136 Syrphidae. 



wards. Abdomen black or bluish black, densely punctate; it is duUish 

 on the disc of the second and third segments, and it is clothed with 

 short, whitish hairs, longer at tlie sides and at the side margin; on 

 the disc the hairs are dark. Venter black, shining, with pale hairs 



Fig. 60. Antenna of C. nigripes d", from tlie outside. x 75. 



which are longish on second segment. Legs black; pubescence on 

 the posterior femora mainly pale for the rest chietly black; hind 

 femora black setulose beneath; hind metatarsi very slightly thickened. 

 Wings strongly brown or blackish brovvn fumigated, especially at the 

 base and on the anterior part; upper angle at the upper marginal 

 cross-vein somewhat acute. Squamulæ white with a white fringe. 

 Halteres brown with a blackish brown knob. 



Female. Frons of medium breadth, widened downw^ards, slightly 

 trisulcate; it is yellow-haired, but above with partly black hairs and 

 the vertex black-haired. Antennæ slightly larger than in the male. 

 Thorax and abdomen coarsely punctate as in the male; thorax with 

 quite short, depressed hairs which are greyish and black, the latter 

 prevailing, especially in the middle. Abdomen likewise with quite 

 short hairs, only longer at the base of the side margin, they are 

 greyish yellow, but dark on the disc. Hind femora setulose about as 

 in the male. Wings sometimes less tinged than in the male. Halteres 

 yellow. 



Length 7—9 mm. 



This species is distinguished from antiqiia by the coarsely punc- 

 tate thorax and abdomen, the more bluish colour and more white- 

 haired abdomen without black hairs at the basal corners of second 

 segment; also the wings are more strongly tinged. The Danish speci- 

 mens have almost always thorax quite black-haired. 



C. nigripes is not rare in Denmark, but has hitherto only been 

 taken on Sealand, Langeland and Lolland; Charlottenlund, Ordrup 

 Mose, Ermelund, Lyngby Mose, at Fure Sø, Hillerød, Nyraad near 

 Vordingborg; on Langeland at Lohals and on Lolland at Maribo, 



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