipt. Scand. II, 879, 13. — Milesia ignava 1816. 

 Fall. (nec Panz.) Dipt. Suec. Syrph. 11, 16. 



Male. Vertex black or æneous black, not specially long; frons and 

 epistoma grey pruinose, the former shining at the extreme front margin ; 

 vertex with yellow, anteriorly with black hairs, frons a little pale- 

 haired and epistoma with distinct, whitish hairs at the eye-margins. 

 Occiput greyish pruinose, less above; the hairs yellow, above a few 

 black hairs. Antennæ blackish or blackish brown; arista of medium 

 length, black. Thorax greenish æneous, shining, often with indications 

 of two darker middle stripes; it is greyish pruinose on and inwards 

 to the humeri; it is fmely punctate and clothed with short, erect, 

 yellow or whitish and black hairs ; the hairs are black especially across 

 the middle, and behind are longer, black hairs among the short ; above 

 the wing-root are short, black hairs. Scutellum with short, yellow and 

 long, partly black hairs; the long marginal hairs yellow, not bristly. 

 Pleura with shortish, yellow hairs, just above some black hairs, Ab- 

 donien somewhat short, dull black, with yellow spots; the first seg- 

 ment æneous and shining and the fourth shining; second segment has 

 two transversely quadrate, yellow spots a little before the middle, and 

 third segment a similar pair nearer the front margin; the spots are 

 somewhat shining; they are either isolated from the sides or reaching 



