354 Syrphidae. 



it has likewise pairs of triangular or more elongated oblique spots at 

 the sides, smallest on second segment and increasing in size back- 

 wards; the side margin is yellovv; the sixth and seventh segments 

 yellow with a more or less triangular, black middle spot. The spots 

 may vary in size, being more or less widely separated, or the hinder 

 ones almost touching. Legs yellow, hind femora with a faint ring 

 near the base and anterior femora with only an indistinct pateh. 



Length 7,5 — 8,5 mm. 



This species is at once known both by its black antennæ and 

 the retreating front mouth edge, and by the abdominal markings; it 

 seems to vary rather much with regard to these latter according to 

 Zetterstedt's and Schiner's descriptions, especially Schiner describes 

 the abdomen in the male with the third and following segments yellow 

 with indistinct brown markings, and in the female with yellow bands 

 of which only the first is interrupted, and the last segment quite 

 yellovv. 



S. Loewii is very rare in Denmark, we have only four specimens, 

 taken many years ago at Lersøen in June by Stæger; it is recorded 

 to occur at the horders of water on water-plants, according to Schiner 

 especially on Butomus umbellatus; Zetterstedt records it also from 

 the shore on Scirpus and Triglochin. 



Geographical distribution: — Northern and middle Europe down 

 into Austria; towards the north to middle Sweden. 



2L Xantliogpamma Schin. 



Species of medium size and of black colour with yellow stripes 

 on thorax and markings on pleura, and with yellow, band-shaped 

 spots on abdomen. The genus is nearest allied to Sphaerophoria, 

 but at once distinguished by its broader shape. Head semiglobular, 

 a little broader than thorax, excavated behind. Eyes touching in the 

 male, separated in the female, but the vertex rather narrow. Frons 

 somewhat protruding, the upper angle in the male acute. Eyes not 

 quite bare, with scattered, inconspicuous hairs; the upper facets in 

 the male slightly enlarged. Antennæ inserted in the middle or nearly 

 so; they are short, third joint roundish, the basal joints not quite 

 small; arista somewhat short, apparently bare; the antennæ are larger 

 in the female than in the male. Epistoma not broad, more or less 

 narrowing downwards; it is a little hollowed below the antennæ, the 

 central knob not small, but not much protruding; the front mouth 

 edge considerably retreating and almost not curved upwards; the 

 epistoma is yellow and hairy. Jowls very narrow, and not at all 



