Syrphus. 283 



the antennæ. Thorax dark æneous or bluish, shining, with yellow 

 hairs. The usual two grey stripes on the middle in front sometimes 

 somewhat distinctly visible. Scutellum yellowish to brownish, pellucid, 

 somewhat bluish æneous; it has long, black or brownish black hairs. 

 Pleura with yellow or pale yellow hairs. Abdomen dull black with the 

 apex shining; it has three pairs of yellow or whitish yellow lunules, placed 

 and shaped about as in venustus, but they are generally more lunulate and 

 with the inner end nearer the front margin than the outer end; they are all 

 well isolated from the side margin ; the fourth and fifth segments have the 

 hind margins pale, but often somewhat indistinctly, and the fifth segment 

 has pale spots at the basal corners. The hairs foUow mainly the ground 

 colour; at the sides they are long, and they are here yellow at the basal 

 corners and on the front part of the segments and thus alternating 

 black and yellow. Venter coloured about as in venustus and with 

 long, yellow hairs. Genitalia somewhat large, black, with black and 

 yellow hairs. Legs yellow with about the basal half of anterior 

 femora and the hind femora except the apex blackish ; the hind tibiæ 

 have a dark ring in the middle or they are quite blackish except the 

 base; front tarsi and the three last joints of middle tarsi darkened 

 and hind tarsi blackish. The hairs on femora quite or almost quite 

 yellow, and likewise the short hairs on tibiæ except above the hind 

 tibiæ, and these latter with a dark fringe on the antero-dorsal side, 

 the hairs of which are somewhat longish and strong about the middle. 

 Wings hyaline or slightly tinged. Squamulæ whitish with yellow margin 

 and fringe. Halteres pale yellow. 



Female. Frons broad, bluish black, black-haired, with large, yel- 

 lowish side dust spois, uniting in the middle and thus forming a curved 

 band. Abdomen more shining than in the male, the lunules nearer 

 the front margin of the segments. 



Length 8 — 9,-5 mm. 



De Geer mentions (1. c.) the larva of his Musca pinastri, which 

 species may, as explained below, be identical Avith the present species; 

 the larva has soft spines, is greyish yellow with darker designs, about 

 11 mm long, and is, I think, somewhat similar to the larva of /S. a/6o- 

 striatus; it was taken among Aphides on Pinus, it pupated on ^*/9, 

 and the imago came next spring on =^^74. 



Remarks: Zctterstedt mentions (VIII, 3142) that Stæger had sent 

 him a single specimen of S. obsc-unis, taken at Copenhagen; this 

 specimen we have not in our collection, but it belonged no doubt to 

 the present species, for in our general collection we have two speci- 

 mens named obscurus, one labelled Lapponia, the other Suecia, both 

 sent from Zetterstedt, and they are both lunulatus; the specimens do 



