134 



Syrphidae. 



Fig. 58. Head of C. antiqua d. 



Male. Eyes bare. Frons somewhat shining, with a longitudinal 

 groove. Frons and vertex black-haired, Epistoma much hoUowed 

 below the antennæ, the central knob large and prominent, slightly 



compressed; epistoma only slightly de- 

 scending; it is greyish pruinose below 

 the antennæ, for the rest only very 

 slightly pruinose. Eye-margins some- 

 what broad, grey pruinose, with short, 

 pale hairs. Occiput and jowls greyish 

 pruinose, with yellow hairs below, blaek 

 above. Antennæ not large, black, third 

 joint squarely roundish, not longer than 

 broad; arista somewhat long, thickened 

 in the basal part, short-pubescent. 

 Thorax black, shining, fmely and not 

 densely punctate; it is clothed with 

 not long, erect, blackish hairs, longest 

 anteriorly; scutellar marginal bristles distinct, but fine and rather long, 

 notopleural and postalar bristles also distinct, but the supraalars in- 

 conspicuous. Pleura with longish, black hairs. Abdomen black, fmely 

 and sparsely punctate, nearly all shining, only somewhat duU on the 

 disc of first and second segments and just on the middle line of the 

 third; it is clothed with short, yellow hairs which become longer at 

 the sides; in the middle line the hairs are more or less dark, and 

 also sometimes at the hind margins of the last segments; at the basal 

 corners of the second segment is a tuft of long, black hairs. Venter 

 black, shining, with pale hairs. Legs all black; the hairs on posterior 

 femora more or less pale, otherwise the pubescence mainly dark, ex- 

 cept the usual reddish pubescence on the front and hind tibiæ and 

 tarsi. Hind femora fmely black spinulose beneath; hind metatarsus 

 slightly thickened. Wings brownish tinged at the base and towards 

 the anterior margin; upper marginal cross-vein almost straight, and 

 the upper angle acute. Squamulæ whitish yellow, with a yellow 

 fringe. Halteres yellow, the knob often more or less brownish. 



Female. Frons of medium breadth, widened downwards, trisulcate 

 with the middle furrow distinct; it is short yellow-haired, at the vertex 

 some black hairs. Antennæ very slightly larger than in the male. 

 Thorax shining, with short, somewhat erect, yellow hairs. Abdomen 

 sliining, with quite short, depressed, yellow hairs. Hind femora only 

 setulose towards apex. Wings generally a little more brownish yellow 

 tinged. Halteres orange. 

 Length 7—8 mm. 



I 



