Syrphus. 317 



the markings go more or less widely over the side margins, but are 

 sometimes isolated; the fourth segment has a yellow hind margin, the 

 fifth is quite yellow or with a triangular, black spot. The hairs on 

 abdomen are short ; they are mainly yellow but black just at the hind 

 margins of second and third segments, and there are also some black 

 hairs along the middle, and fourth and fifth segments are almost quite 

 black-haired ; at the sides the hairs are longer, longest at the base,- 

 they are here yellow, for the rest alternating yellow and black. Venter 

 pale yellow with more or less distinct, dark, longitudinal middle spots 

 on the segments ; it has long, pale hairs, on fourth segment also short, 

 black hairs. Genitalia not large, reddish, eighth segment with a black 

 spot behind and ninth segment partly black; the hairs black. Legs 

 somewhat long and slender, yellow, anterior tarsi darkened towards 

 the end, hind tarsi brownish or blackish. The hairs on the legs yel- 

 low, black only on the apical half on the anterior side of hind femora 

 and all round the tip, and nearly all on the hind tibiæ, which latter 

 have a distinct antero-dorsal fringe. Wings a little brownish tinged. 

 Squamulæ yellowish white with yellow margin and fringes. Halteres 

 yellow. 



Female. Frons and epistoma narrow; vertex and frons yellowish 

 pruinose, vertical triangle a little æneous and from here an æneous 

 middle stripe stretches down to a bare spot above the antennæ, which 

 spot is yellow, a little æneous above; the hairs black. Thorax with 

 the stripes generally more distinct than in the male. Pleura more 

 whitish pruinose, with white hairs. Abdomen as in the male, the 

 black hind margins of the segments sometimes broader. Legs as in 

 the male. 



Length 9,5 — 11 mm. 



The larva is described as smooth, dirty whitish, with some stripes 

 at the sides posteriorly; the length is 12 mm. The puparium is whitish, 

 with more or less distinct, greyish or brownish triangles on the dor- 

 sum ; it is rather attenuated behind and has here a delicate side-brim ; 

 the length is fuUy 7 mm. 



This species cannot be confounded with any other as it has no 

 ally in Europe ; in Ghina, India, Borneo, South America and Australia 

 very nearly allied and very similar species occur. — The types, a 

 male and female, to S. nectareus Fabr. are present in the collection 

 of Tonder Lund, and I have examined them. 



S. halteatus is a very common species in Denmark and occurs all 

 over the country on all localities, also very commonly in gardens; it 

 is generally seen hovering about bushes. My dates are '^/t — ^''/lo, it is 

 thus a late occurring species. Larvæ and pupæ are often met with; 



