Syrphus. 321 



rather narrow, much narrower than in cinctellus. Vertex and frons 

 with the hairs varying from yellow to black; epistoma with the hairs 

 yellow. or more or less black at the sides. Occiput whitish grey 

 pruinose, the hairs white below, yellow upwards and there are gener- 

 ally no black hairs. Eyes bare. Antennæ short, yellow to somewhat 



Fig. 127. Anlenna of S. cinctus (S, from the inside. X 60. 



brownish, and sometimes the basal joints blackish; third joint short, 

 almost circular ; arista shorter than in cinctellus, as long as the antennæ, 

 apparently bare. Thorax æneous or more or less bright brass-coloured, 

 sometimes somewhat greenish; it is brightly shining; in pale specimens 

 it is distinctly yellowish at the sides; the præsutural depression not 

 pruinose; the thorax is clothed with yellow or reddish yellow hairs, 

 longest behind. Scutellum yellow, sometimes rather dark, a little 

 æneous, with long, yellow hairs, in dark specimens sometimes a few 

 black intermingled. Pleura with yellow hairs. Abdomen narrow, 

 parallel-sided but not specially long; it is generally narrower than 

 thorax, but sometimes as broad or slightly broader ; it is duU black 

 with the first segment and the apex shining. The yellow markings 

 similar to those in cinctellus^ but the bands generally not or only 

 slightly emarginate, and often relatively broader, occupying more than 

 the half of the segments; the basal spots are smaller and pointed in- 

 wards, and they leave the third of the breadth or more black; the 

 yellow hind margin of the fourth and front margin of the fifth seg- 

 ments form together a third band ; the fifth segment has also generally 

 a yellow hind margin and is sometimes quite yellow. The hairs on 

 abdomen follow partly the ground colour, but they are to a high 

 degree pale on the second segment and are black at the apex; they 

 are long at the sides, longest at the base, they are here yellow, for 

 the rest alternating but there are no or only a couple of black hairs 

 at the hind corners of second segment, and also on third and fourth 

 segments they are often somewhat reduced. Venter yellowish with 



21 



