Eristalis. 439 



sometimes only below and here sometimes in the whole length. Wings 

 hyaline. Stigma small but a little longer than broad, black. Squamulæ 

 and their fringes yellow or pale yellow, and balteres of the same colour. 



Female. Vertex and frons broad, widening downwards; the 

 vertical space shining black, becoming diiU anteriorly, the frons is 

 dark in the middle, only whitish pruinose at the sides, it is shining 

 above the antennæ; the hairs are black behind, yellow in front, 

 varying so that sometimes the black, at other times the yellow hairs 

 are most extended. Scutellum with only few black hairs. Abdominal 

 spots sometimes as large as in the male but generally smaller, often 

 obscured, third segment without spots; the hairs black except at the 

 base and on the fifth segment. Hind femora generally yellow to the 

 middle or beyond it and hind tarsi with the pale basal part clear yellow; 

 the posterior tarsi may have the base of third joint yellow; the legs 

 are quite yellow-haired. Wings with a fascia below the stigma about 

 as in the male of horticola, sometimes broader. 



Length 11—13,5 mm. 



Remarks : This species is nearest allied to E. rupium but it is 

 evidently distinct by the pale basal part of hind femora, the clear 

 wings in the male and much smaller wing blotch in the female and 

 the shorter stigma, besides by other characters. — It is with some 

 hesitation I detetermine it as vitripennis Strobl, the sole species besides 

 rupium and alpinus with pale base of hind tarsi; Strobl's specimens 

 seem to have the tarsi more pale, and he gives the stigma as longer 

 than in horticola, which is not the case with my specimens, but he 

 is seen to have had only few specimens, and I think the differences 

 are of no consequence. Lichtwardt (Ent. Mitteil. III, 1914, 278) is of 

 opinion that piceus Fall. is distinct from rupium, but if so the present 

 species cannot, however, be piceus on account of the clearer wings, 

 paler hind femora and black-haired vertex. 



E. vitripennis is not common in Denmark; Ordrup Mose, Erme- 

 lund, Lyngby Mose, Geel Skov, Tyvekrog, Tisvilde ; in Jutland in Nør- 

 holm Skov at Varde, Grejsdal at Vejle, Laurberg south of Randers, 

 Hald near Viborg and Rebbild near Skørping. My dates are^Vs— ^^/t; 

 it was for the first time taken in 1907. 



Geographical distribution : — The species is at present only known 

 from Denmark and Styria, no doubt it has been confused with aUied 

 species and will prove to have a much wider range. 



14. E. rupium Fabr. 



1805. Fabr. Syst. Antl. 241, 38. — 1822. Meig. Syst. Beschr. III, 397, 

 19, Tab. XXXII, Fig. 22. — 1862. Schin. F. A. I, 335. — 1901. VeiT. 



