518 Syrphidae. 



hairs on the anterior side, on the posterior side the hairs mainly 

 black and long, the siiort iiairs on the apical part black ; the hairs on 

 anterior tibiæ pale except below middle tibiæ and to a slight degree 

 below front tibiæ, where they are black; hind tibiæ black-haired, below 

 they have a sharp edge on the basal third, the rest bears a somewhat 

 short, erect ciliation. Wings more or less, sometimes somewhat strongly 

 brownish tinged, generally the most on the apical part; medial cross- 

 vein less oblique than in the other species and placed near the middle 

 of the discai cell. Stigma brown. Squamulæ whitish with yellow 

 margin and fringes. Balteres pale yellow. 



Female. Vertex and frons somewhat narrow, widening down- 

 wards, black and shining; frons with two greyish white dust spots; 

 the hairs short and pale, the space above the antennæ bare. Epistoma 

 much more thinly pruinose than in the male. Thorax more short- 

 haired and more black-haired, as the hairs on the front part and 

 along the middle are mainly black and likewise inwards to the wing- 

 root; the long hairs on the postalar calli partly black; scutellum with 

 more or fewer black hairs, and the long marginal hairs black and 

 stronger than in the male. Abdomen with the basal part of fourth 

 segment red. Hind femora quite as in the male. 



Length 11 — 13,5 mm. 



This species is easily known already by its quite black legs. 



X. lenta is not rare in Denmark, but, however, much less common 

 than segnis; Ordrup Mose, Ermelund, Dyrehaven, Geel Skov, Hillerød, 

 Tisvilde, Nordskoven at Jægerspris; on Møen; on Falster; on Lolland 

 in Dødemose west of Nysted, and on Langeland at Lohals; in Jutland 

 at Horsens and at Funder near Silkeborg. My dates are ^"^/a — ^'^/t. It 

 occurs on similar localities as segnis. 



Geographical distribution : — Europe down into Italy ; towards the 

 north to middle Sweden. 



Remarks : Under X. pigra Zetterstedt says (Dipt. Scand. II, 878) 

 "In Dania, D. Stæger"; according to this expression Zetterstedt had 

 evidently not seen Danish specimens ; in Stæger's coUection is a single 

 female, labelled pigra, but it is only a (somewhat immature) specimen 

 of lenta; X. pigra is thus hitherto not found in Denmark. 



5. X. femorata L. 



1758. Linn. Syst. Nat. X, 595 et 1767. XII, 2, 988, 58 et 1761. Fn. 

 Suec. 1824 (Musca). — 1816. Fall. Dipt. Suec. Syrph. 11, 8 (Milesia). — 

 1843. Zetl. Dipt. Scand. Il, 876, 10. — 1862. Schin. F. A. 1, 355. — 1907. 

 Kat. palåarkt. Dipt. 111, 128. — Syrphus volvulus Fabr. 1794. Ent. Syst. IV, 

 295, 62 et 1805. Syst. Antl. 192, 15 {Milesia). — X. volvulus 1822. Meig. 

 Syst. Beschr. III, 223, 16, Tab. XXVIII, Fig. 29. 



