452 Syrphidae. 



scutelluni with more black hairs on the middle, sometimes the whole 

 disc black-haired. Abdomen less elongate and less narrow, and the 

 segments with dark orange hind margins, broad and palest on second 

 segment; the spots on second segment as in trivittatus but confluent 

 with the orange hind margin and consequently confluent with the 

 spots on third segment; on second segment there is thus onl)^ a trans- 

 verse black basal spot, prolonged backwards in a middle line not 

 reaching the hind margin; the spots on third segment likewise as in 

 trivittatus and also with grey or greyish yellow, somewhat pruinose 

 spots on the inner corners, nearly meeting in the middle ; at the sides 

 the spots reach to the hind margin; the spots on fourth segment are 

 more brownish yellow and form large and broad, somewhat pruinose 

 lunules, curving from the side evenly inwards and quite or nearly meeting 

 in the middle, and they occupy most of the segment; the side margin of 

 the segment is yellow. The genitalia are densely haired with curious, 

 curled or woolly, yellow hairs. Legs coloured about as in trivittatus, 

 hind femora with a more or less complete and obscure, reddish ring 

 just before the apex ; front tibiæ with the apical part black and front 

 tarsi black; middle tarsi with apex of second joint and the folio wing 

 apical joints black; hind femora with the thickest part after the middle: 

 the legs haired as in trivittatus but front femora more or less black- 

 haired behind, especialiy towards the apex, and middle femora with 

 numerous short, black bristles below in the apical half; hind tibiæ 

 with short, erect, black bristles below. 



Female. Likewise similar to the female of trivittatus but the 

 vertex less black, only quite posteriorly; the hairs black behind, yel- 

 low in front, but varying in extent, sometimes all black. On abdomen 

 the hind margins to the segments are very obscure and the one on 

 second segment not broad as in the male and not confluent with the 

 spots so that there is a black margin in front of it; the spots on 

 third segment narrower than in the male and not close to the front 

 margin; the bands or very shallow lunules of fourth segment are for 

 the greater part yellow, only greyish or brownish yellow and some- 

 what pruinose on their inner tip or on the tip half, or this colour 

 may border the yellow colour out to the margin so that only the 

 basal inner part is yellow; fifth segment with a pair of brownish yel- 

 low, somewat pruinose lunules; this latter segment has short, black 

 hairs on the apical part as in trivittatus, but a little longer. 



Length l!2,5— 14 mm. 



H. hyhridm is rare in Denmark ; at Copenhagen, Amager, Ordrup 

 Mose, Ermelund, Dyrehaven, Lyngby Mose (the author), Søllerød 

 (Godskesen); on Lolland at Bremersvold, in Kældskov, Egholm Skov 



I 



