120 Syrphidae. 



more steep tlian in solstitialis, and with a more distinct lower angle. 

 Plumula dark yellowish. Squamulæ smoky with a brown margin and 

 a dark yellow fringe. Halteres with yellow peduncle and brown 

 knob. 



Female. Frons and epistoma broad, much broader than in solsti- 

 tialis; frons æneous black, shining, with a more or less depressed 

 middle space and at each side a number of often somewhat vague, 

 oblique cross-furrows ; epistoma without central knob and with the 

 mouth edge less produced than in solstitialis; it is grey pruinose on 

 the whole upper half. Vertex with few, short hairs and frons still 

 less hairy. Antennæ a little longer than in the male. Thorax æneous, 

 shining, rather coarsely punctate, with exceedingly short, dark hairs 

 and with a few longer, pale hairs which seem to be easily rubbed, 

 but in in the præsutural depression there are always long, yellow 

 hairs, which is not the case in solstitialis. Abdomen with the æneous 

 side parts broader than in the male but less shining. Wings gener- 

 ally a little less darkened, with the upper marginal cross-vein a little 

 steeper. Squamulæ whitish. Halleres with the knob paler brown. 



Length fully G to about 8 mm. 



Also of this species specimens occur with the abdomen more or 

 less brownish. 



This species resembles solstitialis, but is distinguished by many 

 characters, thus besides by the broad frons and epistoma, the colour 

 of the wings and the yellow wing-base also by the quite different 

 hairiness of the thorax and the grey pruinose spots on the pleura, as 

 well as by the colour of thorax and the course of the upper marginal 

 cross-vein in the male. 



Remarks: Loew thinks (Wien. ent. Monatschr. I, 1857, 6) that 

 Zetterstedt has described the male of basalis Loew as chalyheata, I 

 think chiefly because Zetterstedt says: "alis disco macula fusca", but 

 this expression may well be used about chalyheata., and I think it 

 beyond doubt that Zetterstedt has not had basalis and that this species 

 does not occur neither in Sweden nor in Denmark. 



C. chalyheata is common in Denmark; Ordrup Mose, Ermelund, 

 Dyrehaven, Donse, Hillerød, Grib Skov, Rørvig, Jægerspris; on Lolland 

 at Strandby, Kærstrup and in Dødemose west of Nysted; on Funen at 

 Middelfart; in Jutland in Nørholm Skov at Varde, at Horsens, Nebs- 

 ager near Horsens, Laven near Silkeborg, Gjerlev near Randers Fjord 

 and Rebbild near Skørping. My dates are ^li—^^ls. It occurs on the 

 same localities as solstitialis. 



Geographical distribution:— Europe down into Spain and Italy; 

 towards the north to middle Sweden and in Finland. 



