444 Syrphidae. 



This beautiful and interesting species is at once known by the 

 colour of thorax, the thickened hind femora and the short eye-suture 

 in the male; the female is somewhat similar to the female of rupium 

 but differs among others by the not quite shining abdomen. 



E. alpinus is not rare in Denmark, though not among the most 

 common species; Ordrup Mose, Ermelund, Dyrehaven, Lyngby Mose, 

 Geel Skov, Hareskov, Donse, Tyvekrog, Tisvilde, Jægerspris; on Lol- 

 land at Maribo, Strandby and in Kældskov; in Jutland in Nørholm 

 Skov at Varde, at Silkeborg, Laurberg south of Randers and Skørping. 

 My dates are ^^/s— ^^/s. I have taken it especially on the flowers of 

 Crataegus, It would seem as if this species first in later time has 

 occurred in Denmark or at all events has been more common, it was 

 not known to Stæger and in the old coUection was only one specimen 

 (under rupium), though it may now not uncommonly be taken on the 

 localities where Stæger used to collect. 



Geographical distribution: — Middle Europe down into Austria, 

 Styria and Hungary; it seems to have its northern limit in Denmark, 

 and it is not known from England. 



Remarks : E. lucorum Strobl (Mittheil. Ver. Steierm. XXIX, 187) 

 cannot, as also remarked by Lichtwardt (Ent. Mitteil. III, 1914, 277) 

 be lucorum Meig., which is quite another species, described above; it 

 might perhaps be a dark-legged variety of alpinus, but the more 

 hyaline wings with a longer stigma is not in accordance with this view. 



30. Helopliilus Meig. 



This genus is nearly allied to Eristalis but differs, however, in 

 several important characters. The species are of large to medium or 

 somewhat small size, and the smaller species of a somewhat narrow shape, 

 and they are more yellow marked than the species of Eristalis, and 

 also with pale markings on thorax. The head broader than in Eristalis, 

 considerably broader than high. The eyes are separated in both sexes, 

 only in one palæarctic, but not Danish species {peregrinus, Subg. 

 Mesembrius) they are nearly touching in a point in the male, but in 

 Africa many species of this subgenus occur. The eyes are, however, 

 more broadly separated in the female than in the male; in the latter 

 sex the inner eye-margins are parallel down to the frons, here they 

 form a small angle and then they are widening downwards; in the 

 female they widen evenly from the vertex downwards. Eyes bare; 

 the facets in the male distinctly enlarged on the upper front side 

 towards the angle. The antennæ inserted above the middle on the 

 somewhat, sometimes {Liops) rather strongly protruding frons; they 



